106 Scientific Intelligence. 
furnished with charcoal and gravel is near by and turns into the box, 
drop by drop, filtered water, furnishing about 2 or 3 litres of water per 
h ; 
our. The water is thus always in motion, and it is only necessary to 
fill the reservoir each morning to keep the apparatus in action without ) 
supervision. 
The total expense of the establishment is but 6 franes. With 35 
litres of water for six weeks, M. Millet has bred about 25000 trout of 
salmon, and he expects to breed some millions of different species in 
the course of the year. 
In order to obtain the. eggs from the female, M. Millet employs nearly 
the process used by Rémy and Géhin. He makes the eggs to pass out 
only as they are mature, leaving an interval of two days between each 
operation, this consisting in passing the finger lightly over the surface of 
the abdomen of the female. Another process consists in enclosing the 
emale in a cage with a double bottom, formed of bars rather far apart; 
the females drop their eggs by organic contraction, and aid themselves 
in it by rubbing against the bars. The eggs fall upon the frame. e 
males are then introduced, and often they fecundate at once the eggs; 
being incited to it by the presence of the female and the odor of the 
eggs; but if not so, it is provoked by slight friction as in the ejection of 
the eggs from the female. 
fi 
The process of M. Millet has been put in practice in several places 
near Paris, and repeopling the rivers has been already begun. Con- 
be n ry to return to the process of Rémy, sists in ‘* sow- 
ing” herbivorous fishes in the streams populated by the trouts. M. Mil- 
let is still engaged in his labors, and ll avor to keep our 
On the destruction of insects by §aséous injections.—On the same oc- 
casion with the reading of the preceding memoir, another relating to ap- 
