98 



KANSAS UNIVERSITY SCIENCE BULLETIN. 



Table VI. — Influence of the extracts of variously cropped soils upon the rate of multi- 

 plication of B. prodigiosus. Number of bacteria per cc. of extract. 



Soil. 



Crop grown. Initial. First day. Second day. Third day. Fourth day. 



Marsh 



Control . ... 238,500 59,000 



Corn 350,000 910,000 



Oats 286,500 57,000 



Clover 47II.IKII) 86,000 



Loam 



Sand 



Control. 231,500 



Corn 201,000 



Oats 302 , 000 



Clover 110,000 



Control 287,000 



Corn 241,000 



Oats 510,000 



Clover 284,000 



234.000 

 43,600,000 



387,000 

 15,500,000 



901 1.000 21,700,000 



84,000 1,770,000 



SO, 300 1,380,000 



SI, 000 490,000 



,200,000 4.5,300,000 



291.600 2,910,000 



22,000 268,000 



435,000 25,100,000 



420,000 



82,400,000 



2,210,000 



23,000,000 



19,700,000 



20,300,000 



8,700,000 



4,400,000 



38,200,000 

 7,500,000 

 6,700.000 



26,600.000 



4,900,000 

 22,600,000 

 11,500,000 

 34,800,000 



17,400,000 

 14,300,000 

 13,300,000 

 13,400,000 



16,000,000 



11,300,000 



8,600,000 



15,700,000 



Table VII. — -Influence of the extracts of variously cropped soils upon the rate of multi 

 plication of B. proteus vulgaris. Number of bacteria per cc. of extract. 



Table VIII. — Influence of the extracts of variously cropped soils upon the rate of multi- 

 plication of one of the ammonifying organisms. Number of bacteria per cc. of extract. 



