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[ 576 ] 
proper. But when the peripneumony is of a mixed 
kind ; when the lungs are not fo much inflamed 
as loaded with a pituitous matter ; when bleeding 
gives but little relief ; when the pulfe, tho’ quick, 
is fmall ; when the patient is little able to bear evacua- 
tions, and the difeafe has continued for a confiderable 
time ; in all thefe cafes bliftering will produce re- 
markable good effe&s, and, far from increafing, will 
generally leflen the frequency of the pulfe, and fever, 
more fpeedily than any other remedy. 
On the ocher hand, when the fever and frequency 
of the pulfe proceed from a true inflammation of the 
lungs, from large obftnnftions tending to fuppuration, 
or from an open ulcer in them, blifters will be of 
lefs ufe, nay, fometimes will do harm, except in the 
lad cafe, where they, as well as iflues and fetons, 
are often beneficial, tho’ feldom able to compleat a 
cure. .But as in pituitous infar&ions of the lungs, 
with cough and fever, repeated blifters applied to the 
back and Tides are far preferable to iflues or fetons, fo 
thefe laft feem moft proper in an open ulcer of the 
lungs. The former make a greater and more fudden 
derivation, and are therefore adapted to acute cafes; 
the latter a<ft more flowly, but for a much longer 
time, and are therefore beft fuited to chronic dil- 
eafes. .Further, while blifters evacuate chiefly the 
ferous humours, iflues and fetons generally difeharge 
true purulent matter, and on this account may be of 
greateft fervice in internal ulcers. 
In what manner blifters may leflen the fever and 
frequency of the pulfe attending internal inflamma- 
tions, I have elfe where endeavoured to explain (2); 
(2) Phyfiological Eflays, p. 69. 
and 
