ANALYSES OF THE POTATO, 51 



XVI. ANALYSIS OF THE ASH OF THE YOUNG POTATO VINES (Early Shaws). 



I separated the leaves from the stem, in conformity with the method I have usually 

 pursued in the analysis of similar substances. 



1. Analysis of the leaves. 



Quantity of ash used, 20 grs. 



Per centum. 



Silica ....... 5'500 27-500 



Phosphates ■ - - - - - 4'090 20-450 



Carbonate of lime 2,599 12-995 



Magnesia - - - - - - 0-230 1-156 



Potash 1.570 7-850 



Chloride of potassium .... 2-061 10-305 



Chloride of sodium - - - - 1'850 9-250 



Sulphuric acid - - - - - 0-448 2-240 



Carbonic acid ..... 0-731 3"655 



Soluble silica 0-260 1-300 



Organic matter ..... 0-231 1-155 



97-850 



2. Composition of the phosphates. 

 Phosphates - - - - - - 4 -09 



Phosphate of peroxide of iron - - - - 0*90 



Lime - - - - - - - - - 73 



Magnesia - - - - • . - • 2-08 



Phosphoric acid - - - - - - 1-28 



4-09 



XVII. ANALYSIS OF THE ASH OF THE POTATO STEM (Early Shaw). Effervescent. 



Per centum. 



Silica - 5-000 



Phosphates - - 13-000 



Carbonate of lime 11-700 



Magnesia ....... 0-560 



Potash ........ 20-740 



Soda 2-000 



Chloride of potassium ..... 34-960 



Sulphuric acid • 4-000 



Carbonic acid ...... 9-032 



100-992 



