ff GENERAL PBINCIPLES. 



ertlOihSf^tad one hundred, now upwards of one hundred and Rft^ 

 are known or designated. 



65. Many of these being rather natural families may be reduced 

 to about sixty -four great natural orders, including upwards of two 

 hundred natural families* 



66. Each natural family and order hat some qualities and pro* 

 perties, common to all theirgenera, and may therefore serve of 

 Medical Indication. 



SECOND SECTION-CIIEMICAI- I^RIXCIPLES OB 

 PRINCIPLES OF BOTANICAL CHEMISTRY. 



1. The knowledge of the s^ubstances which enter into the 

 bodily composition of Plants, form a branch of Chemical Sciences 

 called Vegetable Chemistry, 



2. This branch of Chemistry is intimately connected with Me- 

 dical Botany, and becomes an essential part of it. 



3. By it, the three Sciences of Botany, Chemistry, and Patho- 

 logy are rendered subservient to each other, 



4. Chemistry borrows from Botany the true inowledge of the 

 Plants, while Chemistry teaches Botany the nature of the Sub- 

 stances in these plants, 



5. The Medical Sciences receive from Vegetable Chemistry 

 the more intimate knowledge of the greatest proportion of Sub- 

 stances employed in practice. 



ii 



6. Chemistry acrjuires this knowledge by tests, analytical dC- 

 tompositions, and reaching the first Elements or elementary 

 bodies evolved in the plants. 



7. Vegetable life assimilates or produces nearly all the Naturri 

 Bodies andc^entes many Siibstanc«s peculiar to itself. 



8* Tliis is ihe foundation of three great Divisions or Classes io 



Vegetable Substances or their proximate Elements. 



Mine 



rals. 



2. Class. ANIMAL, foreign to Minerals, but common to 



Plants and Animals. 



3. PECULIAR. Not found either in Animals nor Minerals. 



