214 MOHR AND REDWOOD'S PRACTICAL PHARMACY. 
size of the book more than one-fourth, including about 100 
additional wood cuts. 
The first subject treated of is the general arrangement of 
the shop, or dispensary, the laboratory, the store-room, &c, 
and the succeeding chapters are devoted to the considera- 
tion of the various apparatus and manipulations necessary 
in pharmaceutic processes. Such as weighing and mea- 
suring, ascertaining specific gravities, use of thermometers, 
hydrometers, &c. ; the construction and use of furnaces and 
other methods of applying heat ; the mechanical contrivances 
for the comminution of drugs, such as mortars, cutting- 
knives, drug mills, &c. ; filters, the clarification of liquids, 
the decolorization of syrups and oils ; the construction of 
lever, hydraulic and other presses ; evaporation; distillation; 
sublimation ; the preparation of tinctures, extracts, syrups, 
capsules, pills, &c. ; the purification of the fixed oils and 
fats used in pharmacy ; the preparation of ointments, 
plasters, &c; various miscellaneous operations, such as stop- 
pering bottles and removing fixed stoppers, connecting and 
luting apparatus, working in glass, covering glass flasks 
with copper by galvanic deposition ; the dispensing of medi- 
cines, and extemporaneous pharmacy. 
The additions of the American editor are important, 
forming by no means the least valuable portion of the work. 
Nearly the whole of Chapter 12th, on the subjects of subli- 
mation calcination, destructive distillation, &c, is original 
with him, as also the whole of Chapter 14th, on the impor- 
tant subject of the preparation and purification of the fixed 
oils and fats used in pharmacy, and on cerates, ointments, 
soaps, and plasters, besides numerous additions interspersed 
throughout the book. He has also added a chapter on the 
apparatus for testing, the re-agents necessary, and the 
methods of ascertaining their purity, taken from Bowman's 
Practical Chemistry, and a useful table of solubilities, com. 
piled chiefly from Henry and Guibourt, &c, increasing 
greatly the practical value of the work to the pharma- 
ceutist. 
