Total 



27-82 



192 



POT-CULTURE EXPERIMENTS, 1910-11-12. 



I. Hills' Experiments : — 



(a) The influence of Lithium Salts on Wheat. 

 (h) The influence of Zinc Salts on Wheat, 

 (c) The influence of Lead Salts on Wheat. 



II. The relation of Lime to Magnesia in Soils. 



(a) The addition of Magnesia. 

 (6) The addition of Lime. 



I. The Hills'' Experiments — (a) The infiuence of salts of 

 Lithium on Wheat. 



For several years past the Woburn Pot-culture Station has 

 been concerned in the investigation of the influence on plant 

 life of some of those constituents which are onlj' occasionally, 

 or only in minute quantities, found in the soil. These investi- 

 gations are the outcome of a Bequest made in 1896 by the late 

 Mr. E. H. Hills, who freely stated his belief that these " rarer 

 constituents" exercised a greater influence than was generally 

 supposed. On the Society undertaking the work in accordance 

 with the terms of the Bequest, consideral)le doubt was expressed 

 as to whether any results of value were likely to be obtained. 

 The work has, however, been diligently pursued, and the 

 following account will, no doubt, show whether the pessimistic 

 forecast, or, on the contrary, that of Mr. Hills, was the more 

 correct. Suffice it to say, meantime, that, as the work has 

 proceeded, points both novel and unexpected, and conveying 

 interesting and valuable information have been brought out. 



While many different substances coming under the heading 

 " rare constituents " have been examined, there are some in 

 particular which have been more closely followed than others, 

 and amongst these come the salts of lithium. The information 



