658 CONTKIBUTIONS TO OUR KNOWLKDUE OF SOIL-FERTII,lTy,vi., 



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

 therefore, not recorded. In tlie later experiments, tiie bottles were 

 weiglied, 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 witli an open 

 point of about 1 mm. l)ore. 



ExPERiMKNT i. — The Addition of Protozoa. 



D^^.d "^^.'lato'so-a 



6 \^ 10 ^7 



^3 ciocuv 



