THIRTEENTH ANNUAL MEETING. T5 
was normal. The embryological investigations were carried on 
by Professor Ryder, who perhaps will add a few words. 
Prof. RypEr: You do not mean to say that all the eggs taken 
were fertile, but that the greater portion of them were. There 
were large quantities that I know would come to nothing. The 
vitellus had turned to a brownish hue, and the germinal disc 
was disorganized. 
SALT ASAN. AGENTS. FOR THE DESTRUCTION OF 
THE FISH FUNGUS. 
BY PROF. H. J. RICE. 
There are very few persons who have ever had anything to do 
with the artificial rearing of fish; especially if the rearing is 
carried on in comparatively quiet and warm water; or who 
have ever had very much to do with fish in aquaria, but have 
been more or less exercised over the decorations and ravages 
of that very insidious and annoying vegetable parasite, com- 
monly known as fish fungus, although it occurs, indeed, on 
many other objects than eggs and fishes. Many means have 
been employed for its destruction, and innumerable efforts made 
to dislodge it from the tanks where it had obtained a firm foot- 
hold. Asphalt, tar, salycilic acid, salt and various other simple 
or compound agents of destruction have been employed, and 
while each and all of them have been pronounced beneficial, yet 
most of them are difficult to apply, and after being applied much 
care is necessary in order that the agent shall not be the means 
of doing that which they were employed to prevent; that is, 
cause the death of the eggs or fish experimented with. Of all 
the agents thus far employed for the purpose of destroying this 
fungus, or saprolegnia, common salt is, taking everything into 
consideration, probably the most useful, since it can always be 
easily obtained and quickly manipulated. But it is always well 
to bear in mind that with whatever agent the work is carried on, 
