to the Eartln/ Constituents presented to their Absorbing Surfaces. 2(i 1 



of the plant which had been above the surface of the soil were separated, so 

 that these at least might be considered free from any ingredients, except such 

 as constituted integrant parts of its actual composition. 



The several portions of these respective samples having been weighed, re- 

 duced to ashes, and examined in the usual way, the results were obtained in- 

 dicated in the following Table, in which the stem, leaves, and flowers are 

 comprehended under the head of "Parts above ground"; the roots and seeds 

 which had not germinated, under the head of those " under ground". 



The aqueous solution consisted chiefly of potass combined with the carbonic 

 or phosphoric acids, together with a slight admixture of sulphate of lime, 

 whilst the portion which the acid dissolved was chiefly composed of an earthy 

 carbonate and phosphate. 



Now I satisfied myself, by a minute examination, that the acid solution de- 

 rived from the stems contained no trace whatever of strontian, although a 

 small portion appeared to be present in, or at least adherent to, the roots. 



2 M 2 



