

19201 



NOYES &* WEGHORST— ROOTS 



335 



Fig. 4. — Roots from soil fertilized with 10 tons of manure: left to right carbon 

 dioxide treatments of soil were o, 8, and 24 hours per day. 



Fig. 5.— Roots from soil fertilized with double application of complete fertilizer 

 to right carbon dioxide treatments of soil were o, 8, and 24 hours per day. 



