274 
DISEASED LUNGS OF A HORSE. 
tumours, those seen on the surface of the organ varied in 
colour. The summits of all the larger ones were of a light 
gray, their sides of a brownish aspect, and their bases the 
same in colour as the spaces between them, which was the 
natural colour of the healthy spleen. The surfaces of this 
organ, studded as they were with these tumours, might be 
made to resemble a miniature model of a section of the 
earth on which a number of snow-capped mountains existed, 
varying in height, the bases of which, and the valleys be¬ 
tween them, being of a brownish-purple colour, as though 
covered with heather. These tumours, when cut through, 
presented the same structural appearance as those previously 
mentioned as existing in the lungs, but in consistence they 
were evidently firmer. The heart was smaller than natural, 
pale, and flabby to the touch. At its apex it had evidently 
undergone a fatty degeneration, very little* muscular tissue 
being present at this part of the organ. 
Such is the general character of the above-named organs 
as seen by the unaided eye, and to those conversant with 
pathological anatomy it is sufficient to give a tolerable idea of 
the true nature of the disease. But it is to the microscope 
that we are indebted for a more precise knowledge of the 
character of such deposits. By its aid only can we determine 
the nature of the histological elements of which growths like 
these are made up. 
On examining a small quantity of matter scraped from the 
cut surface of the diseased parts of either of these organs, 
similar elements were seen (by me at least, others who examined 
them may have discovered more), of the same character as 
those noticed in Mr. South’s case, viz., large nucleated cells, 
granular cells in large numbers, free nuclei, with an in¬ 
tensely granular fluid. A little matter taken from the cut 
surface of the tumours of the spleen had, I thought, many 
more of the large nucleated cells in it than I observed in 
that taken from the other organs. 
I have thus given a brief sketch of the diseased organs 
taken from the horse under the care of Mr. Clark, to whom 
I feel indebted for the opportunity he has given me for such 
an interesting investigation. By what title is this disease to 
be designated? It has been suggested to me that it is 
cancer, and I think that the nature of the growths (ab¬ 
normal) before referred to justifies such an appellation. This 
disease did not, in all probability, commence in either the 
lungs or spleen, but in some other organ, most likely in the 
bronchial glands. This may have been the case also in Mr. 
South’s case, and from these organs some of the abnormal 
