I V 2 1 
tvhieh were fucceeded by a complete apy- 
rexia, became continued as in the epi¬ 
demic in London An. 1678. 
It is particularly in autumn, and during 
great heat that fevers vary their type and 
character. This proceeds from a change 
which the conffitution of forne individuals 
experiences under thefe circum(lances, and 
not from any alteration in the nature of 
the miafmata. As a proof, the Peruvian 
bark is a fpecific for a quotidian fever, as 
well as for a tertian, quartan, or thofe of 
longer periods, and in continued itfelf, or 
other difeafes of the fame clafs. 
What we have faid of intermittents, 
may alfobe applied to other acute difeafes, 
which take on different forms under dif-s 
ferent circumflances. The epidemic fevers 
in London in the years 1667, 68, and 
part of 69, were] the fame difeafe with- 
the fmall-pox, which reigned at the fame 
time, and both gave way to the fame 
remedies. 
