BOTANIC PHYSICIAN. _ 
OD — important in a pharmaceutic point of view, as sO many 
of them are employed im medicine. The vegetable kingdom, in 
particular, furnishes by far the greater part of the articles of the 
_ The substai which are the products of organization, are very 
in their chemical characters from those belonging to the 
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Case is extremely different. If we are able to detect their compo- 
nent principles, we can scarcely determine their proportions ; much 
less are we able to ascertain the mode in which they are combined. — 
1 no instance, therefore, does the analysis enable us to combine 
iples, whether proximate or ultimate, which we have obtain- 
‘ed, so as to form any compound at all resembling that which has 
_ been analyzed. These productions, too, consist of a few principles, 
chiefly of carbon, hydrogen, and oxygen, with the addition of azot: 
_ and phosphorus in the animal kingdom, while the compounds be-' 
longing to the mineral kingdom are move varied in their compositien- 
The products of organization are likewise distinguished by sus-— 
ceptibility of decomposition. Their principles, having strong mu- 
tual attractions, are disposed to react on each other ; and if this be — 
favored by humidity, or slight increase of temperature, new combi- — 
nations are formed, whence the original compounds are destroyed. — 
__ In the analysis of these substances, it is nece 
not much exceeding that — 
r volatile principles, tends 
not merely to separate, but actually to decompose. them. eoer 
essary, therefore, that the temperature should not exceed 212° of 
along with the aqueous vapor. ina 
OF the different chemical agents useful in the vegetable analysi 
water dissolves the gummy and extractive parts, the saline su! 
stances, and several other principles of inferior importance, Ale: 
