106 Thirty-fifth Annual Meeting 
eign countries where it is especially desirable to ship living eggs 
only. 
It may be of interest to note that eggs which have turned 
white after death will assume the normal color of living eggs if 
allowed to remain in the salt solution for two or three hours. 
They resume the white appearance gradually when again placed 
in water. 
NOTES ON POND CULTURE. 
It is impossible in this article to go into detail as to the many 
experiments which have been made during the past year at the 
various stations, but definite data is being gathered as to the 
number of brood fish which can best be handled in a pond of 
given area and depth. 
Some interesting observations have been made by Superin- 
tendent Green of the Fish Lakes station in connection with the 
spawning habits of the yellow perch, which entered one of the 
large ponds from the river as fry last season. When the ponds 
were drawn off the fish were placed in a smaller pond and re- 
tained through the winter. On April 2, when the water tem- 
perature was 50 degrees it was noted that they were spawning. 
They invariably cast their eggs on the west side of the pond. 
Several pairs were transferred to another pond where the saime 
peculiarity was repeated. In order to further test the matter the 
following series of experiments were tried. On April 6, 12 pairs 
of perch were placed in a tank in which tufts of grasses had pre- 
viously been placed at each end. On April 7, 8, and 10 clusters 
of spawn were found at the west end only. On April 10 several 
pairs were placed in another tank and tufts of grass deposited 
at the east end only. In this experiment one cluster of spawn 
was discovered on April 11 on the west side. The conditions 
were not changed, however, for five days, during which time no 
eggs were cast. The grass was then transferred to the west end 
and the following morning, April 17, three clusters of eggs were 
found on the west side. Another interesting observation was 
that the eggs were invariably cast at about five o’clock in the 
morning. The night watchmen were instructed to make observa- 
tions every hour from four p. m. to eight a. m., and during the 
intervening time the observations were continued by other as- 
