PLATE XXVII. 



Showing rate of development of various organ- 

 isms in extracts of sand soils cropped 

 in different ways. 



_ »■ 



4- 

 ^ S JO 



gtf 



u 



& 



bellow Ammonificr 



/ cfc»< 



C 5 aletijs 3 olatfS 4 days 



_ 



?0 



is 



■2 «j 



/O 





Bqc/IIus Prodigies us 



/ a/oiy 



2 cloys 3 days 4 c/oys 



_ 



= £ 

 to 



S ' 

 %. 



10 



I 



1/ 



Bad/ Jus protean vulgarus 



1 day EdatLfo 3daus 4 days 



