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Fig. 2. Photograph showing the action of copper sulphate on barley in the presence 

 of nutrient salts. (March 5th April 19th, 1907.) 



1. Glass distilled water. 



2. Copper distilled water. 



3. 1/1'2,500 copper sulphate. 



4. 1/25,000 



5. 1/50,000 

 11. 1/100,000 

 7. 1/250.0UO 

 s. 1/500,000 

 9. 1/1.000,000 



