AGRICULTURAL TEXT-BOOK. 259 



stopped by the process of drying. The quantity of ircotine in the fresh. 

 leaves has been estimated at r ; in commercial leaves at to &quot; 



lOt OO IOWA) 



It varies according to the locality m which the plant is grown, rendering 

 it stronger or weaker, as follows ; (Schlosing .} 



Per eentopre in the dry leave?. 

 Department Elsas, (France,) 3.12 



Virginia, 6^7 



Kentucky, G.iig 



Per centaye in the dry leaves 



Department Lo r , (France,) 



Lot-Garoime, &quot; 7.34 



Nord. 6.5K. 



Ille Vilaine, &quot; 6.29| vtai-yland, 2 &quot;9 



Channel of Calais, &quot; 4.91 JHavanna, less than . 



Besides Nicotine, tobacco contains albumen, and a gluten-like substance, 

 gum, resin, malic, and citric acid. 



It has been discovered by the &quot;Tobacco Administration&quot; in Pans, 

 that the valim of tobacco btands in a certain relation to the quantity of 

 potash contained in tlwj ashes. Another striking fact wasalso disclosed. 

 Certain celebrated kinds of American tobacco were found gradually to 

 yield a smaller quantity of ashes, and their value diminished in thesame 

 proportion. ( Liebig Agricui. CJicm.) The large quantity of ammonia, 

 of lime, and the alkalujs required by this plant is the cause of its so rap 

 idly impoverishing the soil, while it supplies no material for the produc 

 tion of manure. The mode of cultivation, also, exposing the soil to the 

 evaporating effect of the hot sun undoubtedly adds to the evil. In rich 

 loams, where the solution of the minerals of the soil is rapid, and whera 

 10 to 20 per cent of vegetable matter is incorporated in the earth, to 

 bacco rmy be obtained for many years, but it is always an exhausting 

 crop. It has been stated, that a crop of tob icco removes, in less than 

 three months 470 Ibs. of mineral matter from one acre of land, without 

 estim.iting the silica. The important mineral ul*:ances presented in 

 H iva ma tobacao, were in 100 parts ashes: (#&amp;lt;?rf*0, in Licbitfs Anna- 

 len, April 1843.) 



S ilts of Po ash, - 31 J.^attsof Lime, - =, ?q 



Magnesia, - 4.09 Phosphates, . 904 



&quot;The total quantity of tobacco retained for English consumption in 

 1843, was nearly 17,000,000 Ibs. North America alone produces up 

 wards of 200,000,000. The combustion of this mass of vegetable mat 

 ter would yield abo it 340 000,000 Ibs. of carbonic acid gas ; so that the 

 yearly increase of carbonic acid gas from tobacco smoke alone cannot 

 be less than 1,000,000 Ibs ; a large contribution to the annual demand 

 for this gas made upon the atmosphere for the vegetation of the world.&quot; 



573. The manure for this crop should be such as can rapidly 

 and readily supply ammonia; for instance, guano, n 



