Until the middle of the moon, the tung oil lamp has burned out.

The room was dimly lit.

Zhang Jian slowly stood up and picked up the money bag on the ground.

The beautifully crafted money bag itself is worth a lot of money, and only a gentleman like Du He can afford to use it.

Zhang Jian pursed his lips, opened it, and counted it, and there were more than 500 yuan in it.

Suddenly, his mouth opened wide in surprise.

After a while, Zhang Jian suddenly felt overjoyed, and then rushed out of the house like crazy: "Mother's illness is saved, hahaha......"

In the moonlight, his running figure was a little staggering.

Not long after, Zhang Jian came to a pharmacy in the workshop and slammed the door open.

"Shopkeeper, hurry up and get me medicine, I have 500 yuan now."

……

On this day, when Du He was about to take a nap, someone suddenly arrived in the palace.

The person who came was none other than Ximen Qing.

As soon as Ximen Qing saw Du He, he was extremely enthusiastic: "I have seen Lantian County, but I haven't seen it for a few days, and the county looks like it has grown a lot taller." ”

Du He said with a smile: "I haven't seen you for a few days, and the head manager of Ximen is getting better and better, so I haven't picked up the money." ”

Ximen Qing laughed: "The county said that it was funny, I came here today on the order of His Majesty to get the method of making explosives, Your Majesty said that the county is young, but I am afraid that after a long time, you will forget, so let me personally come to the door to remind you, if you are not ready, our family will go back to report to Your Majesty, and say that the county you have been working hard for several days, and you have no time to prepare, so you will come to pick it up another day." ”

This Ximen Qing is a good person, and before he knew it, he stood on Du He's side in a few words, whether it was true or not, but it sounded comfortable.

Du He waved his hand: "It's impossible to let Mr. Simon run you for nothing, you wait a while, and I will write down the method of making this explosive for you to take back." ”

As he spoke, he asked the old man to greet Ximen Qing, and Du He returned to the room.

Sitting down at the table, Du He spread out the paper, picked up the pen, and began to write.

In the quiet room, there was only the sound of the tip of a pen scratching across the paper.

After a short time, Du He put down his pen, picked up the two pages that were full of writing, and said with satisfaction: "It's done!" ”

The title is "On How Explosives Are Made", the first part introduces in detail the method of making gunpowder and the principle of combustion, and the second part introduces the explosion principle of explosives packets and the method of making explosives.

If this is put in the future life, a high school student can figure it out.

However, in this era, such an article can be described as of supreme value.

To put it simply, this article deserves the title of a prince of Lantian County.

When Du He returned to the living room, he handed the article to Ximenqing, only to hear Ximenqing say: "Ouch, the county is really talented, don't say anything else, just this handwriting, Your Majesty is often full of praise, such an excellent young talent as the county, it is rare in the world." ”

Duhe sounds numb, but it's very useful.

After Ximen Qing carefully put away his things, he quietly stuffed a piece of silver into Ximen Qing's hand.

Ximen Qing smiled and leaned into Du He's ear, and whispered: "The county doesn't know, after you had dinner in the Wende Hall that day, Your Majesty and the queen praised you, and the queen even felt that it was a pity to be a colt with your talent!" ”

Du He's heart moved, and asked, "What is Your Majesty's attitude towards my frolicking with Princess Changle?" ”

Ximen Qing whispered: "Your Majesty didn't say anything, it should be lifeless." If there is any news in the future, we will definitely send a letter to the county, hehe......"

Du He nodded: "There is Chief Labor." ”

Ximen Qing left satisfied.

Du He looked at the back of Ximen Qing leaving, and a bold idea suddenly appeared in his heart, but he immediately shook his head and vetoed it.

This idea is too bold, once Li Er finds out, it is estimated that the matter of marrying two princesses will be in vain.

Besides, Ximen Qing brought the article "On How Explosives Are Made" back to the palace, Li Er looked at it casually, and called Yuan Libin, the young eunuch of the Shaofu, over.

At the beginning of the establishment of the Tang Dynasty, the weapons supervisor was set up to take charge of the creation of weapons, but with the decrease in the war, the weapons supervisor was abolished in the sixth year of Zhenguan and merged into the Shaofu Prison.

Yuan Libin is a young eunuch of the Shaofu Prison, an official from the sixth grade.

Li Er handed the article to Yuan Libin and said, "I will give you three days to make an explosives bag and put it out, and I will personally come to the scene to review it at that time." ”

Yuan Libin hurriedly said: "Please put it down, I will do our best to make the explosives package." ”

What happened by the lake in Dongneiyuan that day, Yuan Libin's official position was too small to see it with his own eyes, but when he heard the people around him, he was shocked.

Now that he had the idea of making explosives, he was excited.

I heard Li Er say again: "This law is the dedication of Duhe, the son of Lantian County, all those involved in this matter must be kept secret, if anyone leaks the news, the nine clans will be punished." ”

One sentence scared Yuan Libin's face white.

Yuan Libin returned to the Shaofu Prison with this article "On How Explosives Are Made", and first studied alone for a few hours behind closed doors, but he was confused.

It turns out that although Du He's article is written in the vernacular, it is full of professional terms, and later generations don't feel anything when they read it, but the people of this era are a little sleepy.

For example, the word lead made Yuan Libin scratch his ears and cheeks, and he didn't understand it for a long time.

In the end, Yuan Libin had no choice but to call the two deputies of the Shaofu Supervision Ordnance Department to consult them in detail, and only then did they understand a little.

A deputy said: "My lord, this Lantian County, really a god, can come up with such a method, according to the subordinates, the principle of making this explosive, we don't understand it, we still honestly follow the method to experiment, as for the principle, I'm afraid that only Lantian County can understand it in this world." ”

Yuan Libin nodded thoughtfully: "That's right, we only need to make explosives, as for why it can be exploded, it's not for us to care about it." ”

Immediately, Yuan Libin arranged a few henchmen and began to develop explosives.

……

Three days later.

Li Er sent Zhao Yang to the Laiguo Mansion to invite Du He to the palace to watch the experiment of the explosive package developed by the Shaofu Supervision and Ordnance Administration, but Du He refused with a mouthful.

Du He only said one sentence: "There is a guy named Nobel, who blew up his whole family because of playing with gunpowder, and this kind of thing is not going to experiment with explosives bags!" ”

Waiting for Zhao Yang to bring the words to Li Er, Li Er disagreed: "Hmph, this kid, alarmist, he dislikes the title I gave him is too small, and he is dissatisfied, but my explosives have been successfully made, see what else he can do!" He's just dissatisfied, and it's too late! “

As soon as he thought of Du He's upset, Li Er felt that he was in a happy mood.

……

(One more, Yuan Libin appeared!) ）