375 
of Edinburgh, Session 1879 - 80 . 
that found upon diseased salmon from the Tweed and Solway rivers 
during the epidemics of 1878 and 1879. I observed that the 
majority of the filaments of the fungus found upon the Ightham 
fish were spear-shaped, very few had clavate fruit heads, and I saw 
none with ripe zoospores, indicating that the reproductive power of 
the fungus was feeble, and was producing only barren filaments, 
which appears to be always the case when the epidemic has run its 
course. 
Only four of the ten specimens had any external blemish upon 
them, which consisted of slight ulceration upon one pectoral fin in 
two, and in the caudal fins of other two ; several of the rays were 
broken, and portions of them were hanging by the filaments of the 
fungus. In all the specimens the fungus covered the greater part of 
their bodies ; and the heads of several, including the eyes and 
nostrils, were completely covered over. In none of the fish were 
the gills affected, but five of them had the opercular opening of the 
gills nearly closed up by the fungus. 
On opening the abdomen the viscera were seen to be white, firm 
in position, and with a fair amount of fat upon the stomach and 
intestines. The roe in the females was firm and clear, and though 
very small, it was more advanced then the milt in the males. The 
heart, liver, and spleen were normal in size, and not the least 
appearance of extravasation in any of the organs. On opening the 
stomach and intestines I could not determine what the food of the 
fish had been, as only white glairy mucus in small quantity was 
found in any of them. 
The blood was perfectly normal in all, and the subcutaneous tissue 
was in no instance discoloured, even under the thickest patches of 
fungus, showing that up to the time the fish were captured no ulcera- 
tion, or indication of any, either on the head or scaled parts of the 
body, had taken place. The seven specimens preserved and sub- 
mitted to the Society will be found to be without a sore or an ulcer 
on any part of them, which S. ferax could claim as a pre-existing 
nidus upon which to plant itself. I may notice here that there seems 
to be two ways by which the fungus causes death by suffocation. 
The first and quickest way is when the fungus gets seated within the 
mouth and upon the gills at the same time, which I have observed 
occurs oftener in the large fish than in the small. The second, and 
