COOLNESS OF THE BLOOD. 7 
moval of all inclination to fever, which is 
otherwise continually accumulating, and of 
which the uniform companion is_ bodily 
weakness, and depression of spirits. Again, 
the mechanical cause of a fresh colour (and 
this, by the way, is literally a cool colour; 
for I am not speaking of the flush of fever, 
but of a healthful rosiness,) is the passage of 
the blood into the very small vessels which 
intersect the skin. You are to know, too, 
that the blood is a compound fluid; or, that, 
strictly speaking, the fluid itself is white, 
and that its red colour is produced by the 
red globules with which it is filled. Now, 
it depends upon that activity of the heart, 
which itself, as I have said, depends upon 
the limpid and other healthful qualities of 
the blood, acquired by its communication 
with cool and invigorating air in the lungs, 
and also upon the limpidity of the blood 
itself, whether or not the red globules can 
be forced, at each beating of the heart, into 
the fine vessels of the skin, or whether only 
the white blood, strained of the globules, can 
find room to enter. But I think that I need 
not tax myself farther, to rake up the little 
