690 CONTKIBUTIONS TO OUR KNOWLEDGE OF SOIL-FEKTILITY, iv., 



which were made in the manner already described* : 20 grms. 

 of soil being moistened with 2 c.c. of suspension. The soils 

 were heated at 100°-105°C. 



Experiment xi. 



Experiment xii. 



Experiment xiii. 



* These Proceedings, 1910, p.813. 



