At this time, Li Ciyu had no choice but to speak, he said: "This telescope was first made by His Majesty the Emperor, first made of bamboo tubes, and then gradually became what it is now, but we don't know what the specific reason is, maybe Mr. Galileo knows better than us. ”

Galileo smiled and said, "The problem in this regard should be that Mr. Dezag is more authoritative than me, or should I ask Mr. Dezag to tell everyone?" I also want to learn better in this area. ”

Dezag was not polite, he directly drew a schematic diagram of the refraction of light, and then began to explain the refractive index of ordinary light, as well as the different refractions of different media. As the topic deepened, Kepler, Descartes, and Fermat also joined the discussion. When they were together, they didn't talk much about this issue, but now that they start to discuss it, they find that the theory of the refraction of light is becoming more and more complex.

Because there are many missionaries in the university of Daming, except for Xu Xiake, who can't understand their conversation, the rest of Li Ciyu, Gu Yanwu and others have listened to these foreign teachers in the school, in order to better learn knowledge, they have all worked hard to learn the language they are interested in, so they can still understand the language of these people.

Chen Zilong quietly listened to the discussion of these people, silently recording the key words they discussed, and recalling what he had learned over the years. Suddenly, I thought of Zhao Youqin's "New Book of Leather Images", as well as the shadow puppet show I often watch. So Chen Zilong said his thoughts, like the principle of small hole imaging, he couldn't say, but it did not prevent him from describing this principle, so that everyone could do further discussion.

The discussion became more and more intense, and even various points of view clashed, and everyone began to compare their own experiments one by one, tell their own research results, and even point out the theoretical and experimental defects of others. Descartes kept calculating, and even asked Li Ciyu to use an abacus to help him calculate, in addition to calculating the results of other people's experiments, he also summed up these results to form a bunch of valid data, and then looked for patterns in these data.

Chen Zilong's goal has changed, he is now staring at the calculation results of Descartes and Li Ciyu, and gradually discovered a certain law from it, and then told Descartes about this law, so that Descartes reached the inspiration, and finally got Kepler's law and Descartes' law of refraction in later generations, but now they can't name these theorems by their own names, this is the result of everyone's joint research.

After a heated debate, everyone was a little tired, and in order to encourage the philosophers to study, Xu Xiake had already arranged a sumptuous Chinese lunch, not to mention where to find a cook now. Xu Xiake and his party are all treasures in Zhu Youxiao's heart, in addition to arranging Fu Shan to follow them to prevent illness on the way, the most important thing is the diet, in addition to the fresh vegetables are inconvenient to carry, like all kinds of spices, pasta are countless, slowly a large boat is prepared for these baby scholars, I am afraid that they are not used to eating, as for the chef, it is even more of a variety of cuisines, rotating to satisfy everyone's appetite.

There is no need to find fresh vegetables and meat in Paris, there are all over the street vegetable market, Xu Xiake has already asked the chef to buy enough on the street, and even in order to make these scholars eat happily, those that need to be cooked in advance have already been prepared. Let's start with eight vegetarian platters, and put a few jars of Moutai liquor on it, so that everyone can be at the bottom. Next is the hot dishes, such as steamed fish, large pork ribs, fish-flavored shredded pork, boneless chicken, etc., accustomed to eating those European meals that have no taste, and then look at the Ming chef to make these delicious meals, with the cellar of Moutai old wine, so that these European scholars have a great appetite, and they are full of oil.

When the happiest time, there will be a tragedy, when everyone pushes the cup and changes the lamp, immersed in enjoying the traditional Daming food, Kepler's jaw accidentally dropped, that is, the jaw is out of touch, only to see Kepler's face full of pain with his mouth open, can not speak, can not eat, for a while the lively atmosphere immediately quieted down.

As the master, Marin Mason hurriedly asked the servant to ask for a doctor, Fu Shan did not speak, walked over directly, supported Kepler's chin with his right hand, and held the back of his head with his left hand, taking advantage of Kepler's distraction, he pushed upwards violently, and then listened to Kepler's "ah", and then he could speak and chew, but it still hurt slightly. Fu Shan gently helped Kepler massage his face with his hand, asking him to spit out the contents of his mouth first, and told him that it was best not to eat hard food these days, and not to open his mouth wide and laugh.

Looking at Fu Shan's wonderful methods, these European scholars really wanted to meet the magician, in their opinion, such a condition needs to be done by a special doctor, but they didn't expect this young man to be able to do it simply. Looking at a table of astonished scholars, Li Ciyu took this opportunity to introduce Fu Shan to everyone again, including Marin Mason Only then did he know that Fu Shan was an excellent Chinese medicine practitioner.

Marin Mason immediately sounded about what happened to his wife a few days ago, and he thought that Fu Shan only knew how to be a gynecological soldier, but he didn't expect that he was still a general practitioner. Next, Marin Mason told everyone about his wife's illness a few days ago and how Fu Shan treated him, which surprised these scholars and began to ask Fu Shan about the status of Chinese medicine.

When it comes to his professional issues, Fu Shan is no longer as silent as before, and tells everyone about the traditional Chinese medicine theory of the Ming Dynasty, starting from "Tianwen", to Zhang Zhongjing's "Treatise on Typhoid Fever and Miscellaneous Diseases" in the Han Dynasty, "Qianjin Prescription" and "Tang Materia Medica" in the Tang Dynasty, until Li Shizhen's "Compendium of Materia Medica", from traditional Chinese medicine to traditional Chinese medicine one by one. Even Fu Shan didn't know what effect his lecture on Chinese medicine would play this time, and later it would cause a fever of Chinese medicine in Europe, making Chinese medicine a luxury medicine in Europe.

In the next few days, Li Ciyu, Gu Yanwu and others continued to communicate with European scholars, and gradually figured out the differences between the European teaching system and the Ming Dynasty, as well as the traditional Ming teaching methods and thinking models to discuss each other and learn from each other's strengths.

The most important thing is that the Ming scholars have discovered many things that Zhu Youxiao told them here, and through the discussion and research in the past few days, they seem to have some verification from here, or a feeling of sudden enlightenment, and this feeling is still experienced unconsciously, so that they themselves are incomprehensible.

From the discussion in the past few days, they know the true face of the "Geometric Original" and understand the importance of Descartes' analytic geometry, such as linear equations, higher-order equations, coordinate charts, classification analysis, etc., so that the Ming Dynasty's research on mathematics is more in-depth. The special research of Johann Kepler, Pierre Fermat, Cavalieri and others has enabled Ming scholars to understand the many branches of mathematics and realize the diversity of mathematical research. There is also Marin Mason's approach to learning and research, which makes everyone feel refreshing and opens up a wider range of ideas.

Happy days are always very short, a week of discussion and study has made the European scholars delay a lot of things, after all, these people are not all professional scholars, and many are amateurs, with a reluctant mood to end this seminar, whether it is the Ming scholars or these European scholars, they have gained a lot in this seminar, are very excited, and even agreed to continue to carry out such a discussion in the future.

Bidding farewell to Galileo and Marin Mason, Xu Xiake continued to visit Europe with the Ming scholars, but after a few months of process, they found that apart from the great gains in Paris, they had achieved little in other places. However, even Zhu Youxiao did not know that the highest scientific academic achievements of this era were in France, and Paris was the center of Europe. And Britain in this era still belonged to the barbarians in the eyes of Europeans, although there were some famous scholars, but they had not yet reached the point of being taken seriously. It was only when the development of Britain's commodity economy reached the next stage of development, and even after the emergence of Newton, that the status of British scholars gradually entered the eyes of mainstream European scholars and made them pay attention to it.

Of course, no matter what happened to the Ming Dynasty, Xu Xiake was sorting out the harvest on the way back, whether it was this wonderful discussion, or the customs of Europe, Xu Xiake made a wonderful description, which was passed down to future generations and became a classic travelogue of the Ming Dynasty.