20 FISH-CULTURAL» ASSOCIATION. 
them out and found that the fungus had been killed so com- 
pletely that it could be stripped from off the eggs like a 
slough, leaving the eggs nearly, if not quite as clean as when 
first taken. From that time on until the eggs hatched out, 
which was, | believe, a period of about two weeks, he gave them 
a bath every day or every other day, and no more fungus ap- 
peared, and only about five per cent. of the whole number failed 
to hatch. Every experiment which he tried seemed to show the 
advantage of the salt bath in the destruction of the fungus, and 
that little or no harm resulted to the embryo fish. In order to 
‘test the effect of continued immersion upon the embryo, he 
placed some ova in the salt water and kept them there for forty- 
eight hours. At this time they were all in good condition, and 
it was not until they had been kept constantly immersed for 
from sixty to seventy hours that the embryos were unfavorably 
affected. 
Short immersions seem to have very little effect upon either 
the embryo or the adult fish, and, while there is a point beyond 
which we cannot safely go in our experiments with either the 
one or the other, yet of the two the embryo seems to be able to 
stand a longer immersion than the adult, especially than these 
species which are not anadromous. Short and moderately fre- 
quent immersions, then, will in all probability accomplish what 
is desired, so far as the destruction of the fungus is concerned. 
This, at least, seems to have been the case in my experiments, 
but it is much better, in every case where it is practicable to do 
so, to give this salt bath as soon as any fungus is discovered and 
before the hyphz have penetrated very deeply into the tissues, 
‘for it seems to be beyond question that the saprolegnia is one of 
these parasites that causes tissue destruction, as I have seen in 
numerous instances the gradual extension of the velvety car- 
peting of hyphz branches, from some minute wound on one 
side of the body of an animal, until the entire body was girdled. 
By taking the animal in hand early, and, in case there is no seri- 
ous wound to be aggravated by the salt, by using a strong solu- 
tion and using it for a short time and often, it seems to me that 
salt may be a valuable agent in the hands of those who wish to 
rid their aquaria or their hatcheries of what is often an intoler- 
