AGRICULTURAL TEXT-BOOK. 



199 



6.8 on clay to 17.6 on &quot;black land;&quot; while the nitrogen in tho 

 fibre, and the nitrogen in the juice, equally uncertain, appear to 

 bear no relative proportion to each other. 



440. Organic analysis of Swedes. (Johnston.) 

 Albumen, ..... 3.5 



Fat and oil, .... 2.0 



Gum, Dextrine and pectiue, 14.9 



Sugar. ..... 58.9 



Fibre and husk, ..... 20.3 



&quot; The potato is characterised by containing a large propor 

 tion of starch in connection with a small quantity of albumen 

 the turnip and carrot by containing in place of the starch a 

 variable proportion of sugar, and of a gelatinous gummy-liko 

 substance, to which the name of pectin has been given. In 

 the Swedish Turnip and in the carrot the pectin is usually pre 

 sent in the larger quantity.&quot; (Johnston.) The same writer 

 gives the following comparative table; remarking, however, 

 that &quot; these analyses are very defective, and apply with any de 

 gree of correctness only to the specimens actually operated on. w 

 They will answer, at the same time, to give a general view of 

 these plants. 



Variety of Turnips. 



441 . Average of water (A.) and ash (B.) in turnips grown in 

 England, ( Way and Ogsden.) 



