"Grandpa Huang, please see, this is the quilt and clothes made of cotton, that is, white stacks," After the meal, everyone rested in the pavilion, Feng Daiwen took out a few quilts and cotton clothes that the workers had just made and said:

"Oh, well, it's so soft," Li Yuan stretched out his hand and pressed the quilt and said:

"Yes, it's very light, it's very hot" Li Shimin put on the cotton clothes and quickly took them off:

"Hehe, with this quilt, Grandpa Huang, you only need two quilts in winter, and it will be very warm if you don't need to warm the bed" Feng Daiwen looked at the more than 10 pounds of quilt in Li Yuan's hand:

"Oh. That's really great, I don't need to cover a 7.8 quilt in a winter, it's heavy, it's not warm, if it's not a warm bed, I'm worried about dying of cold" Li Yuan was happy:

"Weiguo, this, cotton, right, is it easy to go to cottonseed? Can it be mass-produced? This thing is really good, I sweated profusely as soon as I wore it, and it was lightweight, if a large number of border troops were equipped, then even in winter, I could fight" Li Shimin asked Feng Daiwen excitedly, Li Shimin is worthy of the first emperor of the ages, and everything is thought of by the military and the people first.

"This is the Western Regions white cloth, that is, cotton cloth and cotton in the middle, impermeable, can be a good cold, simple to make, but now there is not much cotton in the Tang Dynasty, Erchen has already asked the merchants of the Western Regions to buy a large number of them, and let Cheng Chumo, Yu Chi Baolin and others personally go to the Western Regions, there should be a lot of them this autumn, and I Datang can also plant," Feng Daiwen explained:

"Okay, very good, where can I plant it in Datang?" Li Shimin was very happy with Feng Daiwen's arrangement, clapped his hands and said:

"I can plant in the northwest region of the Tang Dynasty, and Guanzhong can also do it, and the minister plans to bring the existing seeds to Shuofang to plant, and the cotton clothes are thick, and the bow and arrow are far away and cannot penetrate, but now we need to prepare a large number of manpower" Feng Daiwen to:

"There is no problem, the arrangement for defending the country is, I want to see the results as soon as possible, and I need someone to recruit them" Li Shimin waved his hand and said:

"Erchen wants to ask the queen mother to select palace maids in the palace and learn to weave cloth with cotton, so that it can be promoted from top to bottom in the future. It just so happened that there was nothing to do with the vassals that his father had given to Guang'an, and Chen planned to let them manage and learn to remove cotton seeds and play cotton, I don't know what the queen mother thought" Feng Daiwen said:

"Yes, I know that I feel sorry for Guang'an, this cotton is almost the same as silk after removing the cotton seeds, and the weaving is very simple" The eldest grandson looked at Feng Daiwen with a smile and said:

"It's a good boy, Guang'an is a blessed one," Wan Guifei also said with a helpful smile:

"Eh, father and queen mother, please drink tea," Feng Daiwen and Guang'an both made a big red face, and hurriedly arrived when they saw the maid bringing tea:

"Hey, Wei Guo is good, you still have ice cubes now" Li Yuan asked in surprise:

"This is made of saltpeter, not ice cubes," Feng Daiwen said.

"You, you, say that this ice is made" Li Shimin also asked in surprise:

"Yes, father, the son is silent, in fact, many incredible things are passed on because they don't understand," Feng Daiwen said as he asked people to send a basin of water and saltpeter,

When everyone heard that Feng Daiwen was going to condense water into ice, they all gathered around to watch, Feng Daiwen took the wooden basin and poured clean water, let Li Shimin test the temperature, and then put in saltpeter, only to see that soon the water basin began to come out of the cold, and the thin ice on it had begun to condense.

"This,,This,,,It's incredible," Li Yuan sighed:

"Yes, if it wasn't for Wei Guo's explanation in advance, I couldn't have imagined that it was actually the role of saltpeter" Wan Guifei echoed Li Yuan and said:

"It's just that this ice can't be eaten, but it can be used to cool down the heat, frozen items, as long as you don't put the food directly on the ice, it's fine" Feng Daiwen put some saltpeter down, and soon a basin of water turned into ice.

"You're saying the saltpeter ice is poisonous?" Li Shimin frowned and asked:

"Back to my father, in fact, as long as it is made of minerals, it is poisonous and harmful to the human body, but the human body can decompose toxins, and you can't see it when you take it in small amounts, but think it's a good thing, just like the Taoist mercury, cinnabar and other elixirs" Feng Daiwen thought of the Qin Emperor Han Wu's crazy alchemy for the pursuit of immortality, so he carefully explained:

"I saw with my own eyes a Taoist priest who took pills all year round and came to life after death, what is going on?" Li Yuan asked.

"This is the elixir made of minerals that has been taken all year round, his body and blood are full of minerals, attenuating the degree of his change, if the imperial grandfather doesn't believe it, he can use animal experiments to give him the elixir for a long time, until it dies, to see if it will rot for a long time, but to reduce the dosage, if the dosage is increased, the animal may die immediately, the smaller the animal dies faster" Feng Daiwen can't say that there are many mineral toxins in the blood of the body, and the bacteria grow slowly to explain, I have to explain it with a reason that everyone can understand:

Li Shimin nodded and did not speak, Li Yuan's face became a little ugly,

"But if it's a small amount, as long as you don't take it in the future, eat more vegetables, and it's okay slowly, if it's like this, we can drink ice water" Feng Daiwen explained, while putting saltpeter in a basin of water, putting a bowl of tea on the surface of the water, waiting for a while to let a little ice in the bowl condense a little bit and drink it, "Comfortable," Feng Daiwen smiled with satisfaction,

"Brother-in-law, brother-in-law, I want to drink it too," Changle and the others ran over and yelled when they were having a hot time:

Feng Daiwen hurriedly froze the tea water and gave it to everyone, "You can't drink too cold when you run hot, just freeze it a little."

"I've seen the Emperor, sage," sent Yuan Tiangang, who was in a hurry to gather people, Ma Zhou took a few guards carrying two stoves, one large and one small, and the guards came over with a box of black coal.

"Done so quickly?" After Ma Zhou finished seeing the ceremony, Feng Daiwen asked unexpectedly: I can't help but be happy for the craftsmen of Datang, it is really amazing, and I quickly made a sample with a little hint.

"What is this?" Li Shimin looked at the stove and asked puzzledly:

"Father, this is a good thing, with this thing, it is much more convenient, you can have hot water at any time, and it can also save wood fire" Feng Daiwen happily said while letting people bring the wood fire to ignite the trial:

One of the two stoves is a single-hole furnace and the other is a three-hole furnace, because the coal is fine, it will ignite quickly, put it aside and wait for a short time before a raging flame ignites, pick up a small pot filled with water and put it on top, there is a wooden cork made of wood below, when not in use, plug the flame below and above, "If this fire is plugged with a coal block below, it can be managed for 3 or 4 hours, even if it cooks rice, the average family will use a coal block," Feng Daiwen explained:

"Yes, it's a good thing, in the future, poor families can have hot water at any time, and they can also roast around the fire in winter, but how to solve this carbon poison", Li Shimin Even if Li Shimin's first consideration is the people,

"As long as this is placed in a ventilated place, as long as the house is kept ventilated, there is no problem," Feng Daiwen replied.

"Yes, when I was in Taiyuan before, I saw that the doors and windows were indeed closed when I was in Taiyuan twice", Li Yuan thought for a while:

"Okay, good, Wei Guo is really my good son-in-law, haha" Li Shimin laughed happily:

"Father has won the award, this coal is also called coal, the father sees who is responsible for mining, Erchen has only bought two small mines at present, this thing is the most in Taiyuan" Feng Daiwen to:

"Taiyuan?" Li Shimin frowned:

"Yes, this thing will inevitably be in demand in the future, so it is better to control it, but it can be handed over to others for mining, the state is responsible for production, and taxes can be collected" Feng Daiwen said:

"Give it to someone else to mined,? Isn't it controlled by others," Li Shimin said:

"Yes, the government only needs to send people to supervise, the amount of mining, not to abuse the people's power, it is best to use all prisoners to mine, such as stipulating that the use of prisoners to mine less taxes, etc., the mining can only be mined, and the production must be used in another one, so that there will be no chaos, and there is not only one place in the country that produces, if he is not satisfied, he can not sell it at all" Feng Daiwen smiled gloomily:

"Haha,,haha" Li Shimin laughed happily:

"Haha, haha" Li Yuan figured out the key to it, glanced at Feng Daiwen and laughed at the same time: