658 CONTRIBUTIONS TO OUR KNOWLEDGE OF SOIL-FERTIMTY,vi., 



slowly dried; the figures obtained after the forty-fourth day are, 

 therefore, not recorded. In the later experiments, the bottles were 

 weighed, and the loss of water made up from time to time. In the 

 last experiments, the loss of moisture was avoided by using corks 

 fitted with a short piece of glass-tubing, terminated with an open 

 point of about 1 mm. bore. 



Experiment i. — The Addition of Protozoa. 



3 



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