48 



On the Inorganic Constituents of Plants, 



Tubers and Haulm. Tubers. 



Fresh Tubers 7725 2154 121 Starchy fibre ... 685 



Drv Tubers 9465 535 Albumen . . .105 



Dry Haulm 8799 1201 Mucilage, Resin, Fatty matter, &c. . 333 



Water .... 7725-10000 



On comparing together the result of this series of Experiments, 

 it is evident that there are several discrepancies, which are probably 

 occasioned by local peculiarities in the plants which formed the 

 subject of experiment ; and that the trial was conducted on too small 

 a scale. The analyses have therefore not been carried out to that 

 degree of nicety which had been originally intended, as it was 

 determined to repeat the experiment on a larger scale, and with 

 a smaller number of simple saline manures. Several points, how- 

 ever, of considerable interest, are learnt, even by this experiment, 

 as to the relation which exists between the weight of the stems, the 

 proportion of earthy matter which they contain, the weight of the 

 tubers, and the proportions of their azotised and inorganic consti- 

 tuents. In the following Table some of these results are exhibited, 

 plants being arranged in the order of the weight of the stems. 



