PROGRESS OF VETERINARY SCIENCE AND ART. 79 
cation, when the food is returned to the mouth from the 
rumen 
Y\ ith reference to the sublingual saliva, Colin says that it 
is more dense and viscous than that of the submaxillary 
glands, so much so that it almost appears to be pure mucus. 
The sublingual gland secretes continuously and not alone, 
as Bernard has advanced, during the process of deglutition. 
The amount of the sublingual saliva is increased under the 
influence of excitants. 
M. Colin attempts to show that his results differ widely 
from those arrived at by Bernard, but I cannot see that 
there is any important or material difference in the opinion of 
the two experimenters, except as to the chemical action of 
the salivary secretion. 
Bernard has classified the salivary glands according to 
their physiological peculiarities, and this appears to me most 
rational, whereas Colin has adopted Duvernoy’s classification 
of these glands into an anterior and a posterior set. The 
anterior secrete the viscid secretion, and the posterior simply 
the watery fluid. 
Further experiments are required on the subject of the 
action of saliva on amylaceous food, and Colin says that its 
purely mechanical office cannot be admitted. The fact, that 
animals become emaciated, and get into a state of marasmus 
when affected with fistulae of the parotid ducts, indicates, 
according to Colin, a great change in the process of nutrition, 
and he is inclined to look on the condition as dependent on 
the incomplete changes of the food when not acted on by the 
salivary secretion. 
Development of Air in the Blood. — Stockfleth has 
described a peculiar case of development of gas in the 
blood of the horse, the remarkable features of which were 
analogous to such as have been witnessed in man according 
to the writings of Cless. The horse had been driven in 
harness, and was observed to be somewhat dull; on returning 
home his appetite was diminished, but still no decided disease 
presented itself. The following morning the horse was found 
dead in his stable, and no noise had been heard during the 
night. At midday the body was examined, and found fat, all 
the veins were filled with black fluid blood and air-vesicles ; 
besides which, ecchymoses existed in the mesentery, in the 
intestine, &c. On cutting into the liver and lungs, blood 
flowed out mixed with air. The right cavities of the heart 
were expanded and elastic on pressure, and on piercing them 
the air passed out with a hissing noise ; in the left side of 
