128 MALIGNANT TUMOURS. 



to eat enough grass to sustain life, I gave him daily a dozen or more 

 raw eggs. Under this treatment, the nodules which were in the 

 free part of the tongue, and which had, in the first instance, mani- 

 fested their presence in the substance of that organ only by yellow 

 patches on its surface, gradually separated themselves from the 

 surrounding tissue, and came away in the form of hard, granular 

 nodules, which looked like jDieces of greyish white or yellowish 

 white coral, and which varied in size, as I have, already said, from 

 that of a pin's head to that of a broad bean. The separation of 

 these nodules took place without any apparent inflammatory action, 

 and consequently without the formation of a single drop of pus. 

 The nodules which were embedded in the wounded surfaces, also 

 became loosened, and readily came away by the touch of the finger 

 nail. After six weeks of this treatment, all the nodules had disap- 

 peared out of the tongue, which had regained, to a great extent, 

 its normal size, colour, consistency and action ; the exposed surfaces 

 had healed over ; the flow of saliva had ceased ; and the animal 

 wns able to eat his green meat and hay without the slightest at- 

 tempt at quidding; had greatly improved in condition; and was 

 in excellent health. In fact, I trained him for racing later on. For 

 the first six months he had more or less difficulty in eating oats 

 from the state of his tongue, the full use of which he subsequently 

 recovered. I attribute these good results to the action of the iodide 

 of potassium ; for when I discontinued this drug on two occasions 

 for three days, the symptoms of swelling and hardness of the 

 tongue, running of saliva from the mouth, and adherence of the 

 nodules to the surrounding tissues, began to increase in a marked 

 manner, until I recommenced giving this medicine, Avhen they 

 began to abate with equal quickness. The fact of a young three- 

 year-old horse being able to tolerate such an enormous quantity 

 of iodide of potassium as this one took, is extremely interesting 

 to students of veterinary medicine. 



Instead of large doses of iodide of potassium, which is an expen- 

 sive drug, good results have been obtained by giving twice daily in 

 gruel about 5 grains of biniodide of mercury and 10 grains of iodide 

 of potassium in an ounce of water. The iodide of potassium is 

 added in order to render the biniodide of mercury soluble in water. 



Melanosis 



is a malignant new growth which occurs in various parts of the 

 body. It appears in the form of dark-coloured tumours which gra- 

 dually increase in size, and are usually situated on the lower, and 

 sometimes on the upper surface of the tail, and about the anus, 

 sheath and crest. When it affects the tail or crest, the hair over 

 the seat of the disease falls out after a time. Melanosis is, w^ith 



