Steam S'h;rii.iza i lox on W'ai r:R-S(iLri!LL: ^1atti:r in Soils. 271 



Growth of wheat plants on steamed soils ivhen planted four months after 



steaming. 



Baskets containing steamed and unsteamed soils that had stood in 

 the greenhouse for four months after steaming without having been seeded 

 but having been kept at optimum moisture content during that time, 

 were planted to wheat. This was done to see whether the decrease in 

 soluble matter that has been shown to take place on standing would affect 

 the germination and growth of plants. 



Fig. 78 — Millei following wheat on soils shown in Fig. 2. Showing change in relative 

 productiveness of soils six months after the former photograph was taken 



Vessel 5J — Soil No. i untreated 

 Vessel ^y — Soil No. 2 untreated 

 Vessel 61 — Soil No. i steamed 

 Vessel 63 — Soil No. 2 steamed 



Wheat seed was planted on February 26, there being about, but 

 owing to a mistake not exactly, 50 seeds in each basket. The following 

 is the record of germination : 



