25 
a general character; the circumstances which may 
convert the one into the other considered. The pe- 
viod of life, the state of the system, the sex and 
. eccupation or habits of the patient, which all to- 
gether conspire, or separately tend to modify or 
change, the impetus, force, and permanence of 
local stimulants. 7 
The danger of employing them without refer- 
ence to these circumstances. = : 
The necessity of a knowledge of the principles 
of elementary and medical chemistry, in order to 
Jead to a knowledge of the incompatible substan- 
ces improper to be administered with the chemi-_ ; 
cal remedies as refrigerants, antacids, lithontriptics 
and escarotics. 
The utility and importance of a knowledge of 
the anatomy and physiology of the viscera, to un- 
derstand the art of prescribing the mechanical 
remedies with propriety and effect. 
