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yEIGHTS AND MEASURES. 
USED IN WEIGHING; MEDICINES, &c. 
are two kinds of weights received in common use, by one 
old and silver, and by the other, nearly all kinds of mer- 
im _ In medicine, the former (Troy weight) is 
hich nd is divided as follows: 
os The Pound, #& Twelve ounces. Z 
. Ounce, Eight drachms. 3 
Drachm, Three scruples. 9 
Scruple, Twenty grains. gr. 
_ "The signs are added by which the several weights are denoted. 
To oxi the quantity of tiquids, measures are employed which 
_ are derived from the wine gallon, and for medical purposes, it is di- 
athe following manner: 
‘The gallon, -). = (Hight pints. pt. 
ac Eight fluidrachm. f3 | 
The fluidrachm, Sixty minims. 1 
Acid, alkaline, earthy, and metallic preparations, and salts of all 
kinds, should be kept in glass stopped bottles. 
The degree of heat is measured by Fahrenheit’s thermometer, and 
when a boiling heat is prescribed, it is that which is marked by the 
212th degree. A gentle heat is between the ninetieth and hundredth. « 
oe 
contains 
Mepicat Prescrirrions. : 
The principal objects designed to be attained by the composition 
of medicines, are, to communicate an agreeable taste and flavor; to 
to give a convenient form ; to correct the operation of the principal 
medicine, or obviate some unpleasant symptom it is liable to produce ; 
to promote its action, by the additional article exerting one of a simi- 
lar kind; to obtain the joint operation of two remedies, having dif- 
_ ferent powers ; or to alter their usual effects, by the power which or 
y have of modifying the action of the other. coe 
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