218 AGRICULTURAL TEXT-BOOK, 



In this analysis of the stalks, the carbon and nitrogen are piobablj 

 rated too low. It will be observed that these tubers are almost identical 

 in composition with the potato, the only essential difference being a lit 

 tle more ash in the first. According to the same writer, 30.8 Ibs. of Je 

 rusalem Artichokes are equal to 11 Ibs. hay, as food for horses. &quot; These 

 roots are excellent food for the borse ; they are eaten greedily, and he 

 thrives upon them.&quot; 



472. Proximate analysis of tho tubers of the Jerusalem Ar 

 tichoke. (Braconnot.) 



Uncrystallizable Sugar, ... 14.80 



Inuline, - - 3.00 



Gum, ... 1.22 



Albumen, - - - 1.00 



Fatty Matter, - - 0.09 



Citrates of patash and lime, - - 1.15 



Phosphates of potash and lime, ... 0.20 



Sulphate of potash. - - -012 



Chloride of potassium, - 0.08 



Malatcs and tartrates of potash and lime, - - 0.05 



Woody fibre, - 1.22 



Silica, .... 0.03 



Wate., - - 77.05 



M. Pnyen found a larger proportion of Sugar in this tuber than that 

 stated above, and he ascertained that the fatty matter consists of stear- 

 inc and elaine. 



Boussingault found : 

 Of dry matter, 20.8 | Water, 79.2. 



473. Inorganic analysis of the tuber of the Jerusalem Arti 

 choke. (Boussingault,) Per cent-age of ash in dry state 6.00. 

 Potash, 54.67 



Soda, ... - traces 



Lime, - - 282 



Magnesia, - - - - 2.21 



Oxide of iron, alumina, &amp;lt;fcc., - 6.39 



Phosphoric acid, - - - 13.27 



Sulphuric acid, .... 2.70 



Chlorine, - - l- 9 7 



Silica. - - 15.97 



It will be observed ho\v rich in phosphoric acid this plant is, 



