By Edward Solly, Esq. 



191 



It is worthy of note that in examining this series of plants it was 

 observed that the young roots for the first two weeks contained 

 small traces of Nitric acid, whilst for the three first weeks the leaves 

 contained a very large quantity ; in the third and fourth week the 

 roots contained a considerable portion of Nitric acid, but after that 

 little or none could be detected ; from the fourth to the eleventh 

 week the leaves also contained a considerable quantity, but during 

 the three last weeks of the experiment the leaves like the roots 

 were quite destitute of any Nitrates. 



At the same time with these experiments a similar examination 

 was made of the experimental Mangel Wurzel roots, which formed 

 the subject of the experiment already described (p. 86 of this volume). 

 The following is the relative composition of this series of plants. 



