FISHES. 337 
It is known that when the salmon ascend the streams from the 
sea, they do so in order to deposit their eggs in the fresh water. 
The female fish by means of her nose and tail, hollows out a 
furrow, throwing up the gravel in such a position, that the force 
of the stream is broken and cannot carry away the roe which 
she deposits. By adopting this plan, she secures for her eggs a 
constant change of fresh water, which is absolutely essential for 
THE EXTERIOR RESERVOIRS, HUNINGUE. 
their development. Guided by unerring instinct, the male fish 
discovers the deposit of eggs, and covers them with “soft spawn,” 
or “milt;” this matter disseminates itself ina milky cloud through 
the water and coming in contact with the eggs, imparts to them the 
power of development, and immediately the process of life com- 
mences its wonderful course. 
The clever naturalist Jacobi, conceived the idea of placing the 
eggs thus impregnated in an artificial stream of water, so that the 
process of their hatching could be closely watched, and the 
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