COMPOSITION OF GREEN RYE AND RAPE. 7 



drying on the water-bath, its weight was determined on the balance. 

 It is essential to examine carefully the residue which is left on 

 evaporation of the first ethereal liquids, for commercial ether 

 always contains some water and alcohol, which both dissolve a 

 small proportion of sugar from the vegetable substance which is 

 treated with such ether. 



7. Determination of the whole amount of protein compounds, 

 or flesh-forming constituents. In order to ascertain how far the 

 direct determination of albumen, and that of the insoluble protein 

 compounds obtained by combustion, agreed with a total determi- 

 nation of the protein compounds, about 20 grains of the dried sub- 

 stance were burned with soda-lime in a combustion-tube ; and the 

 amount of nitrogen obtained, by following the method of Will and 

 Varrentrapp, being multiplied by 6J, gave the proportion of pro- 

 tein compounds in young rye and rape. 



Having thus described briefly the method according to which 

 the organic analyses were executed, I shall now proceed to state 

 the results obtained in the analyses of both green foods. 



I. COMPOSITION OF GREEN RYE. 



Water. (1.) Dried in the air-bath, at 220 F. ; green rye lost 

 79.58 per cent of water. 



(2.) In another determination, 79.23 per cent of water were 

 obtained ; on an average, green rye thus contained 79.405 per cent 

 of water. 



(3.) Another sample, taken from the field some days after the 

 two preceding ; 75.423 per cent were found. 



Ash. (1.) 250 grains of fresh rye, on burning, gave 4.44 grains 

 of ash, or 1.778 per cent; or 8.633 per cent of ash in the dried 

 substance. 



(2.) In the sample of rye, which was analysed some days after 

 the preceding, 1.57 per cent of ash were found. This ash was dis- 

 tributed amongst the different constituents of rye as follows : 



Ash in cellular fibre, ..... .418 



gum and pectin, ..... .572 



sugar, ...... .368 



albumen, . . . . . . .180 



1.538 



These separate determinations of ash agree as closely as possible 

 with the total determination of ash.^ 



Protein compounds. (1.) By 'separate determinations there 

 were found 



Soluble albumen, . . 2.357 with .3771 of nitrogen. 



Insoluble protein compounds, . .736 .1178 



3.093 .4949 



(2.) In the sample taken some days after the preceding, the 



