500 
DIFFUSED TUBERCULAR DEPOSITIONS. 
filaments of the membranes, and to the heart’s substance. 
These membranes were there placed by nature that on opening, 
as the heart dilates, they should let the blood enter from the 
great vein (vena cava) into the right ventricle, and when the 
heart contracts, by closing the aperture, prevent that the 
blood entered therein by the great vein should not return from 
the arterial vein, and re-enter the great vein. The membrane 
which is at the second opening of the right ventricle, where 
is attached the arterial vein, is not simple, but divided into 
three distinct ones. ........ 
These three membranes allow the blood to flow 
through the arterial vein to the lungs, and prevent that the 
blood should regurgitate into the left ventricle when this 
dilates. Almost in the same manner as with the first aperture 
in the right ventricle, is another membrane at the correspond- 
ing opening in the left ventricle, from which arises the venal 
artery, except that it is not divided into three parts but only 
in two; they are very wide above, and pointed below, their 
apices coming further down in the left than what is seen in 
the right ventricle, and the membranes are large and stronger 
in the left than in the right. The one membrane occupies 
the right side of the ventricle, and the other the left. Their 
office is when the heart dilates to allow the blood and the 
spirits to enter the left ventricle from the venal artery, and 
when the heart contracts to prevent that blood returning into 
the venal artery. To the three membranes of the second 
orifice of the right ventricle correspond the three which are 
placed at the mouth of the second hole of the left ventricle, to 
which is attached the great artery ; the great artery being 
larger than the arterial vein. These membranes, when the 
heart contracts, on opening, allow the vital spirit with the 
blood to flow out, and go with impetus into the great 
artery ; and when the heart dilates, they prevent, by closing 
the aperture, that the spirit and the blood re-enter the 
ventricle.” 
CASE OF DIFFUSED TUBERCULAR DEPOSITIONS. 
By T. Stanley, M.R.C.V.S., Edmonton. 
Dear Sir, — On the 22 d of February last, I was re- 
quested by a gentleman, living in Hertfordshire, to see an 
aged brown gelding, used for hunting, which had a deep- 
seated abscess near the anus, and also a large malignant tumour 
on the top of the upper third of his tail. 
