MELANOSIS. 259 
attentive to all coughs; accustom yourself to the sound of the healthy 
horse’s windpipe, that when the slightest change of noise indicates the 
smallest change of structure, you may be prepared to recognize and to 
meet the enemy before disease has had time to fix upon the membrane. 
Having laid down the above rules, it may, to the ignorant, appear 
that every possible movement of the proprietor has been interfered with; 
that, in fact, the horse owner has been left no freedom of action. To 
the informed, however, it will seem that nothing more than every gentle- 
man should observe has been proposed; and the horseman will smile 
when he learns that by such trivial matters can so heavy an affliction as 
broken wind be avoided. 
MELANOSIS. 
A quantity of black deposit, accumulated in large quantities upon 
certain parts of the frame, and contained within an 
increased amount of cellular tissue, constitutes this “ae 
disease. At an early period swellings may be 
detected externally; they may be as small as a 
millet-seed, or as large round as a plate. These 
may remain dormant for years, or, if cut into before 
they start into activity, are almost white, and very 
glistening in parts, much resembling cartilage. So cee a anata 
As time progresses, however, all the white disap- MIDPLE stace oF prvezor- 
pears, and its place is filled by a material not unlike 
lamp-black when thoroughly incorporated with water. These growths 
increase both in number and in size. Should one be cut into after it is 
THE SPLEEN OF A HORSE LOADED WITH MELANOTIC TUMORS. THE BLACK SPOT TOWARD THE RIGHT HAND REPRE- 
SENTS ONE OF THE GROWTHS DIVIDED. 
fully matured, an inky fluid follows the knife. The disease is not con- 
fined simply to external tumors; the coverings to nerves, the coats of 
arteries, and the recesses of the closest bones, are each found to bear 
minute evidences of a melanotic tendency. The deposit, however, seems 
principally to attack the internal organs. The interior of the sheath is 
not unfrequently clogged to that degree which forbids the passage of the 
