500 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [10] 
water of the vessels to a depth of one or several centimeters, according 
to the different kinds of fish. These frames have raised edges which 
rest on the sides of the apparatus. Their dimensions are as follows: 
Length, 1 meter; breadth, 0.10 to 0.20 centimeters; depth, 0.05 to 0.10 
centimeters. 
Fig. 8 represents the incubating apparatus and Fig. 9 the hair frame. 
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This apparatus may be considerably enlarged by adding more vessels, or 
by placing them one below the other in the shape of steps, as indicated 
in Fig. 10. 
At one end or in the bottom there is an opening for a tube to let out 
the water, with a stop-cock, so that the water can be let out at any 
time. 
For the incubation of trout eggs M. Coste uses an equally excellent 
apparatus, which is shown in Fig. 11, and therefore needs no further 
