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JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



rows or under the shade of trees? Many similar queslions can be asked, 

 but we are very far from being in a position to supply the answers. 



With such positive results before us of the association of particular 

 plants with differences in the chemical treatment of the soil it would 

 seem not unreasonable to expect that an analysis of a plant and of the 



PIct 'J 4-18 7 5 17 4-2 9 II 14 



Fig. 5. 



The vertical columne show the percentage of Festuca ovina in the herbage 

 of the plots numbered below, the manuring of which, was as follows : — 



Plot 3. — Unmanured. 



Plot 4-1. — Superphosphate only. 



Plot 8. — Superphosphate, Magnesia, and Soda; no Potash. 



Plot 7. — Superphosphate, Magnesia, Soda, and Potash. 



Plot 5. — Nitrogen only as Ammonium Salts. 



Plot 17. — Nitrogen only as Nitrate of Soda. 



Plot 4-2. — Ammonium Salts and Superphosphate; no Potash. 



Plot 9. — Complete manure. Nitrogen as Ammonium Salts. 



Plot 11. — Complete manure. Nitrogen as Ammonium Salts in excess. 



Plot 14. — Complete manure, Nitrogen as Nitrate of Soda. 



soil in which it usually grows might reveal the presence in both of 

 some common substance which accounts for their association. An 

 analyst, indeed, is not infrequently asked to examine a particular soil 

 and determine what is lacking in order to fit it for the growth of this 

 or that plant. As soon as that is attempted, however, certain difhcul- 



