PLATE XXVI. 



Showing rate of development of various organ- 

 isms in extracts of loam soil cropped 

 in different ways. 



Yellow Arnmonifier 



o 



day 



£ days 3 days 4 days 



t\ 



+- 



20 



.SB 



5 « 



E v. 

 ' ~ o 

 (J /o 



0) y 



c h 

 DQ 8. 



Racillus prof ens vulgaris 



day £_ days 3 days 4 days 



