398 T'isoine In AMERICAN WATERS. 
cated by the upper half of the screen; the lower, or left 
half, merely represents the perforated bottom of zine. 
Screen D, for catching the fecundated eggs, is the same 
width and length as C, divided into trays also for remov- 
ing their contents conveniently. 
The engraving represents the race from the supply pond half 
way te the outlet of the race into the creek or lower pond. 
Screen © is open at each end, so that trout from the creek 
below or the pond above may enter freely, it being an ar- 
tificial imitation of a natural spawning-bed. The follow- 
ing is the inventor’s déscription : 
“This race may be built like the races made for the artificial 
impregnation of spawn used by nearly all trout-breeders to en- 
tice the trout up from the pond to spawn. It can be made 
of any length from 10 to 50 feet, and from 2 to 6 feet wide, 
according to the number of trout which are to use it, and the 
amount of water for the supply of the pond. It should be 
made with plank sides and bottom, so tight as to keep out all 
sediment. Paving the bottom nicely with small stones will 
answer. The bottom, whether of plank or stone, must then 
be covered with a halfinch layer of fine, well-washed gravel. 
“When one has large trout to spawn in the race the water 
should be 2 inches deep at the upper or supply end, and 15 
inches deep at the lower end where it empties into the pond, 
with a gentle current throughout its whole length. This will 
give good spawning depth to the water for trout of all sizes 
from 6 to 24 inches long. Usually a race 3 feet wide, and 
from 15 to 20 feet long, will be quite sufficient for a pond of 
1000 or 1800 trout. 
“The bottom of this race must be covered with fine wire- 
cloth screens, of about 10 meshes to the inch, made of zinc 
or galvanized wire, so as not to corrode, and thus injure the 
spawn. Tron wire, 77 painted, will answer where zinc can not 
be obtained. These wire screens must be nailed to wooden 
frames, made of inch-square stuff, the frames to correspond in 
length with the width of the race, and to be as wide as the 
