EXPERIMENT STATION BULLETINS. 



347 



79/0 o^a/r AS" r>/fro^e/7 

 /70 ya/c/e <i//7///// e/^Z-ers 



the so/7 /77a£s a/?e^/Sy 

 //xed 6/ //i///?^ gep 

 //7 the faderc/i 

 o/lhe/^ ^er/77s'7n 

 f/?e so/7 



FiQDRB 3. — The cheapest source of nitrogen is the air. More legumes should be grown in Michigan. 



