LXXII APPENDIX. 



bumen, sugar, and mucilage, and less nutritive in pro- 

 portion, as they contain other substances. 



In comparing the composition of the soluble pro- 

 ducts afforded by different crops from the same grass, 

 I found, in all the trials I made, the largest quantity 

 of truly nutritive matter, in the crop cut when the seed 

 was ripe, and least bitter extract and saline matter; 

 most extract and saline matter in the autumnal crop; 

 and most saccharine matter, in proportion to the other 

 ingredients . in the crop cut at the time of flowering. 

 I shall give one instance: 



10O parts of the soluble matter obtained from 

 the Dactylis glomerata, cut in flower, afforded 

 of sugar - 18 parts 



of mucilage - 67 



of coloured extract, and saline matters, 

 with some matter rendered insoluble by 

 evaporation 15 



100 parts of the soluble matter from the 

 seed crop afforded 



Sugar - 9 parts 



Mucilage - 85 



Extract, insoluble, and saline matter 6 

 100 parts of soluble matter from the after-math 

 crop give 



of sugar - 11 parts 



of mucilage - 59 



of extract, insoluble, and saline matters 30 

 The greater proportion of leaves in the spring, 

 and particularly in the late autumnal crop, accounts 

 for the difference in the quantity of extract; and the 



