The inhabitants are separated by thousands of miles from each other. Experiments made in one locality are not accessible to others. They are in mountain valleys. they are in isolated communities. and they do not know what experiments have baen made. Immigrants are constantly going in there. and new discoveries in the art of raising crops by agriculture are made every year. It would take centuries for that information to become common. if you did not have some central locality where you could collect it and publish it. It is one of the most important things to be published that there is.
Keywords matched
Immigrants