A, 
38 On Respiration and Animal Heat. 
other gas, agreeably to the principle of pres 
sure established by Dr. Henry. But the 
quantity of gases thus interchanged was too 
large in some of the instances to admit of 
this explanation, ‘unless there was some inac- 
curacy in the experiment. 
The. above accurate deyeriendeidilatiies 
not yet published any enquiry concerning the - 
quantity of steam or aqueous vapour produced 
by respiration.’ ‘If they should think the the- 
oretical determination in the preceding pages 
insufficient, namely, 141b. im a day per man, it 
is to be hoped they will endeavour to ascer- 
tain the facts expermentally, being well qua- 
tified for the purpose. and having an apparatus 
superior to most or all of their predecessors in 
this department of science. 
From these additional remarks, it with be 
understood, that the leading principles of 
Crawford’s theory of animal heat remain yet 
in nearly the same state in which he left. them. 
Several of his ‘subordinate facts have been 
either corrected or ascertained with greater 
precision ; for instance, the proportion of ecar- 
bone and oxygen in carbonic acid, which he 
deduces as 1:4, has been found as 1: 2,6; 
the change made in respiring common air has 
been found to resemble that made by burning 
eharcoal rather than wax; the quantity of the 
