32,6 Dr. guthrie on the Ruffian Manner of 
ciple emitted from burning charcoal, or by the in- 
cruftation formed upon the inlides of the boors huts 
when it thaws. 
People of condition in this country have double win- 
dows to their houfes in w'inter; but the commoner fort 
have only fingle ones, which is the reafon that, during a 
fevere froft, there is an incruftation formed upon the in- 
lides of the glafs windows. This feems to be compofed 
of condenfed breath, perfpiration, 8ec. as a number of 
people live and lleep in the fame fmall room, elpecially 
in great cities. This excrementitious cruft is farther im- 
pregnated with the phlogifton of candles, and of the 
oven with which the chamber is heated. 
When a thaw fucceeds a hard froft of long duration, 
and this plate of ice is converted into water, there is a 
principle fet loofe, which produces all the terrible effects 
upon the human body which the principle emitted from 
charcoal is fo well known to do in this country, where 
people every day fuffer from it. Plowever, the Ruffians 
conftantly lay the blame upon the oven, when they are 
affedted by the thawing of the cruft, as the effedts are 
perfedtly iimilar, and they cannot bring themfelves to 
believe, that the diflolving of fo fmall a portion of ice 
can be attended with any bad confequence, when they 
daily melt larger maffes without danger: yet the oven 
does 
