The Witch and the First Army had been out for four days, and it was planned that they should arrive on the outskirts of Silver City by tomorrow afternoon.

Equipped with honey-equipped flying messengers, Roland received letters from the team every day, iron axes, Anna's, and nightingales, though not as fast as mobile phones, and basically similar to radio reports.If there are several times more flying messengers on this route, there are birds running back and forth between the two places at all times, and perhaps they can simulate the effect of text messaging and chatting.

On the day of the Nightingale's absence, the chief knight took over the task of defending the castle.But what puzzled Roland was that Carter was always happy these days and seemed to encounter something particularly happy.Is it so happy to be in charge of personal protection?

He shook his head and focused his attention on the debriefing of the Minister of Construction, Karl Falbert.

With the help of the Sleeping Island Witch, the construction project in the border town has been making rapid progress for more than a month.

First of all, the steel bridge on the Redwater River was successfully completed - compared with the traditional stone bridge and boarded bridge, the steel bridge body can be pre-made, and then the overall hoisting, coupled with the two floating islands raised by the lotus in the river, further simplifying its difficulty, so that the main bridge construction period shortened to an amazing month.

Although the eyes of the future, it is short and narrow, the structure is too simple, the load is very low, and it is a waste of materials tofu slag project, but in this era, it has been a magnificent super bridge - a total length of more than 100 meters, and the bridge is straight, for two carriages to pass side by side, the lower part can also meet the inland sailing, no matter which is not a bulky stone bridge can be done.

Second, the new wall of Lian was also closed.This pure-earth-heaped wall has more than tripled the area of the town, and if the city is built in the future, the original town will become a veritable "inner city".However, Roland prefers the second ring to say that perhaps one day, this place can also be expanded into a giant city with seven rings, officially crowned the name of the imperial capital.

Finally, the construction of the Kingdom Avenue, some of the foot of the mountain that spread down the desperate mountains were reduced to the ground by lotus, so that the road can pass straight through, greatly reducing the total construction period.

“Your Highness, what is your next construction plan for Lotus?”Carl asked after reporting the progress.

It can be seen that he is envious of his ability to transform the terrain, but he has not asked to include her in the Ministry of Construction and appointed a deputy minister.

“Well...” Roland was also thinking about this, and he had three major renovation projects to be implemented.

The first is the out-of-sea project: looking for a low-slung opening in the mountains at the southern end, and then settling down into a road that can enter and exit the shoal, which must rely on the ability of Lotus to do so.Once the transformation is completed, the western border has a harbor facing the sea.

The second is residential expansion: although the city hall has invested a lot of human and financial resources to strengthen the construction of residential areas, but in the winter, there may still be nearly 3,000 people unable to live in warm brick houses.The wooden sheds and simple shelter now simply could not meet the needs of the cold, so he needed a number of cave houses with thick walls and torches to solve the problem.

The last point is to build a dock: to produce a shallow water heavy gunboat, he must first lay a spacious dock, but also can not affect the passage of the red water river.Roland intends to lower the height of a river embankment in the west of the town to form a dry dock, and install a lift gate on the side close to the Red Water River to control the water and release the water.The earthwork is huge in scale, and it also depends on the ability of Lotus to complete.

After a moment's consideration, he finally decided to put the residential expansion first, and since he brought the fugitives to the border town, he was responsible for their food, clothing and housing.If you freeze to death and starve, it will not only lose the West, but also reduce the sense of belonging to the people.

“Where is this temporary house built?”Carl then asked.

“Leave it in the current serf shantytown,” Roland scanned the map, “and away from the walled line, there are desperate mountains to hide the wind.”

The Minister of Construction withdrew, and he had just leaned back in his chair to take a nap, and Kemo Struer came to the door.

"Your Highness, I have successfully developed the large-scale acid-making method you have requested."

This sentence suddenly dispelled Roland's tiredness, and he stood up from the table in surprise: "Really?Take me to see.”

When a group of people came to the laboratory on the river of Redwater, they saw several gray-white jars and a furnace next to the No. 5 laboratory, each of which was about two people high, and the top was connected by a pipe, and the smooth shape was obviously cut by Anna.

"Hail to you, Your Highness," said a young-looking lad, waving at Roland.

“You are Chammel, aren’t you?”Although it has long been known that Kemo dug a group of alchemy apprentices from Chishui City and also attracted an outstanding alchemist, today he still sees each other for the first time.

“You remember my name,” Chames was surprised.

"Mr. Kemo has mentioned you many times," Roland patted him on the shoulder to encourage, "do it well."Then he looked at the chief alchemist and said, “How does this thing make sour?”

Kaimo smiled at his beard, "It can be successfully developed, completely according to the reaction on the primary chemistry."You see the furnace, the purified sulfur will be burned in the kiln, and the resulting gas, which is further heated and fed into the lead tank.”

“Are these devices made of lead?”

"Yes, only lead can resist the corrosion of acid."Kemo nodded, "the lead pipe at the top of the tank continues to sprinkle nitrate sulfuric acid, under the burning sulfur dioxide gas, nitric acid is heated to break down into nitrogen oxides, and finally with water, sulfur dioxide to form a sulfuric acid solution, flowing from the bottom of the hole - this reaction is clever in the nitrogen oxide only plays the role of oxygen transmission, itself is not consumed, so the amount of nitric acid is not large, once the reaction begins, the energy continues!"

“How is its production?”Roland excitedly patted the lead canister and asked.Large-scale acid production is a prerequisite for mass production of smokeless gunpowder, and if this problem can be solved, a new generation of ammunition for even fire guns and artillery is promising.

“This is the fourth device I’ve tried, and the output of one day is probably worth the weight of a week’s lab distillation.”The chief alchemist proudly said, "Because there are experimental factors, it is not large in volume."If a larger capacity of lead cans can be built, the yield could be further increased.”

"That's good news," laughed Roland, "and when Miss Anna returns, you will at once begin building a larger acid-making device."In addition, if there is not enough lead, iron can be replaced, and Miss Soroa's coating can save the iron from the corrosion of acid.”

Kemo nodded, but his next words made the prince's smile freeze on his face.

"Now that the large-scale acid-making method has come to fruition, and all five laboratories have been filled with apprentices, your Highness, can you promise me the medium chemistry?"(Unfinished.