746 CONTRIBUTIONS TO OUR KNOWLEDGE OP SOIL-FERTILITY, vii.- xi. 



spite of this, the bacterial counts showed a rise almost propor- 

 tional to the amount of naphthalene added. 



Experiment vi. 



The great bulk of the translucent colonies consisted of a small, 

 inert cocco-bacterium. 



Some pot-experiments were made with oats and maize, in soil 

 containing none, 0-001, and 0-005 per cent, of naphthalene; but 

 although the plants started somewhat better in the naphthalened 

 soils, the others soon overtook them, and ultimately there was 

 no difference. 



The conclusion arrived at, from these experiments, is that 

 while naphthalene induces an increase in the number of bacteria 

 in unmanured soils, there is no corresponding increase in the 

 formation of ammonia from the organic matter originally present 

 or added as dried blood. 



