Night blindness is a disease that is very rare in the 21st century.

However, in ancient times, due to the limitations of living conditions, it was more common especially among civilians. In addition to retinal lesions and congenital genetic diseases, the most important cause of this disease is the lack of vitamin A.

.

In other words, most people's night blindness can be solved by eating.

And speaking of it, it’s not particularly difficult to find something to eat. Things rich in vitamin A are relatively common, such as apples... things called nai in ancient times, such as crucian carp, carrots, and animal livers.

Wait, it's not really anything valuable.

But the things that people will take for granted in the future are also good things these days.

For example, although the high-ranking officials do not like to eat the offal of animals, and even regard it as a despicable thing, it is not something that the poor can eat. Anyway, as far as Li Yuanjia knows, in this country, which is praised by many historians as

During the "Reign of Zhenguan", many people did not even have enough to eat coarse grains all year round. What else could you expect?

So this disease is said to be easy to cure, but it is very difficult to do it!

Think about it, just in the last few months of the twelfth year of Zhenguan, how many rebellions occurred in the Tang Dynasty? If the people could have enough food and warm clothes, who would rebel with them?

But for Li Yuanjia, these are not things he has to worry about.

Then there is such an opportunity, he can come up with the method of treating night blindness and tell the people of the Tang Dynasty how to do it. As for whether they can do it and how well they do it, that is Li Shimin's business. With "Wu Zhuangyuan Su"

According to the words of Mr. Xing in "Beggars", it is not him who determines the size of the beggar gang, but the emperor...

The only thing Li Yuanjia has to worry about is how to come up with this method!

So he needed Han Lucheng to count the number of people with night blindness in his house and several villages, and then use "a medical book he had read" as an excuse to do experiments on these people. Eat pork liver, sheep liver, chicken liver, etc.

Once eaten, take carrots and crucian carp as a supplement.

Afraid that he would forget about it when he went back, Li Yuanjia told Han Lucheng in advance. And once these people in the family were cured, night blindness could be recorded in the medical history of King Han...

After taking more than ten minutes to finish the hot breakfast, Han Lucheng and others who had been waiting nearby immediately swarmed over and began to put clothes on Li Yuanjia one by one.

Although he was very impatient in his heart, Li Yuanjia could only endure it at this time and act like a clothes shower.

The name of the country of etiquette is no joke.

In the future, there will always be some people on the Internet who say that nobility needs knowledge, and almost praise the old nobles in Europe to the sky. One of the reasons includes their etiquette, clothing, castles, etc., but after coming to the Tang Dynasty,

Li Yuanjia discovered that the ancestors had no idea how rich their background was in this area!

Forget about etiquette, just a piece of clothing can give him a headache!

Not to mention what he likes or dislikes, there are more than a dozen types of princely costumes listed in the laws of the Tang Dynasty. Each type has strict regulations and is suitable for different occasions. For example, going to the mausoleum today

When worshiping the late emperor, you must not wear the wrong clothes, and there must be no stains or obvious wrinkles on the clothes, otherwise Li Yuanjia will be waiting to be played by the censors!

Anyway, in this era, disgrace is also one of the major crimes, and serious cases can lead to dismissal from office.

So when he put on layers of princely clothes, put on heavy hats, and arranged every part of his body neatly, it was already two sticks of incense later. Li Yuanjia shook his head, which was a little heavy.

He breathed a sigh of relief and told Han Lucheng: "I'm afraid it will take a long time to go there today. I'll make a pot of mutton soup in the afternoon and send some to Liang Guogong in the evening to help them get rid of the cold!"

"Yes, Your Majesty."

"Oh, by the way, whenever someone comes to ask about a four-wheeled carriage, just tell them directly that it can be done, but it will take a long time. If you want it, book it in advance!"

"...Yes, I understand."

…

Watching the king's carriage leave, Han Lucheng stood at the door for a moment and narrowed his eyes slightly.

Of course he understood what the king just said.

Because just yesterday, two groups of people came to him secretly and asked about the four-wheeled carriage. But at that time, he didn't know what the king meant, so he didn't dare to say more. Later, he reported the matter to the king.

.

Now listening to the meaning of the king's words, do you plan to agree to them?

Subconsciously frowning, Han Lucheng was a little confused about the king's thoughts. The carriage was originally a big thing, and it was more troublesome to make than overturning it. Especially for a big man like Lu Guogong, where was the carriage he was riding in?

So easy to make? Just the carved patterns and various details on it take a lot of effort.

Moreover, the four-wheeled carriage itself is much more troublesome to make than the two-wheeled one.

There are only a few carpenters such as Chen Mu in the mansion who can make this thing. If there are really many people who want it, wouldn't they have nothing to do all year round?

"Could it be that……"

Suddenly thinking of a possibility, Han Lucheng frowned: "Does the king want to build a workshop specifically to build four-wheeled carriages like the cartwheel workshop outside the city? But... such a workshop besides the house, tools

In addition, it requires a lot of manpower and costs a lot of money! Is it worth it just to build a few carriages?"

After much thought, Han Lucheng couldn't figure it out. In the end, he could only helplessly shake his head and sighed secretly: "If this is really the case, there will be more and more workshops outside the city, and those people won't know it by then.

What would you say..."

…

"It shouldn't be too troublesome to build a carriage factory."

Listening to the squeaking sound of the carriage's wheels, Li Yuanjia secretly calculated: "There must not be many people using it in the early days, and if you want to control the flowers, two carpenters and a few apprentices will be enough. But if you want to build a

The manufacturing assembly line of a four-wheeled carriage is not something that can be easily realized. It requires a considerable investment of manpower, material resources and financial resources, at least... one-third of that of a rollover workshop?"

"No, a quarter or even a fifth is enough!"

Li Yuanjia opened the thick curtains next to him and looked at the muddy ground outside, and then listened to the voices of countless people and horses around him. He couldn't help but reveal a wry smile: "For the powerful people in Chang'an City, the carriage factory was built like this.
Chapter completed!