Xue Ning'er and Yan Yuru met in school, Zhao Yan thought that there would be a dragon fight between them, but Zhao Yan obviously still didn't know much about women, the kind of conflict he imagined did not explode, after Xue Ning'er saw Yan Yuru, she was very enthusiastic, and pulled her to sit down and chatted very lively, until Zhao Yan started to lecture, they didn't stop.

Originally, Zhao Yan only planned to teach some mathematics courses in the afternoon, but in the end, Xue Ning'er and Ouyang Wanling both objected, after all, they were mainly attracted by Zhao Yan's astronomical and geographical knowledge, and Princess Bao'an, Princess Shoukang, and students such as Ya'er and Zhao Hao also strongly asked Zhao Yan to teach more knowledge other than mathematics.

Seeing this situation, Zhao Yan couldn't refuse again, and finally decided to talk about geography, this time he no longer introduced the earth's 6 places and oceans in general, but chose the main target of the introduction in the South China Sea to the South China Sea of the Great Song Dynasty, starting from the customs of Taiwan Island, and going to Java and even farther Australia 6.

For example, although Taiwan Island has not been officially included in the territory of the Great Song Dynasty, many Song people know that there is a big island outside Fujian, and call it Liuqiu, but they don't know much about the situation on the island, as for the islands and countries in the Nanyang area, although they often trade with the Great Song Dynasty, but the distance and inconvenient transportation make the Great Song Dynasty know less about them, and even can't figure out the location of these islands and countries. Now Zhao Yan talks about the customs of Nanyang with ease, which naturally makes Princess Bao'an and others very fascinated.

In the next period of time, Princess Bao'an, Yan Yuru and others also came to attend classes almost every day, which also made Zhao Yan outside of the usual classes. had to squeeze out half an hour to teach some other courses, and even Cao Ying couldn't resist the temptation in the end, and followed Princess Bao'an and them to listen to the class, but Zhao Yan felt as if he was teaching his wives and concubines.

This morning, Zhao Yangang finished today's class. Just as he was about to let the students out of school, he suddenly heard a rush of footsteps outside, and then he saw a white-faced and long-bearded Taoist burst in with an excited face and said, "Son-in-law, come and see if this thing is available, but it took a lot of effort for us to get it out." ”

It was Cao Ying's grandfather Cao Yan who broke in, but Zhao Yan was very surprised when he saw him, some time ago Zhao Yan wanted to go to Cao Tong's door to learn medical skills. Zhao Yan also agreed, but what he didn't expect was that Cao Tong did not have the Taoist temple he built, according to the Taoist priest in the Taoist temple, Cao Tong seemed to have left in a hurry. Zhao Yan went to look for him twice and didn't see him, but he didn't expect him to come to the school today.

"Grandfather, why are you here?" Seeing Cao Tong come in, Cao Ying, who was sitting there, also stepped forward in surprise and saluted, and Princess Bao'an, Princess Shoukang and others also stepped forward to salute together, and they also respected Cao Tong, the living immortal in folklore.

"Huh? Why are you all here? Cao Tong saw that Cao Ying, Princess Bao'an and others were also there, and even Zhao Yan's younger brother Zhao Yan was also there, which made him very surprised. He had just come back and heard that Zhao Yan was here, so he hurriedly ran over. I didn't expect there to be so many people in this room.

"Hehe, Qiyu grandfather, grandson-in-law is teaching here, and the second sister just happened to come to listen." Zhao Yan also stepped forward with a smile to explain at this time, and then continued to ask, "Grandfather, what did you say just now that you want me to take a look?" ”

Heard Zhao Yan's words. Cao Tong immediately remembered the reason why he came to him today, and wanted to say something with an excited face. However, he looked at Cao Ying and the others with some embarrassment, although Cao Ying and the others were not outsiders. But he felt that the less people knew about it, the better.

Seeing the expression on Cao Yan's face, Cao Tong and the others immediately understood, and Princess Bao'an took the lead in saying goodbye to him at the moment, and finally Zhao Yan winked at Zhao Yan and reminded him not to forget his own affairs. After everyone left, I saw Cao Tong take out a shiny thing from his arms and hand it over: "Son-in-law, take a look, whether this thing is suitable or not, we have spent a lot of effort?" ”

Zhao Yan was also strange in his heart, and when he took it and looked at the things in his hand, he almost screamed in surprise, because what he was holding in his hand turned out to be a convex lens, and the transparency was very high, not only did there be no bubbles in it, but not even a single impurity could be seen, such a high transparency lens can be used as spectacle lenses.

"Where did this come from?" Zhao Yan finally looked at it for a long time, and finally said with a solemn face, he even doubted whether this convex lens was also crossed from the later generations?

"Hehe, this is the glass firing method that our Daomen spent a lot of effort to get, and then concentrated many talents in the door to improve it, and finally made this kind of glass with excellent transparency some time ago, and now grandson-in-law, tell me quickly, with this kind of glass, can we make a microscope?" Cao Tong said with a smug face at the beginning, but when he talked about making the microscope at the end, he became anxious again.

"You...... You haven't even given up on making microscopes? Zhao Yan was also shocked when he heard Cao Tong's words, Cao Yan had asked him how to make a microscope, but Zhao Yan wanted to dispel the other party's idea with the reason that there was no glass with high transparency, but he didn't expect that Cao Yan had not given up, and really got the glass out, although this kind of glass may not meet the requirements of later generations, but it should still be possible to make some microscopes with lower multiples, and it would be easier to make telescopes.

"Hehe, the microscope is so versatile, it allows us to see a whole new world, something so important, as long as there is a silver lining, we will never give up." Cao Tong smiled again at this time, but there was a bit of bitterness in his smile, as if there was something unspeakable.

"By the way, it seems that the method of firing glass has not been transmitted to our Great Song Dynasty, where did you get your Daomen?" Zhao Yan suddenly asked very strangely at this time, in fact, he wanted to ask this question just now.

"This ......" Cao Yan was most worried about Zhao Yan asking this question, and now he also showed a look of embarrassment on his face after hearing it, and finally had to say vaguely, "You don't care about this grandson-in-law, anyway, our Daomen has now mastered the method of firing glass, and even built a workshop in the south, and is preparing to produce some glass products, so that our people in the Great Song Dynasty don't have to buy the glass products shipped by the Hu merchants at a high price." ”

Zhao Yan naturally saw at a glance what Cao Tong was hiding, and asked very curiously: "Grandfather, what else can't we say between us?" You tell me, where did the firing method of glass come from? ”

"This ......" saw that Zhao Yan did not give up asking, the expression on Cao Yan's face was even more embarrassed, and finally suddenly slapped his thigh and said, "That's it, this matter is also a shame of our Daomen, in fact, the firing method of glass is very unbright, when I conveyed this matter to the whole Daomen colleagues, many people are responding positively, and finally a Taoist friend in Guangzhou got the news that there is a big Hu merchant in Guangzhou, mainly doing glass trade, it is said that their family has a large glass workshop in the Persian area, So in this case, the Taoist friend mobilized the local forces, and even used his influence in the government, and finally arrested the Hu merchant, and then forced him to ask for the method of firing glass. ”

Zhao Yan was also stunned when he heard this, he didn't expect Daomen to be so barbaric, as for the fate of that Hu Shang, he didn't need to ask to know, it must be very miserable, even if he didn't die, his family would be ruined, it seemed that the glass firing method of the Great Song Dynasty had been stained with blood.

However, although Zhao Yan thought of the above, he actually did not have any sympathy for the Hu merchant in his heart, especially the other party was still in Guangzhou, you must know that the Great Song Dynasty was relatively relaxed about commerce and maritime trade, coupled with the continuous wars in Central Asia and South Asia, so that many Hu merchants had to flee their hometowns and settle in the Great Song Dynasty, especially in Guangzhou, which was the settlement of Hu merchants, and some Hu merchants settled in the Great Song Dynasty for generations.

Later, when the Mongols swung their troops south to attack Guangzhou, it was those Hu merchants who lived in Guangzhou who colluded with the Mongols, making Guangzhou fall soon, and afterwards they acted as a bully and oppressed the Han people to be the lackeys of the Mongols, so Zhao Yan was very merciful not to go to them for trouble, let alone just take the firing technology of glass from them.

"I see, but how did you improve it, I remember that even if it was the glass shipped by Hu Shang, it wouldn't have such a high transparency?" Zhao Yan asked curiously again at this time, but as for the unsightly means of obtaining glass from the Daomen, he didn't even mention it.

Seeing that Zhao Yan did not pursue the methods used by the Daomen, Cao Yan couldn't help but breathe a sigh of relief, and replied immediately: "Son-in-law, why did you forget, it wasn't you who sued me last time, saying that it was necessary to put lead into the glass to make glass with high transparency, but I have always remembered it, but it failed countless times at the beginning, and then after the improvement of some talents in the Daomen, I finally slowly found a set of feasible methods, and now I can make this glass in large quantities." ”

"Grandfather, your Daomen is really full of talents, and it is not easy to find out the manufacturing method of lead glass with just one sentence from me!" Zhao Yan also praised again when he heard this, but it was normal to think about it, Taoists were already good at alchemy, especially they were very familiar with the highly toxic heavy metals such as lead and mercury, and it was normal for them to be able to make lead glass.

"It's just ......" Zhao Yan suddenly frowned at this time, he understood the principle of the microscope, but with the craftsmanship level of the Great Song Dynasty, could they really make a microscope? (To be continued) R655

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