With the experience of the first room, the tribesmen rammed the earth three points faster.

Gu Guo nodded with satisfaction, and he used stones to enclose the outline of the foundation of twenty-five rooms on the ground, according to the layout of five by five, with two meters of space, two meters between the front and back, left and right, so that a living area of about 30×40 meters was planned.

More than 200 people squeezed hardly enough, enough to survive the whole winter.

After explaining a few words to the clansmen, Gu Guo returned to the cave.

You can't make the kang in the north of the rabbit's house with the plate building method, so you need the mud bricks made by Hongmei's team.

However, it is impractical to transport mud bricks by manpower, and the cave is half a day's journey from the Tao River bank, and it takes two days to go back and forth, which is not only time-consuming, but also has a small volume, and cannot keep up with the speed of ramming the wall.

After observing the depth of the Jishui River, Gu Guo decided to make the most primitive boat out of tree bark and use it as a means of transportation between the two places.

The earliest river crossing tools in previous history were clay pots, and there are also ancient civilizations that made canoes from animal skins and tree bark, such as the Indian Kutnei people who made canoes out of bark or young branches, and then wrapped elk skin around the wooden strips or the frame of young trees.

In the north of the rabbit's house, the fishermen and hunters used birch bark boats made of birch bark to fish, hunt and transport, this kind of small boat with willow wood as the frame and birch bark as the bottom of the boat is not only simple to make, but also light in weight and can be carried by one person. The only disadvantage is that the life of this kind of ship is not long, and the finished product that Gu Guo hastily sorted out is estimated to only last one or two years without being embalmed.

However, it was said to be light, but it was quite difficult to do, first of all, the willow wood frame, just tying it into the shape of a small boat, it took Gu Guo half a day's effort. Fortunately, he studied mechanics, and his hands-on ability was slightly stronger, so that the tied frame was not so crooked.

Gu Guo lifted the skeleton of the birch bark boat in his hand and felt it, the more than four-meter-long shelf was lifted above his head with both hands, and the dense willow wood was tied up by him strongly, no matter how he flipped it in his hand, there was no sign of falling apart.

As for the birch bark and pine resin used to make the bottom of the boat and the gang of the boat, it was everywhere in the forest, and it took Gu Guo an afternoon to pick up a large pile of birch bark from the forest.

The next day, Gu Guo took three or four men to put the skeleton on the bottom and taught them how to build a birch bark boat, at that time, this kind of small boat with a load of three or four hundred catties will frequently go back and forth between the upper and lower reaches of Jishui.

Since licorice was responsible for transporting food downstream, it was logical that he got a place on the first voyage of the birch bark boat, along with Gu Guo and a few clansmen who would become boatmen in the future.

It was now the fifth day that Gu Guo had come to the cave, and with the help of his clansmen, six birch bark boats had docked on the shore. Gu Guo simply cleaned up the weeds on the bank, and by the way, dug deep into the river channel on the bank.

Although the birch bark boat has a shallow draft, it will be troublesome to knock into the protruding stones on the riverbank, and make a hole in the bottom of the boat.

Six birch bark boats, with a total capacity of one ton, only need one day to go back and forth upstream and downstream, saving the capacity of thirty or forty people.

On the day the birch bark boat was launched, the tribesmen stopped their work and helped each other carry food and mud bricks to the boat, and people were amazed at what could float on the water.

"Boat!"

Gu Guo shouted, telling the clansmen the names of the six things that floated on the water.

"Boat! Boat! Boat! ”

The clansmen shouted, their eyes full of envy for the lucky ones who sat on the birchbark boats.

Xiao Feng followed the crowd with an unfinished clay bowl and saw her brother sitting in the thing called the boat, holding a wooden stick in his hand and poking it into the water.

As the six birchbark boats drifted away from the riverbank, white splashes of water trickling down the sticks......

The river surface of Jishui is not too wide, and Gu Guo and the clansmen behind him need to constantly adjust the direction of the bow of the boat to prevent the bow from poking onto the shore and causing traffic jams.

Looking at the scenery on the shore, Licorice was a little distracted, she sat on the beam in the middle of the birch bark boat, followed Gu Guo's example, and used the wooden stick in her hand to constantly change the direction of the bow of the boat to keep it forward.

Her birch bark boat was stuffed with dried meat and fish of various animals, as well as a large pile of tubers. Listening to Gu Guo's meaning, a birch bark boat carrying food once was enough for the group of people working on the banks of the Taoshui River to eat for two days. Compared with before, she took her people to carry food downstream in bamboo baskets, I don't know how many times faster.

The sun was still grinding in the eastern sky, and the six birch bark boats arrived at the intersection of Jishui and Taoshui, and Gu Guo estimated that it would take less than two hours for the birch bark boats to travel a distance of more than ten kilometers.

The current of Taoshui was more turbulent than that of Ji Shui, and Gu Guo and his party did not dare to row the birch bark boat to the center of the river, so they drifted downstream against the river bank.

The withered grass and trees that jutted out of the river bank rowed past the birchbark boats, and the morning dew that had not yet evaporated stained the hull of the boat, and then flowed into the river with the swaying hull. The leaves of the ginkgo biloba tree, disturbed by a breeze, fell in a few pieces, spun in a circle in the air, and landed in the arms of licorice.

In front of the licorice, Gu Guo hummed a familiar ballad from his previous life.

"A big river, wide waves, wind blowing rice and flowers on both sides ......"

Near noon, six birch bark boats arrived at their destination and docked them on the shore, Gu Guo could hear the sound of the men's rammed earth from a long distance, and a few hundred meters away, he could faintly see rows of neat houses standing on this plain.

I haven't seen them for five days, I miss them very much, and I don't know how many rooms these more than 100 people have rammed.

Fixing the boat on the shore, Gu Guo beckoned several clansmen to unload the goods under the ship, and several people worked for more than ten minutes to put the goods neatly on the shore. And among the people who built the house, it seemed that someone had spotted the six boats on the shore, calling friends to gather towards Gu Guo's side.

He has been in charge of digging the soil for the past few days, although his arms are sore, but his legs and feet have been idle, and he runs faster than those who stand on rammed earth.

From a distance, he saw Gu Guo building the mud bricks one by one, and behind Gu Guo, there were six new things floating on the river.

Running to Gu Guo and his party, he found that there was a large pile of food on the ground, but he counted it carefully and found that there were only six people transporting the food.

Before, it would take at least seven or eight people to transport a day's rations for more than a hundred of them, but the pile of food in front of him was enough for their group to eat for two days, plus a large pile of mud bricks and all kinds of pottery, how did the six people of Gu Guo transport so many things, did they rely on those things that floated on the water?

As if seeing through the doubts of the visitors, Gu Guo pointed to several birch bark boats behind him and shouted, "This is a boat!" People can float on the water when they sit on it, and the boat can not only transport people, but also goods! ”

In order to let the clansmen have a more intuitive understanding of the volume of the birch bark boat, Gu Guo took two clansmen to one of the boats, only to see the birch bark boat swaying on the water surface a few times, and then it did not move steadily, leaving only the ripples that continued to spread on the water surface.