OXIDATION OF THIOSULPHATES 83 



Exercise 4 

 Oxidation of Thiosulphates 



1. Place in four flasks (300-0.0. Erlenmeyer) about 20 

 c.c. each of Nathansohn's solution (m. 60). 



2. Inoculate two flasks with o.i gram of soil each. 

 Leave two flasks uninoculated. 



3. Incubate for four weeks at 28 C. 



4. Remove the flasks from incubator and test for sul- 

 phates. 



