A simple trick subdued these Taoist priests, but Yang Heng didn't let them continue to work, he still needed them to study chemistry, if they were tired, then how could they study something else.

"Ladies and gentlemen, now I will give you a task, that is, you go to those old farmers now, and what do you want you to do, which is to mix your turmeric extract, or the liquid you put on paper, with the soil in each field, and then write down their color changes."

What is this for, in fact, Yang Heng wants to use the simplest method to identify the pH of some land, although it will not be very accurate, but it can also roughly distinguish what kind of crops are planted in what kind of soil, and Yang Heng plans to transport some soil from the outside in the future, and also plant crops in these soils, this is a long-term project, but after the trouble of these Taoist priests, Yang Heng was inspired, and he wanted to let scientific planting appear in advance.

"Xiao Langjun, what turmeric, what paper, we don't know what to do?" A few Taoist priests began to pretend to be confused, this is their eating guy, they naturally won't admit it.

"Why, you don't plan to die until the Yellow River, right, you forgot the hand of Da Qingfeng, right?" Who is Da Qingfeng, naturally it is the hot Taoist priest, it is also strange, these Taoist priests are called Qingfeng Mingyue more, and there are fewer other names, there are two Qingfeng among the five Taoist priests, two Mingyue, it seems that they also followed the master to learn so many hands and began to come out to swagger and deceive, if it is the old Taoist, basically this name is not willing to mention.

These two breezes. Two bright moons. Yang Heng didn't want to waste time. Naturally, they are called Da Qingfeng, Xiao Qingfeng, Da Mingyue, Xiao Mingyue, and what is the name of the other, which is also a star.

"We know the way, we know the way, we just do it." Several Taoist priests said helplessly. This made Yang Heng grasp the handle, first of all, they didn't even know what it was and what could put their hands into the hot oil pot, so naturally they didn't dare to compete with Yang Heng in other aspects, not to mention what other moves they had, or to go up the knife mountain and down to the sea of fire.

Not to mention, if these Taoist priests don't agree, Yang Heng will really give them a Shangdao Mountain, at this time, there is Shangdao Mountain, and these Taoist priests may not know the Dao. Even those who know how to understand the truth may not be able to understand the truth. Going into the sea of fire is also the same, and these are all scary, simple, and can be done with a little preparation, but unfortunately they didn't give Yang Heng this opportunity.

So these Taoist masters did not develop gunpowder, but first developed the pH of the soil.

As for the research of steel, Yang Heng has nothing to say, as long as the workers do a good job of the chimney first, and then they can produce samples, after the samples come out, Yang Heng will take them outside, and use a hydrodynamic grinding wheel to identify the steel flowers of these steels, and there will be some things, and then compare the hardness, Yang Heng doesn't know what steel is what steel is this steel, but the forty-fifth steel he used more in his previous life, so he remembers it more clearly.

A few days later, Yang Heng found that he had nothing to do here in the valley, the blast furnace of steel, and the houses for making gunpowder, were all under construction, especially these places needed to be rested, that is, the stones had to be leveled first, and then the construction could begin, and the old farmer had nothing to do, the seeds had already been planted, just waiting for flowering, pollination, and even grafting.

When Yang Heng came out, he found that Changle, Yu Zhang, and Xiao Niang and others had been waiting for him here for a few days. "Lang Jun, why did you come out, my father asked you to send a message to let you enter the palace, it has been a few days, and the concubine has listened to you, if there is nothing important, don't go inside to call you, I asked my father's messenger, and he said that he was not in a hurry, so he didn't call you." Changle is now infatuated with Yang Heng, and he dared to put Li Er's messenger aside, and waited for Yang Heng to come out, if Yang Heng had been in there all the time, would he keep letting the messenger wait.

"Brother-in-law, I don't know what my father told you to do, could it be that I went to the garden to break that vine and was discovered by my father." When did Yu Zhang become so timid, isn't it just a grapevine, Yang Heng thought, even if Yu Zhang burned the entire garden, Li Er would not frown, could it be that he was frightened by the last time Xiao Niang, this is Li Er's sin.

"Brother Heng, Uncle Emperor called you, it won't be for the last time, I'm so afraid." "Okay, okay, don't worry, it's estimated that it's in the mountains that your majesty knows about it, there's nothing to do, it's just that your majesty is curious, and your majesty is just looking for me to ask." Yang Heng said very casually, what Yang Heng did not keep from Li Er, at this time Li Er called him, naturally for the matter of going to the oil pot. This is very easy to say, as long as it is demonstrated once, it is just to popularize chemical knowledge for Li Er.

In the worried eyes of everyone, Yang Heng followed the messenger on the road very chicly.

"Sister-in-law, Brother Heng will be fine." When something happened to her own people, Xiaoniang suddenly lost her mind, and she was very worried about Yang Heng, which is also human nature, and it is normal to lose her mind for her relatives, and this is often the case when accidents occur.

"Little sister who has nothing to do, didn't you listen to what your brother Heng said, he knows what Lu Dao is, otherwise, I'll go and inquire." "Okay, I'll go with you too." So the second wave of people who entered the palace also appeared, that is, Changle, Yuzhang and Xiaoniang. However, their worries are superfluous, now it is too late for Li Er to protect Yang Heng First of all, just studying the grain seeds makes Li Er happy, what political achievements can be more successful than increasing the income of the people, naturally there will be things that increase in grain production and lead to lower food prices, and there will be things like cheap food hurting farmers, but this will always be better than starving to death, when the food is cheap to a certain point, the imperial court disaster relief will be much easier.

Sure enough, Li Er was concerned about Yang Heng's matter about the fried imp, "Let's talk about it, what's going on with your fried imp, don't fool me into saying that there really is a little ghost." "Your Majesty, I was about to tell you this, or else, Your Majesty, you would have someone bring you a pot, then a bucket of vinegar, and then a bucket of soybean oil."

There is no explanation clearly, only practice is the right reason, so Yang Heng decided to show Li Er on the spot, saving him from being suspicious, although he was very calm, but Yang Heng obviously felt that Li Er was shocking him, and Li Er was still a little panicked in his heart.

"Your Majesty, you see this is vinegar, come on, light the fire below." As he spoke, Yang Heng poured the vinegar into the pot and there was half a pot, and the fire didn't burn for long, and the vinegar boiled and boiled.

"Your Majesty, you see, there is nothing to put my hand in, naturally this needs training, but the minister is born in iron, and it is heat-resistant, or a guard, you put your hand in, it doesn't matter, the fire below has been withdrawn, otherwise, you stick a finger into it." Yang Heng casually pulled over a palace guard, this guard was very scared, this, boiling things, can he really put his hand down, he just didn't dare to let go.

"Come here, you." Yang Heng didn't wait for Li Er to speak, he directly pulled the guard and even hugged him horizontally, grabbed one of his hands, and put it directly into the hot vinegar.

"Ah......" A scream shook the sky, "What is your name, look at your hands, aren't they still good." As he spoke, Yang Heng then gave him a hand with water.

"Ha Luha, Ha Luha, my hand is still there, my hand is fine, ah, Your Majesty, the minister is rude." As he spoke, the guard knelt down directly, and even trembled in fright, "Okay, okay, you get up, don't make a fuss in the future, I won't give you any hardship, I didn't see my colt have anything to do, look at what scares you, isn't it hot vinegar." As he spoke, Li Er even wanted to put his hand in the vinegar.

"Father, what are you going to do?" (To be continued......)

PS: (This one has this statement, it has not been verified, please do not imitate.) ）