Dr. North on Fuel, 7k 
_ How it may be with regard to the degree in which the com- 
bustion just mentioned, may be more wholesome, is pie for 
others to determine. But one who furnishes that sort of 
pleasure or. comfort, Tomine receive a higher eh al 
if not a greater reward from his guests, than one who warms 
them with iron stoves, carbonic fires, or heated air only. Con- 
siderations. is sort should have an influence in re 
the different value of the various kinds of fuel, and come into 
consideration with re to the different modes of burning 
them. Those who direct the employment of capital, and la- 
bour in procuring fuel to supply the public wants, shone a 
cure eyery sort in proper quantity, and each of 
mination not to give it a higher character than it deserves. 
The opinion he has formed respecting iss nuility,, has been 
operations of ‘nature, caloric has a two-fold effect upon the athoaphere. +a 
y 
of caloric ae oxygen, Sectiposss s hydrogenous bituminous mat- 
ter saaee easily, i. e. at a lower temperature, than is the case 1 the more 
t us matter. The reader will now understand 
why the term carbonaceous state of air ~~ been a That a bitum 
state of air is proper to come in close contact with animal bodies, is render- 
ed highly probable by the circumstance, iat liients: in general, as well as 
man, are clothed in bituminous matter, or matter which contains that prince 
ple, if hair, wool and feathers may be regarded as clothing. ituminous 
c i w much in use, sedentary people sliould 
pinnae ~ oe if others do not, because they live during the winter 
in of those kinds of air. Those who ma, 
that th tthe iis “expressed in th in this note and text, st — theoretical, are rem 
the g for the benefit of "a6 
however, of difierent persens, = . re of | 
ache and other oppressive effects om carbonic fires, than others. Nega- 
tive testimony, however, weighs oo than that which is positive. Should 
attempt to explain the reason why some fires are more c comfortable than 
others, fail to be satis chemical experiments on the subj 
have been » by the writer ; he e cting the existence of 
the attempted to lained. By the by, chemical ‘is often 
too imperfect to explain physiological facts. iter has paid pe actg 
tention to the differ tion produced on his own body, by differen 
fires, he believes the testimony of others - attention is turned 
toward the sabject, will ultimately confirm that which he has given. The 
is more solicitous to éstablish such a medical fact, 
writer i 
than a chemical theory, because the Che mamma cama 
comfort, if not health, than the fatter 
