26-1 llORTUS GRAMINKUS WC lU: K N KN S i S. 



starch and gluten ; while barley, peas, and turnips, contain 

 a greater pioportion of saccharine matter, which is wanting 

 in wheat: and are consequently best qualified to precede or 

 follow that grain, in alternation with green crops. Oats, 

 rye, and beans, afford nutritive matters smiilar to wheat, 

 though in less proportion ; and a crop of either of these will 

 have a like effect on the soil to that of wheat, though in a 

 less degree, but totally different from those of barley, peas, 

 and turnips.. The former plants, therefore, as they impove- 

 rish the soil only for an intermediate succession of themselves, 

 may be termed pa/Ym/ impoverishers ; and the latter, exhaust- 

 ing the land for themselves, as well as, in a degree, for 

 every other kind of vegetable, may be called general impo- 

 verishers. 



If the nutritive matter of the following plants be exa- 

 mined with this view, they will be found to rank either as 

 general or partial impoverishers. 



General Impoverishers. Partial Impoveiislieis. 



Oats. Wheat. 



Rye. Peas. 



Potatoes. Beans. 



Carrots. Turnips. 



Mano-el-wurzel. Clovers. 



Cabbaa'es. Sainfoin. 



Kohl-rabi. Lucern. 



Bunias Orientalis. Grasses, when mowii. 



It does not fall within the limits of these pages to give 

 an account of all the plants employed in the Alientale 

 Husbandry y but only of such as have been more particularly 

 submitted to experiment in this series. There have been, 

 however, several plants of this class made trial of, with 

 respect to the quantity of nutritive matter they contain, 

 some account of which will be found in the following- 

 pages. 



TRIFOLIUM niacrorhizum. Long-rooted Clover. 



Sjjecijic character: Legumes racemed, naked, one seeded. 



