Soil-Binders 59 



speedily weave a network of roots over the whole, 

 forming in time a thick mat by which the soil would 

 be effectually held together and consolidated, and the 

 bison who wanted a dust bath in future would have to 

 choose a fresh wallowing place for himself and his 

 companions. But the soil would have been won for 

 vegetation, and, once covered with green things, it 

 would not easily be given up again. 



