238 
Proceedings of the Royal Society 
has, so far as I know, not been supported by scientific evidence, 
and rests mainly on the recollections of old anglers and fisher- 
men. 
I shall now proceed to relate observations on the disease as it 
has shown itself upon the salmon and other fish of the river 
Tweed. 
On 12th April 1879, I received from G. H. List, Esq., chief- 
constable of Haddington and Berwickshire, three salmon, which 
were taken alive from the Tweed on lltli April. They were cap- 
tured at Cornhill boat fishery, near Coldstream. All the fish were 
extensively affected with fungus on all parts of their bodies and 
fins. 
The fungus is identical with that found upon the salmon and 
other fish of the Solway rivers described by me in 1878. 
Ho. 1, a female salmon. — This fish was in the act of spawning 
when captured ; complete dehiscence of the ovaries had taken place, 
and the greater part of the ova were shed, about six ounces, by 
measure, being retained in the cavity of the abdomen. The ger- 
minal membranes of the ovaries were plentifully supplied with 
germs for the following season. 
The condition of this fish as a spawning baggit was very good ; 
the skin, where not covered with fungus, was clear and silvery ; 
the gills were high coloured and free from parasites of any kind; all 
the viscera were healthy, and a fair amount of fat adhered to the 
stomach and pyloric caeca. Blood taken from the heart, liver, 
spleen, and kidneys was carefully examined under the microscope, 
and was found to be perfectly normal. The lower part of the intes- 
tine was filled with a semi-transparent mucus of a pale rose colour, 
in which bacteria were very numerous. Two tape- worms of large 
size filled a considerable portion of the intestine with their plicated 
folds. 
This salmon had over a dozen large patches of fungus adhering to 
it ; one of them was 4 inches long by 3 inches broad, and was felted 
to one-fourth of an inch in thickness in the centre, forming a 
limpet-like crust of a slatey-grey colour. On careful removal of 
those patches of fungus, in most instances only a discoloured mark 
corresponding to the patch was seen adhering to the outer surface of 
the scales, which were in their normal position; but in several of 
