Some people's eyes burst into light.

The others laughed and shook their heads.

"What are you thinking? This recipe has been announced, everyone knows how to refine saltpeter, and you still expect to sell it? I guess the merchants who sell saltpeter won't make any money......"

"Well, don't you know? I heard that a merchant selling saltpeter intended to assassinate an official in Beijing, and he was arrested by His Royal Highness the Crown Prince, and it is because of this that the recipe can be announced! ”

Everyone knew immediately.

In any case, this method of making saltpeter has been announced, and it is also a good thing for the common people.

The summer heat is unbearable, and every family hopes to save some ice in their homes, but the price of saltpeter is not expensive for the princes and nobles, but for the people, it is difficult to consume.

Now that this recipe has been announced, the people can also refine saltpeter.

The people crowded excitedly in front of the imperial list, expecting the officials to announce the method of refining saltpeter, and some adults who studied the government according to Chen Mu's instructions rushed to the front of the imperial list before the evening, and posted the method of practicing saltpeter.

When the adults who studied the government left, and the people walked to the emperor's list, they took a closer look at the method of making saltpeter, and everyone changed their faces, and some people muttered.

"This ...... This practice is saltpeter's recipe is so weird and terrifying, you have to boil dung! Chicken manure and duck manure ...... OMG......"

"Well, even if I know the recipe, I don't want to make saltpeter, or I'd better buy it from a merchant."

Some people shook their heads again and again, and there were also people who were living in poverty who saw this business opportunity and were ready to grit their teeth and do the business of refining saltpeter and selling it.

In any case, this can be regarded as giving the people a way to live.

Saltpeter can be self-sufficient, which also reduces the freight rate by one percent, and the price of fruits and vegetables naturally drops a lot, Chen Mu nodded with satisfaction.

While letting people open up trade routes and continue to make cold storage trucks, Chen Mu also paid attention to the north.

Some time ago, he had just gone to the north to deal with the uprising, and now he could just send someone to ask how the rebel army camp was established, and whether they relied on their identity to make a fortune in the north.

Although these rebels were all from poor people, they were able to ascend to heaven once, and no one knows whether their hearts will change.

"In addition, there are floor heating and ondols and the like, and it will be very cold soon."

"When I went to the north this time, I saw that only a few people in the towns had built ondols and fire walls, and it seemed that no one had repaired floor heating, and those who repaired the kang and fire walls were all from large families."

In these years, the people still used firewood for heating, and no one used coal for heating.

During this time, when Chen Mu led his troops to fight and expand trade routes, he found several coal mines of considerable scale, but he could take advantage of this time to promote coal to the people, so that those people could build fire walls and fire kangs, and even floor heating.

In this way, it can also ensure that the people in the north will not get frostbite or even freeze to death in the severe cold.

"The land in the north is fertile, vast and sparsely populated, and it is obviously a very suitable place for the people to live, but because this winter is too bitter and cold, it is sparsely populated."

Lord Ye sighed, Chen Mu also nodded, thinking of this matter, Chen Mu pondered, and told the adults who studied the mansion about it, and let them ponder how to dig floor heating.

When the researcher heard this, he studied it carefully.

However, due to the difference in soil quality between the local area and the capital, the adults who studied the government were still not sure how deep to dig and how much coal to use for floor heating.

"Otherwise, I'll take them to the north to see how the rebel army in the north is doing."

Chen Mu had an idea, and when Lord Ye saw this, he stopped talking, and in the recent period, the number of private visits to their micro-service was not too frequent.

Chen Mu raised his head and glanced at Lord Ye, seeing what Lord Ye was thinking, he sighed.

"I don't want to leave the palace often, after all, the palace is full of political affairs, and many of them have to be taken care of by me personally, but you have also seen that if I don't leave the palace and don't pay private visits, I will find the undercurrent surging among the people."

"Only when you find a problem, can you think of a solution to it, and I have been staying in the palace, I don't know if the people have encountered any trouble in their lives, and I can't help them solve it."

Lord Ye understands this truth, Chen Mu cares about the people and the world, he often sighs and sighs, seeing Chen Mu say this, Lord Ye nodded and agreed, and arranged the matter.

Lord Ye called Cao Lao and the others again and asked about the weather in the north during the recent period.

It's late autumn, and it's about to start winter, and I don't know if there will be snow in the north in the near future.

Cao Lao and the others watched the sky at night, and after a closer look, they saw that something was wrong.

They hurriedly entered the palace and told Chen Mu and the others what they had discovered.

"Your Royal Highness the Prince, there is a snowstorm coming to the north, and this snow is coming too early, and the north is going to be very cold this year."

Cao Lao was panicked.

Chen Mu also looked serious.

Blizzard, big cold......

The situation was indeed not optimistic, and after asking about the time when the heavy snow came, Chen Mu did not delay, immediately counted the manpower, and prepared to go to the north.

Meng Qing originally planned to follow, but Chen Mu heard that Meng Qing was afraid of cold, so he asked people to stay in the palace, Meng Qing was pregnant, and Chen Mu was frightened when she left the palace several times before.

If you accidentally catch a cold in the north, it will not be good if it affects the fetus in the womb, Meng Qing also knew that Chen Mu's words did have some truth, so although she was reluctant to give up Chen Mu, she still stayed in the palace according to Chen Mu's arrangement.

Chen Mu led people to the north, and when he arrived at the city not far from the north, Chen Mu felt that a cold wind was blowing from the direction of the north, and the cold wind came one after another, and the carriage was shaking.

Chen Mu took the stove from Lord Ye's hand and sighed with emotion.

"You have to be thoughtful, otherwise I don't remember to bring a heater and come to this northern border, I'm afraid I'm going to freeze."

"It's not good to freeze, His Royal Highness the Crown Prince is thoughtful, and after coming to the north, he will take care of all this for himself, and I just did my duty."

"His Royal Highness the Prince, it's so cold in the north, the floor heating and ondol you said you want to build haven't been built yet, should we still build it this year?"

Master Ye remembered something important and asked.

Chen Mu nodded, of course it is necessary to build, the winter in the north is long, starting from November this year, and it will be a very cold day until March of the following year.

If this warm kang and floor heating are not built, the people in the north are afraid that they will have to suffer for a long time.

It won't take long to study how to build underfloor heating and ondols, so that all the people in the north can do it themselves.

In addition, some silver was given to the people so that they could spend the winter.

I think that the people will not resist the floor heating and the ondol.