...vegetation, I have sought to determine, by close chemical and physical examination of the soils in their natural condition, the causes that determine...Southern States, virgin soils are still obtainable, where manure is unknown, and where the simple history of each field can easily be gathered from the lips...

...vegetation, I have sought to determine, by close chemical and physical examination of the soils in their natural condition, the causes that determine...cultivation, their special adaptations, etc." " It is evident that when used in this connection, and made uniformly and systematically, with a definite...

...vegetation, I have sought to determine, by close chemical and physical examination of the soils in their natural condition, the causes that determine...cultivation, their special adaptations, etc." " It is evident that when used in this connection, and made uniformly and systematically, with a definite...

...in their natural condition the causes that determined this natural selection on the part of cf rtain species of trees and herbaceous plants, while at the...behavior of such soils under cultivation, their special adaptation, etc. At the very close of the century the ideas brought out by the development of physical...

...chemical and physical examination of the soila in their natural condition the causes that determined this natural selection on the part of certain species...plants, while at the same time observing closely the behaviour of such soils under cultivation, their special adaptation," etc. For » number of jears his...