68 
CONTRIBUTIONS TO ZOOLOGICAL PATHOLOGY. 
the lens of the microscope, we see these “ hematozaria ” floating 
in an undulatory manner amongst the blood globules, curving and 
uncurving themselves, and twisting and untwisting again, with 
great vivacity. 
To satisfy ourselves that these filaments existed in the whole 
current of the circulation, we have examined the blood of the 
coccygeal arteries, the external jugulars, the capillaries of the con- 
junctiva, of the buccal mucous membrane, of the skin, and of the 
muscles ; and in everywhere, in these structures, we were presented 
with these “ entozoaires.” Within twenty days we examined daily 
the capillaries of different parts of the skin, and the buccal mucous 
membrane ; and, without exception, there were constantly present 
many of these animals. The urine and excrementitious matters 
did not contain any of them. 
The diameter of the blood globules of the dog is from 0.007 
millimetre to 0.008 millimetre, whilst that of the hematoic ento- 
zooa is from 0.003 millimetre to 0.005 millimetre ; there cannot, 
therefore, be the smallest doubt but that the small filaments 
circulate with the blood wherever it passes. We estimate from 
many researches, made to assure us of the quantity of blood exist- 
ing in the vessels of dogs of middling size ; and where the dog was 
so treated, it yielded 1 kil. 500 gr. of blood from its circulation. 
But one drop of this blood, weighing 0 kil. 067 gr., afforded, regu- 
larly and ordinarily, from four to five of the entozaria : the dog, 
therefore, would have more than 100,000 of these filaria in its 
entire circulation. This prodigious number of these animals cannot 
but astonish us that the dog can still possess good health ; never- 
theless, we must remark, that the entozaria of its digestive tube, 
the tcenia , are also in great numbers, and with rarely any derange- 
ment of the vital functions. For twelve months we have examined 
the blood in seventy or eighty dogs, without meeting with the 
hematozaria ; and, to date from our discovery, we have searched, 
but in vain, in the blood of fifteen dogs. 
At the present time we have the honour of laying before the 
Members of the Academie, — 
1 . A drawing of the filaria of the blood of the dog ; 
2. Of the blood containing the living entozoa; 
3. The dog in which the blood is verminous ; and we offer, if 
the Academie desire, to make an incision into the upper lip of the 
animal, and shew, by the microscope, the circulation of the filaria 
in its blood. 
Edinburgh, Jan. 5, 1848. 
