STUDIES ON SOIL PROTOZOA 



167 



TABLE XXVII 



(Effect of toluene, CS2 and CHCI3 upon the soil protozoa {one month after treatment) 



C = Ciliates; F = Flagellates; A = Amoebae. 



were treated with 1 per cent toluene but not evaporated. As 

 is shown in Table XXVIII the results after one month were 

 similar to those obtained in the other experiments. 



TABLE XXVIII 



Effect of toluene left in and evaporated upon the soil protozoa {one month after 



treatment) 



Another test was made in which large amounts of volatile 

 antiseptics were used in order to see if the protozoa could be 

 entirely eliminated from soil. Soils were treated with 5 and 10 

 per cent of toluene and carbon bisulphide and the antiseptics 

 left in the soil. Even with such large arnounts of antiseptics 

 the protozoa were not entirely eliminated, although the fauna 

 was considerably simplified, especially with carbon bisulphide. 

 As is shown in Table XXIX, ciliates, flagellates and amoebae 



