Time extends backwards, the Tao River water freezes, and the problem that has plagued Xiao Feng for half a month is solved, and the clansmen can stand on the thick ice and pull up the waterwheel wheel lying on the ground with a fixed pulley and fix it on the base.

The scraper of the waterwheel is very wide, and the current of the Tao River is completely capable of driving the wheels to rotate on their own, carrying the water from the lower places to the higher places.

It is a pity that Gu Guo did not find a shadow of colchicine plants in his botanical knowledge, and the plan to breed polyploid wheat came to naught.

Now the yield of wild wheat can only be won by varieties whose ears are not broken.

Babies born this year ushered in their first New Year, and with the help of copper forceps, no one has died due to dystocia this year.

The laying of the skeleton of the sailboat, which is 15 meters long and has a mast 9 meters high, is also nearing completion, with a jib in the bow to stabilize the ship and control the course. Due to the freezing of the Tao River, the construction of the shipbuilding was slow, and Gu Guo estimated that the upper deck would not be laid until the beginning of the next spring.

There were already snowflakes outside the house, and Gu Guo nested on the warm kang, rarely squeezing out a day of leisure.

He also doesn't know why he is so diligent after leaving the modern society, in his previous life, when he did five days off and two days off, he often complained that the food in the unit was not good, but now he is busy all year round.

The people used hawksbill hoes to break the ice, carved a large hole in the water, and used several wooden barrels made of wooden planks to serve as tools for transporting fresh water.

Gu Guo concluded that the location of the tribe should be in the middle and high latitudes, similar to the latitude of the Yellow River basin on the earth, and a thousand kilometers further north is not suitable for the current human existence. But he couldn't be sure if the other world would evolve a race similar to the Neanderthals who lived in high latitudes on Earth.

After all, the humans in the James tribe look different from themselves, maybe they are the same group that diverged tens of thousands of years ago, or maybe there is reproductive isolation between the two.

People are always cranky when they are idle, and after their thoughts diverge, they quickly condense themselves on the topic of species reproduction.

When the four tribes lived together, the men who had enough food always wanted to know who their descendants were. In the past, multiple tribes were so far apart that many-to-many pairs between men and women could only identify the mother of the child, while the father could only care for other people's children in his own tribe.

Now that he wants to have a child with Huaihua, a child of his own, the sharp-eyed Gu Guo saw that his cousin liked the priest's daughter as early as last year when he built a house.

However, the production of camelina is inseparable from the collective, and even if the appearance of the house allows people to huddle together into small groups of more than a dozen people, it is still very difficult for a person to live alone in this era.

In order to achieve monogamy, men and women have exclusive rights to each other, and they are no longer obliged to be sheltered by the tribal group.

Since you only live with each other, why should we give you what we have hunted?

Gu Guo saw the troubles of the camelina that this problem could only be solved by farming, but the second generation of wild wheat still did not satisfy Gu Guo, and the waterwheel built at the end of the year could only irrigate two or three hundred acres of land.

Seeing that the clansmen were carrying water into their water tanks bucket by bucket, Gu Guo suddenly remembered something that had been neglected for most of the year - digging wells.

When the city wall was built, he was busy planning the drainage project on the 40,000 square meters in the city, which was closely related to the life of the tribesmen, and the wells that solved the water source problem nearby were left behind by him.

It is said that in ancient times, people looked for mugwort bushes before digging wells, but Gu Guo, who was in another world, did not know the relationship between plants and groundwater in this world, and there was no detailed description of this in simple botany.

Fortunately, the soil at the site where the city was built was relatively moist, and there should have been an aquifer underground.

In order to prevent the tribesmen from having to walk two miles of land miserably every day, just to pick up two buckets of river water, Gu Guo decided to dig on the spot.

There is no shortage of people who break ground, and when people hear that they don't have to walk for more than ten minutes every day to fetch water from the river, they all come to watch the site of digging wells in their spare time.

On the top of the wellhead, a two-meter-high support is erected, and two sets of pulley sets are installed on the support, which are dismantled from the place where the water wheel was built, which can provide two people to go down the well at the same time to excavate.

For every metre of excavation, a few logs are used to support the surrounding walls to prevent the opening from collapsing.

Without the guidance of professionals, Gu Guo did not know how deep he could dig to seep out the groundwater, and the original team that built the waterwheel was divided into two teams at this time, and they took turns to work under Gu Guo's command.

With the bronze tools, the excavation progressed very quickly, often extending down to a depth of half a meter in an hour, and the two rattan baskets kept transporting the earth upwards, and the darker and darker soil indicated that there was really a water source underground.

Let Hongmei take people to burn some terracotta bricks, it is not a long-term solution to fix the wall of the well with wood, and the best way is to use stone, so that the well can be fixed for thousands of years without collapsing, but Gu Guo does not have time to let the clansmen chisel out hundreds of regular stones weighing hundreds of catties, it is not as convenient as using bricks.

A birch with a thick hemp rope hanging on his back, and a finger-thick firewood in his hand, wrapped in a thick layer of animal skin and grease, was slowly burning.

In order to prevent the people below from being poisoned by poisonous gases, Gu Guo used the earthen method of measuring gas with torches, as long as the torches were still burning, it meant that there was oxygen underneath, and the clansmen standing at the mouth of the well could clearly see every move of the people below.

As long as the torch is extinguished, whether the firewood is burned out, or because the burning has accumulated too much carbon dioxide and carbon monoxide, the people will pull the people who went down the well up as soon as possible.

With the help of a plumb hammer, the tribesmen dug vertically downward, and in just four days the first well in the city came out of the city, compared to the tedious work of measuring the roundness and length of the waterwheel.

The ancients said: "To make the bottom of the well, use wood as the bottom, brick as the second, stone as the second, and lead as the top." It is a bottom, and the stone is one or two feet thick, which can make the water clear and delicious. If the well is large, put a few goldfish or crucian carp in the middle, which can make the water taste delicious, and the fish will eat water insects and soil criticism. ”

The lead here is metallic lead, and of course Gu Guo will not use metallic lead as the bottom of the well, but using fine stones to filter the debris in the water and using fish to exterminate the small insects in the water, Gu Guo still uses it.

This is the wisdom of the ancients summed up by experience.

Under the pressure of atmospheric pressure, the water level in the well slowly rises until it is four meters away from the wellhead, and Gu Guo estimates that this is the groundwater connected to the Tao River, and the water level is level with the Tao River.

After raising the mouth of the well, the tribesmen built a small pavilion above the mouth of the well to prevent some fallen leaves and bird droppings from falling into it.