574 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [22] 
and placed in a separate jar or jars, conveniently named “ hospital” or 
+‘ pest” jars; while later on only a daily treatment was needed, and dur- 
ing the last six weeks preceding the hatching season a weekly manip- 
ulation in this manner sufficed to keep the eggs in excellent shape. 
The “hospitals,” of course, were relieved of: their extraneous eggs when- 
ever a sufficient number had collected in bunches or layers to be drawn 
away unaccompanied with good ones. 
The wire gates were cleaned at least once a day throughout the season 
until the eggs began hatching, when they were removed to allow the 
fry and sheHs to float off, the supply of water for each jar being slightly 
decreased at this time to prevent eggs from being thrown overboard 
also. If the jars could be made exactly perfect, thereby compelling a 
uniform current of water to flow from all points of the base of the tube, 
the upward current might probably be so nicely adjusted as to throw 
off only fungoused eggs, in which event the gate and syphon could be 
dispensed with, thus making a complete self-picking apparatus; but 
the slightest imperfection in the jar or tube—found to exist in every one 
in use during the season—will create unequal currents, the stronger 
ones throwing good eggs against the gate, the weaker having strength 
barely sufficient to carry the light eggs to the surface but not enough to 
expel them; hence the necessity of a little assistance to complete the 
elimination, and which is undoubtedly accomplished more readily by the 
syphon than any other way. 
NOTES, ETC. 
One convenience, and probably the only one, of the hatching boxes 
over the jars is, that eggs in the former receiving a tri-weekly picking are 
nearly ready for shipment at all times, it being important of course in 
shipping eggs that all dead eggs should be removed; this the jar will 
not do; it separates only those made buoyant by confervoid growth, 
and the picking trough must be resorted to to complete the work ; hence 
a few trays and nippers and the picking trough will be found almost 
indispensable accessories, and should be retained in the hatching room 
where jars have displaced the boxes. : 
Although the collection of eggs of the whitefish is attended with 
hardships seldom if ever experienced in gathering eggs from any other 
kind of fish, yet from the date of their introduction into the hatchery 
they can be brought forward with much less trouble and expense (when 
the jar is used) than the eggs of any other member of the salmonoids ; 
and, furthermore, greater percentages can be hatched than from any 
other salmonoid, or from the shad. As compared with the latter, which 
are equally as well adapted to bulk methods of hatching, the difference 
in the temperature of water in which they are incubated must be charged 
with the difference in mortality, the rapidly growing fungous of the 
warmer water necessarily destroying a greater number of embryos. As 
compared with the former, over which they may have no advantage in 
