Seeing that Li Xiu suddenly stopped when he talked about the most important role of saltpeter, Li Chengdao, who was itching, couldn't help but ask: "Sir, what is the most important role of saltpeter?" ”

"This ......" Li Xiu hesitated again at this time, and finally suddenly had an idea, "I won't talk about the most important role of saltpeter, I'll treat it as a subject and leave it to you to study by yourself, and see who can discover it first!" ”

It is no exaggeration to say that it is precisely the emergence of gunpowder that makes the war from cold weapons to hot weapons confrontation, and also lays the foundation for the modern war in later generations, but Li Xiu still has some doubts about the emergence of gunpowder. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ

First, Datang has just stabilized at home and abroad, and there will not be any big war for the time being, so even if gunpowder appears, it doesn't seem to be of much use, and secondly, he is worried that if the formula of gunpowder spreads out, or even falls into the hands of those with ulterior motives, it may be used by these people, so that the originally stable situation of Datang will change uncontrollably, plus he doesn't want to take too much credit, so as not to be targeted by Li Yuan, so it is better for gunpowder not to appear for the time being.

"Li Saijiu, can this method of making ice from saltpeter be promoted, so that the people of my Datang can eat a piece of ice food in the scorching heat?" Princess Pingyang said excitedly at this time, no wonder Li Xiu said just now that he could have as much ice as he wanted, with a way to make ice, I am afraid that there will be no need to worry about running out of ice in the future.

"Hehe, it's just a small road, and it's nothing to promote, but in this way, I'm afraid that the price of saltpeter will skyrocket, so the princess should buy more saltpeter back these days, otherwise it will be difficult to buy in the future." Li Xiu smiled indifferently, he was not short of money, and saltpeter ice making could also improve people's quality of life, so he naturally wouldn't stop it.

"This is a problem, now that the weather is so hot, the amount of saltpeter must be very large, and you must also need Li sacrificial wine at home, and there is still a summer to pass, it seems that you need to buy more." Princess Pingyang couldn't help but say to herself when she heard this, saltpeter was only used to dye cloth and cure diseases, so its output was not high, but now that the effect of ice making is discovered, the price will definitely skyrocket, and I am afraid that money will not be able to buy it at that time.

"You don't have to buy too much, saltpeter can actually be reused, such as the ice made of saltpeter in front of you, and then dry or boil it after the ice melts, you can get saltpeter again." At this time, Li Xiu smiled again and said the advantages of saltpeter ice.

"Great, in this way, the amount of saltpeter used will be greatly reduced, and ordinary people should be able to afford it!" Princess Pingyang couldn't help but shout happily when she heard this, and even she had already begun to think about taking out all the ice in the ice cellar at home and giving it to her subordinates.

"Brother, the pot is completely frozen, can you make it into ice food?" At this time, Qi Niang blinked and asked Li Xiu with a pair of big eyes, she had been staring at the ice since just now, and she imagined in her mind that she would not be short of ice food all summer.

"You can't eat the ice with saltpeter in it, if you want to eat clean ice, you have to take a small basin and put it in this big basin, put clean water in it, and wait until the water in it freezes, you can take it and eat it." Li Xiu shook his head and smiled when he heard Qi Niang's words.

"Oh~" Qi Niang was very disappointed when she heard this, in fact, she really wanted to taste what the ice made by her brother tasted like?

Seeing Qi Niang's disappointed look, Li Xiu couldn't help but smile, asked her to wait a while, and then went to get some ice chisel brought by Li Chengdao, and added cream, and sprinkled some chopped fruits, and as a result, a fruit ice cream that was almost no different from the later generations was ready.

When Li Xiu brought the ice cream to the living room, Princess Pingyang and the others all had bright eyes, and they were also praised after tasting it, and even Li Chengdao, who didn't like sweets very much, ate a big bowl, and also asked Li Xiu for the method of making it, saying that he would make it for his younger brothers and sisters after he went back.

The weather is hot, and it is really not suitable to go out, so Li Xiu and they stayed in the living room for a whole day, and the ice in the ice basin was changed one after another, and the car of ice pulled by Li Chengdao was only enough for one day, as for the ice pulled by Princess Pingyang, it was really divided by Li Xiu, and all the people in the family were given a large piece of ice, so that they no longer had to worry about the heat and couldn't sleep at night, this kind of treatment even the helmet and others around Princess Pingyang were very red-eyed, but after tomorrow, they would also live this cool life.

That night, Li Xiu and everyone in the family had a rare good night's sleep, but on this night, there was a cavalry from the south to the north, rushing in the direction of Chang'an, the first person was Li Shimin, because the battle of Tuyuhun had been decided, and there were naturally other people to deal with it next, so Li Shimin rushed back to Chang'an, and the reason why he hurried at night was naturally to avoid the heat during the day.

Seeing that Chang'an was in front of him, Li Shimin's face also showed a little smile, during this time he worked Tuyuhun's side, and finally defeated the other party, which is also after Yang Guang, once again defeated Tuyuhun, you must know that Tuyuhun's strength is no worse than Goguryeo in the northeast, and such a big military feat is enough for Li Shimin to pull a game, proving that his military talent is by no means comparable to his eldest brother Li Jiancheng.

However, although this battle proved Li Shimin's military talent, he couldn't stay outside for too long, after all, if he left the political center of Chang'an for a long time, God knows what would happen, so as soon as the war ended, Li Shimin immediately rushed back.

"Your Highness, we are less than ten miles away from Chang'an, why don't you take a rest first, and then send someone to inform the city, so that Your Majesty can arrange someone to greet you!" At this time, I saw Li Shimin rushing out of the road parallel to him, and this person was Li Shimin's most relied on strategist Sun Wuji.

"No need, let's go directly to Chang'an City, and then call to open the city gate and enter the palace, I want to see my father as soon as possible and report to him the battle in Tuyuhun in person!" Li Shimin said excitedly, at this time, he was more eager than ever to see his father.

Seeing Li Shimin's excited appearance, the eldest grandson Wuji couldn't help but sigh secretly, I'm afraid that only he will understand Li Shimin's mind in this world, just some time ago, they suddenly received a message from the court, and His Majesty suddenly increased the number of his own reviews and folds, so that the power in the hands of the prince was also reduced, which made Li Shimin think that his military exploits in Tuyuhun had played a role, making Li Yuan begin to favor him, so he was in a hurry to enter the palace.

However, compared to Li Shimin's excitement, as an outsider, the eldest grandson Wuji felt that this matter was a little strange, and it was not necessarily a signal that His Majesty began to favor Li Shimin, so he also advised Li Shimin not to be happy too early, so as not to rejoice in the air, but unfortunately Li Shimin, who was full of joy, couldn't listen to it at all, which also made the eldest grandson Wuji very helpless.

In fact, Changsun Wuji's intuition was correct, but he and Li Shimin would never have dreamed that the reason why Li Yuan increased the amount of review was only because Li Xiu gave him a pair of reading glasses, which alleviated his eye disease, which made Li Yuan feel like he was much younger, so he withdrew some power.

The journey of ten miles is coming in a flash, when Li Shimin and his party came to the city gate, there was already a touch of fish belly white in the east, and it was not yet the time to open the city gate, but after Li Shimin revealed his identity, the guards on the city gate naturally did not dare to slack off, and immediately opened the city gate in person to let them in, and then Li Shimin did not even take off his armor, and rushed directly to the palace.

Li Yuan's mood is also very good during this time, since Princess Pingyang gave him reading glasses, he no longer has to worry about not being able to see clearly, and several of his favorite concubines in the palace are pregnant at the same time, it is estimated that by next spring, he will have several more princes or princesses.

The mood is good, the whole person feels different, these days Li Yuan gets up early every day, and then rides his old war horse to run a few laps, this war horse has followed him since he started the army in Taiyuan, and he will ride it every time he goes to the battlefield, but after becoming the emperor, he and it have no chance to go to the battlefield again, and this horse is already old, and he can't go to the battlefield at all, at most, he usually humps him and trots a few laps.

However, just as Li Yuan got off the horse and then took a towel to wipe his face, he suddenly saw the chamberlain trotting forward and reporting: "Your Majesty, His Royal Highness King Qin has returned, and he is now waiting in the Liangyi Palace!" ”

Hearing that his second son came back so soon, Li Yuan couldn't help but be stunned, and then immediately asked people to drive the Liangyi Palace, and when he walked into the main hall, he saw Li Shimin, who was dressed in armor, standing in the hall, and when he saw him come in, he immediately bowed down and saluted: "Son, see your father!" ”

"Haha, Erlang, you don't have to be polite, you did a good job of Tuyuhun this time, and the civil and military forces of the Manchu Dynasty are praising you for your good behavior!" Li Yuan saw Li Shimin also laughed loudly, the most proud thing in his life is that he has two capable sons, but the most distressing thing is the same, because there is only one seat, and sometimes even he doesn't know how to choose?

"Thank you for your father's praise, and the son is just doing his duty!" Li Shimin was modest, but the corners of his mouth couldn't help but smile a little, he was praised by his father, and then thought of the power that his father had withdrawn from the hands of his eldest brother before, which also made him more sure that his weight in his father's heart was likely to have surpassed that of his eldest brother.

Next, Li Shimin began to report to Li Yuanyu about the war in Tuyuhun, and took out a notebook and handed it over, which recorded in detail the casualties of the battle, as well as the consumption of materials, and so on. Li Yuan took the fold and habitually picked up the glasses next to him and put them on, and then watched the fold while listening to Li Shimin's report.

Li Shimin was greatly surprised when he saw the glasses on Li Yuan's face, and couldn't help asking, "Father, what are you wearing on your face?" ”

"Hehe, this is called reading glasses, it was given to me by your third sister, you also know that your father has an eye disease, and it used to be difficult to see the fold, but this reading glasses has alleviated the eye disease of the father, and now you don't have to worry about not being able to read the words on the fold." Li Yuan said very happily.

When Li Shimin heard this, he was like being struck by lightning, and the expression on his face froze suddenly, as if he understood something, and Li Yuan said that the glasses were given to him by Princess Pingyang, which also made him immediately think of a person, and he couldn't help but grit his teeth in his heart and said secretly: "Li Xiu, you bastard!" (To be continued.) )