of Edinburgh, Session 1879 - 80 . 371 
the same in breadth. This sore had all the characters of a sore 
produced by the fungus disease. 
The cage was visited at intervals, and the effects of the salt water 
upon the fish noted. The cage with the fish was towed out to sea 
for two hours on each of six occasions. 
In a short time, the sore upon the fish was observed to he healing. 
The fish remained in the cage till the 2d or 3d of October, when an 
accident occurred by the breaking of one of the chains which held 
the cage in position. This allowed the cage to swing to one side, 
and nearer to the shore, when upon the ebbing of the tide the 
cage was left dry, which occasioned the death of the fish. On 
discovery of the accident, the fish was sent to me for examination. 
I received it on 4th October, after it had been confined in the 
cage for fully four months. From the combined effects of imprison- 
ment, and want of food, it had become very much shrunken, was very 
lean, and had more the appearance of a compressed eel than the form 
of a salmon. The fish was very dark in colour, the scales were un- 
injured, and the mucus covering was evenly thin and transparent, 
and there was no fungus on any part of its body. All the viscera 
were healthy the sores upon the head were healed, and the skin 
grown over them. A slight sore on the under surface of the right 
lower jaw, which appeared to have been caused by friction on the 
bottom or sides of the cage, was in a raw condition, but had not the 
least appearance of an unhealed ulcer. Fully one-third of the lower 
border of the upper lip, at the middle of the snout, and the outer 
and upper margin of the gums at the same part, were not quite 
healed, and the roots of the teeth were exposed from the parts having 
been ulcerated. 
The pectoral and caudal fins had been diseased, and some of their 
rays broken ; both were now healed and covered with membrane, 
and the shortened rays had the appearance of growing again. I con- 
sider the result of the experiment to be so far satisfactory ; it shows 
that migratory Salmonidos affected with an ulcer produced by fun- 
gus disease, get rid of it in salt water, even when confined and without 
food for a long period, and I infer from those facts, that had the fish 
experimented upon been free in the ocean for an equal period of 
time, it would have recovered both health and condition. 
The removal of all dead fish from the rivers has been universally 
2 Y 
VOL. X. 
