362 Fisninc iv Amertcan WAtTERs. 
Tocqueville had determined that a strong light was injuri- 
ous, and that a lamp or candle should not be thrust before 
young fishes. This was one of the reasons for placing the 
government breeding apparatus at Huningue under cover; 
another was to maintain in the hatching-troughs nearly an 
even temperature throughout the winter while hatching 
game fishes of the genus Salmo, that spawn late in autumn ; 
tor these, while young, are much more delicate than common 
fishes, which (spawning in spring) hatch in a few days, and 
require comparatively no care in the process or in the kinds 
of feed; for, as they come into the world without a sac of pro- 
vision to last them a month suspended to the umbilical cord, 
nature prepares them for fighting their way for food from the 
moment when they leave the shell. 
Géhin had visited Paris in 1850, and was presented to Lou- 
is Napoleon, then president of the republic, as quite a person- 
age, and received from the government, in compliance with 
the promise of M. Milne Edwards, the mission to stock the 
rivers of several departments. 
There were 50,000 brook and lake trout introduced to the 
waters of the Bots de Boulogne in 1856, where they grew 
rapidly. At this time many of the public waters through- 
out France, which had rested dormant, began to astonish 
and delight the neighborhoods with the leaps above water 
of amber beauties, which formed miniature rainbows in the 
gleams of the sun, and many peasants regarded this novel 
gift of life and beauty as a providential blessing on Napo- 
leon’s reign. 
Reports of successes in pisciculture poured in monthly more 
nunmerously from every department. The waters were ev- 
ery where stocked with young fishes, which were doing well. 
The ponds, lakes, and reservoirs in public parks were each 
annually hatching 25,000 to 50,000 of the genus Salmo for 
the benefit of the public rivers of France. 
In the departments generally, the zeal of the préfets kept 
pace with that of the government, and men of science and 
