248 PEINCIPLES OF GARDENING. [CH. VIII. 



but this distinction is now admitted to fail ; for 

 although in the former it is usually most abundant, 

 yet later researches shew it to be present in all 

 seeds, it is abundant in yegetable gluten, and per- 

 vades the whole frame of the tobacco plant, yet is 

 absent from some animal substances. 



If we follow the above-named chemical bodies 

 through their combinations, we shall find that the 

 similarity between animals and plants still obtains, 

 and are equally numerous and intricate in each. 



Of the acids there are contained in 



Animals, Vegetables. 



1. Sulplumc, 1. Sulphuric, 



2. Phosphoric, 2. Phosphoric, 



3. Miuiatic, 3. Muriatic, 



4. Carbonic, 4. Carbonic, 



5. Benzoic, 5. Benzoic, 



6. Oxalic, 6. Oxalic, 



7. Acetic, 7. AcetiC; 



8. Malic, 8. Malic, 



besides others still more numerous, peculiar to 

 each. 



Of the earths and alkalies, lime, magnesia, silica, 

 soda, and potass are found in both classes ; and of 

 the metals, iron and manganese are their conjoint 

 constituents. If we follow the two orders of organized 

 creatures through their more compound constituents » 



