This question is not easy to answer, and it is not good to say yes or no. Therefore, when Li Shimin asked, no one was angry at first, and they all counted on others to take the lead.

Finally, Tang Jian, the secretary of the Ministry of Rites, spoke, and he said: "What Lord Wei Zheng said is indeed a problem. The minister basically agreed. However, there were many slaves in the courtier's family, and many of them were bought. And if there are those you don't like, the minister will sell them.

This situation is not only in the family of the minister, but also in the family of the person with the title. ”

"yes. This is also the case in the minister's house. Cheng Yanjin said.

Then, many nobles chimed in.

Wei Zheng's family did not have this situation, and he also ignored the situation in the families of other imperial court nobles. He froze for a moment,

Li Su also ignored this stubble, and now, he also felt a headache.

At this time, Ma Zhou, the new director of the State Administration of Taxation, came out to speak. He said: "Your Majesty, the minister has an idea. Can you define the object of Lord Wei's human trafficking to civilians?

In this way, those who buy and sell untouchables are not guilty, and those who buy and sell commoners are guilty. ”

Li Su's eyes lit up, and he felt that this was a workaround, although it could not completely ban human trafficking, but it was always a step forward in the fight against human trafficking.

Li Su said: "Father, the son thinks that Lord Ma's opinion is more appropriate. I wonder what Lord Wei thinks? As he spoke, he gave Wei Zheng a look.

Although Wei Zheng was stubborn, he was not stupid, and he also felt that his original proposition would not work, so he accepted Ma Zhou's opinion. He said: "Master Ma is reasonable, and the minister agrees with his opinion. ”

Li Shimin asked: "What do you think of Ma Zhou's opinion?" ”

Unexpectedly, most of the ministers were silent, and it seemed that everyone did not approve of it.

Li Su suddenly understood a truth - in the feudal era, people's concept of hierarchy was deep-rooted, and court officials and nobles despised commoners and lowly people from the bottom of their hearts. The pursuit of privilege is also the motivation of soldiers and officials to climb the ladder desperately.

Li Su saw that the situation was wrong, so he said to Wei Zheng: "Lord Wei, this matter, or we will discuss it later?" ”

Wei Zheng still wants to fight for it. He was just about to speak, Li Shimin said: "The prince's proposal is very good, let's discuss this matter later." ”

This incident was the first time that Li Su's proposal was not adopted after he came to the Tang Dynasty.

After the dispersal of the dynasty, Wei Zheng saw that Li Su was a little wilted, and said with a smile: "Your Highness, this is nothing, the ministers have made a lot of suggestions, and I don't know how many times I have been beaten back, it's too normal." Not this time, let's find another chance in the future. ”

Seeing Wei Zheng's optimistic appearance, Li Su suddenly felt that he was a little stingy. He also laughed and said, "You're right, this is a piece of." Let's go, sit down with me, and have two drinks together at noon. ”

Datang is making progress, and the whole society is developing in a good direction.

The days were dull and peaceful.

On this day, Cheng Chumo came and brought a few boxes.

Li Su opened it and glanced at it, and said, "Carry the box and follow me to the Taiji Palace." He walked to the door. Stopped, thought for a moment and said, "Forget it, don't go." ”

Li Su called the princesses, explained to them, and then went out.

50 minutes later, Li Su accompanied Li Shimin and Li Jing to the East Palace.

In a side hall of the East Palace, a stepped booth was arranged, covered with red flannel cloth, on which various glass crafts of different colors were placed. Surrounded by more than a dozen horse lanterns, the glass reflected is crystal clear and dazzling, making people feel as if they have entered a fairyland.

Those who have seen glass products for the first time are amazed at how clear and smooth it is. Li Shimin and Li Jing also had this expression now, they were dumbfounded and speechless for a long time.

Li Su introduced them to the situation of glass production.

Eight months ago, on the banks of the White Horse River at the foot of the Qinling Mountains in Hu County, Gyeonggi Province, west of Chang'an City, Li Su, together with Li Shimin, Li Xiaogong, Hou Junji and others, built a glass factory.

The main raw materials of glass are: silica sand (sandstone), soda ash, feldspar, dolomite, limestone, and miscanthus salt. In modern times, there are glass manufacturers in this location.

Process: 1. Raw material crushing: crushing the above raw materials into powder; 2. Weighing: weigh a certain amount of various powders according to the planned batching list; 3. Mixing: mix and stir the weighed powder into a batch (add colorant to the colored glass at the same time); 4. Melting: The batch is sent to the glass melting furnace and melted into molten glass at 1700 degrees; 5. Moulding: The molten glass is made into flat glass, bottles and cans, utensils, bulbs, glass tubes, and phosphor screens with corresponding molding devices...... 6. Annealing: send all kinds of formed glass products to the annealing kiln for annealing, balance the stress, and prevent self-breaking and self-cracking.

Judging from the above production process, this technology is not complicated. After repeated experiments, the craftsmen finally mastered the production process.

Li Shimin did not shy away from Li Jing about the secret of the glass factory, because Li Su gave his shares to Li Jing Bancheng in order to thank Li Jing for his consistent support.

Li Shimin and Li Jing observed various handicrafts of glass and expressed their admiration from time to time.

Li Jing was most interested in three of them. They are a lantern, a telescope, and a compass.

In order to test the effect of the horse lantern, Li Su ordered the doors and windows to be closed and the thick curtains closed. Then the lantern was lit.

Li Jing took the horse lantern and shone around, and said: "Your Majesty, this is a good thing, it is bright, windproof and easy to carry, and the army should be equipped with a lot of equipment." ”

For telescopes, they were already familiar with them, and they began to be interested in the compass.

In the Tang Dynasty, people had already invented the compass car, and the principle is the same as that of the compass. However, it is very bulky. The purpose of a compass requires two big men to push a guide cart to achieve.

The compass now placed in front of Li Shimin and Li Jing is only the size of a palm, and it is also engraved with a secret position (the military divides 360 degrees into 360 parts, each part is a secret position), which is convenient for measuring azimuth and ranging measurement.

Li Shimin and Li Jing each held a compass and played with it for a long time, full of praise.

Soon, they came to Li Su's study.

Li Shimin asked, "What are you going to do with these glasses?" ”

Li Su said: "Erchen believes that horse lanterns, binoculars and compass should be produced in large quantities and equipped with troops.

Produce a large number of ordinary flat glass, which is used to replace the doors and windows of imperial palaces, noble mansions, institutions, factories, and schools. Improve office and living conditions.

As for the handicrafts, they are not sold internally in Datang for the time being, except for a small amount left to your father and emperor for rewarding heroes, all of them are used for foreign trade.

The Ministry of Commerce and the Overseas Intelligence Bureau are responsible for selling to countries around Datang. We exchange these glasses, which have no real value, for their gold, silver, copper, iron, grain, cattle and horses, and other strategic materials.

In this way, it can not only add a lot of wealth to the imperial court, but also, to a large extent, weaken or even drag down the economies of neighboring countries.

The weaker the surrounding countries, the safer Datang will be. This is economic warfare. ”

Then, Li Su popularized the principles of economic warfare in later generations to Li Shimin and Li Jing.

Li Shimin and Li Jing nodded frequently when they heard this.

Li Shimin said: "This matter is very important, and you have to be personally responsible. ”

"The retainers obey." Li Su replied.