In Li Yuanjia's view, things like quilts must wait until November to come in handy.

So he won't make the same mistake as before, giving the quilt out when it's not hot, and then letting it be put away. Then when winter arrives and the weather is cold, I take out the silk cotton quilt that works, and this quilt is the career of pressing the bottom of the box!

But......

"The key is the land...... No, it should be said to be productivity! ”

Sitting in his study, Li Yuanjia took a charcoal pen to write and draw on white paper, and his eyes gradually narrowed.

The real future of cotton will definitely not lie in the court!

Whether it is the emperor, the nobles of the harem, or even the ministers in the court, I am afraid that they will not be so concerned about cotton. Because they have silk wool that represents comfort, and they have fur fur that represents luxury, cotton doesn't mean much to them.

It should be ordinary people who really need it.

Only the poor who do everything they can to keep them warm for the winter, or the ordinary people who have to keep warm with layers of linen, need something as soft and warm as cotton.

Unfortunately, cotton production requires land.

In this era of low productivity, land is the most valuable resource, and it is difficult for Li Yuanjia to imagine how he should convince those aristocratic lords to let them use some of their precious land to grow cotton instead of growing food.

Food, clothing, shelter and transportation, don't look at clothing is in front of food, but the first element of survival is still food, as long as you don't freeze to death, don't you just wear it?

As for the occasional freezing death of a few poor ghosts in the cold winter wax moon, who cares?

Otherwise, cotton is such a good thing, why does it have to wait until after the establishment of the Ming Dynasty for Zhu Yuanzhang to use coercive means to popularize it throughout the country?

Therefore, only when grain production goes up, can there be room for cotton planting.

It's just that in these years, how easy is it to increase grain production? Even if Li Yuanjia came up with a very mature Quyuan plow, how much is the popularity rate of Datang now? Ten percent? Or twenty percent? There are also new dumpers and cylinder trucks that can improve the irrigation rate, and I am afraid that the time to spread all over the world is ten or one hundred years.

Moreover, the development of agriculture is naturally not just relying on two new tools, otherwise the Quyuan plough and the cylinder car both appeared in the Tang Dynasty, how much has changed?

Thinking about it, Li Yuanjia was helpless.

"There's no way, I can only take one step at a time."

Finally, he dropped the charcoal pen on the white paper, and Li Yuanjia's gaze gradually became deeper: "Papermaking, movable type printing, glass, curved plows, overturns, cylinder cars, and of course, Arabic numerals, etc., can do as much as you want, in short, as long as you don't live in vain in this life...... Well, speaking of which, the first two volumes of "Mathematics" should be printed soon, and it will be better to throw them into the Xinhua bookstore to test the water. ”

Li Yuanjia's daily troubles and powerlessness did not affect the normal operation of the world too much.

However, under his urging, Li Zhong's side quickly opened the printing of the first and second volumes of "Mathematics" - because the engraving had been done, Li Zhong and the others also figured out the process of engraving printing, and the printing speed of the two books was very fast, and they could soon complete the task of 300 copies each.

The two newly printed books, Li Yuanjia is ready to let them quietly appear on the shelves of Xinhua Bookstore.

To be honest, I don't have much confidence for the time being.

After all, mathematics is really "useless" for most people in these years, and only a small number of people, such as the bookkeeper, or some people in charge of statistics in the yamen can make it. But if they are willing to learn, another problem arises, which is that it only makes sense for them to use Arabic numerals if they use them themselves!

It's like the household department counts the world's money and grain, and the subordinate states and counties send traditional writing, just they know that Arabic numerals are simple and convenient to use. The little time saved is not enough for the time spent on switching between each other!

Not to mention that if you want to use those formulas, you must use horizontal rows, which challenges the bottom line of readers even more.

Don't think that people who read books are very popular, even in the eclectic and inclusive Datang, it is very dangerous to rashly change their inherent concepts. That is, the subject of mathematics is relatively not so important, if it is replaced by something else......

So, hype is a must.

Quietly put it in the Xinhua bookstore, first test the water on a small scale, and then wait until the conditions are ripe to think about large-scale promotion. As for when the conditions are ripe, Li Yuanjia decided to go slowly and take a look slowly.

"How can the many traverser seniors in it be so easy to do all that?"

Thinking of these annoying things, Li Yuanjia felt that his head hurt.

Just take out the movable type printing invented in the Song Dynasty casually, and replace the engraving that will be used for thousands of years in the future? If you make a few cotton clothes out of cotton, you can get the emperor to help promote it with all his might? Arabic numerals or something are super killers, as soon as they come out, they can subdue the civil and military forces of the Manchu Dynasty, and instantly become a master of mathematics......

It's really time for Li Yuanjia to cross, and it's hard to build a rollover!

Don't look at the status of craftsmen, but whether they are blacksmiths or carpenters, they are all "high-tech talents"! If ordinary people want to do this, they must first be apprentices to craftsmen for a few years, that is, free labor that suffers from fatigue, before they can learn real skills, and with the existing carpenters in Datang, why did these wooden machinery with complex structures quickly popularize?

!

The slender charcoal pen turned quickly in his hand, and Li Yuanjia's mind didn't know how many thoughts turned for a moment, and finally converged on one sentence.

The world is bustling, all for profit; The world is crowded, all for profit.

The word profit is fundamental!

This sentence from Chapter 129 of the "Historical Records" "The Biography of the Goods and Colonies" is the eternal truth for thousands of years!

Is the cost of movable type printing too high and too difficult to use? Then let Li Zhong and them improve it to replace engraving printing. Can't look down on Arabic numerals, can't get used to horizontal text? Then let the literati see the benefits of using it in this way! Think cotton isn't worth the effort? Then let the people of the world eat first, and then have the surplus money to buy cotton clothes and quilts, the landlords and merchants of the world will naturally think about planting cotton and then selling it to these people......

"So, how do you do that?"

Thinking of the crux of the matter, the charcoal in Li Yuanjia's hand finally stopped.

A blank face.