TWELFTH ANNUAL MEETING. 45 
to pass out of this second receiving jar out into the waste. The 
young fish, if they be whitefish or shad, as soon as they burst 
their shells, begin to swim around vigorously in the hatching 
jar, drifting with the current. They pass into the exit tube and 
are carried over into the receiver, in which they may be collected 
to any number desired, being retained there without injury until 
it is convenient to make a shipment. 
In extensive work in hatching I have found it more convenient 
to make use of large, glass aquaria for receivers, four or five 
hatching jars being disposed around one, which serves as a 
common collector for the young fish from all. A siphon, ar- 
ranged as shown in fig. 4, with a wire cage and strainer on the 
shorter end, serves to give free discharge to the water, while the 
strainer prevents any fish from passing out. I have found the 
hatching jars to be a very compact form of apparatus for hand- 
ling the eggs of the salmonidz. In this case it is not desired to 
nor do we give any motion to the eggs. The jar is filled with 
them from one-half to two-thirds full. The current of water 
being introduced at the bottom filters up through them, envelop- 
ing each egg ina stratum of fresh water, and placing each under 
the best possible conditions of development. From fifteen to 
eighteen thousand eggs may be readily placed in each jar. Of 
course, in the case of these eggs, we must have recourse to hand- 
picking. This is readily accomplished by opening the jars, 
placing the hand over the mouth to prevent the escape of water, 
inverting and placing the mouth under water over a broad shal- 
low tray. The eggs by gravity flow out and spread over the 
bottom of this, and when picked over are returned to the jar, the 
precaution being observed to have the jar full of water, and to 
use a broad flat funnel to return the eggs. They may be poured 
from the tray into the jar in bulk without any injury. 
From the experience had during the winter of 1882, in hatch- 
ing this class of eggs at Central Station, I am convinced that 
large numbers of eggs up to the very period of hatching can be 
handled in this jar 
The necessity of arriving at methods of hatching the light or 
floating eggs of many of our salt-water fishes has for several 
years impressed itself upon the United States Fish Commission 
