DURING THE PROCESS OF DIGESTION. 
161 
an inferior development; which, digested in their turn, furnish 
animal matters to the general nutrition of these herbivorous 
quadrupeds. 
In the dog and pig, which derive their nourishment from animal 
and vegetable substances, the animals are small, of one or two spe- 
cies only, and are seen in very few numbers. — ( Comptes Rendus ; 
also, The London Physiological Journal , No. 5.) 
THE VETERINARY ART IN INDIA. 
By J. Grellier, Esq., M.R.C.S. 
[Continued from p. 19.] 
Glands are situated in almost every part of the body, for the 
purpose of what is generally termed secreting the various fluids 
from the blood, as urine by the kidneys, the bile by the liver, 
saliva by the salivary glands, semen by the testes, &c. 
The property of secretion by the means of glands has been much 
doubted. A secretion implies that the fluid secreted exists in the 
blood : but this is not the case ; for most of the fluids produced by 
the glands are not to be found in the bowels, which, I think, is a 
demonstrable argument against the elective property of glands; 
for the late opinions favoured the theory of appetency in the glands 
and lacteals. Many arguments have been adduced to prove the 
impossibility of appetency, or a desire existing in glands and lac- 
teals to choose their own peculiar fluid ; but the non-existence of 
these fluids in the blood is, I imagine, sufficient to entirely expunge 
this theory. 
To the discovery of elastic fluids we are indebted for a probable 
explanation of this very important part of physiology. The blood, 
although it does not contain the respective fluids produced by the 
glands, yet does contain the elementary parts of which every fluid 
in the body is composed; there consequently remains but one 
mode of production, which is the separating from the blood these 
elementary parts, or rather decomposing the blood, and recom- 
posing the divided parts by various combinations into the fluids 
produced by the glands ; for I again observe, that every part of 
the animal frame, whether solid or fluid, is composed of the same 
principles, combined in various proportions. 
This mode of operation in glands, I think, may be supported 
by many of the natural phenomena. The chyle of graminivorous 
and carnivorous animals, we should imagine, must be very opposite 
in their properties, as the one feeds on vegetables and the other 
VOL. XVII. Y 
