42 
ing fish on snails, Dr. Molin says in his ‘ Rationellen 
Zucht der Suswasser Fische,’ p. 13, that Commander 
Desme had a pond containing 150 hectolitres on his farm 
at Puy Girard, in which he fed young salmon and trout 
on pounded snails, and by this method of feeding he in- 
creased their weight on an average by one pound per 
fish.” 
That forms of life inhabiting the water and being 
equally or more prolific than the flies or worms would be 
far preferable, needs no demonstration. 
However we may differ as to some features of the 
methods recounted in the papers in question, the funda- 
mental principles are essentially the same and deserve 
careful consideration, as numberless adaptations of them 
may be evolved. . 
A paper by Mr. A. N, Cheney, entitled “Stocking 
Trout-Waters With the May-Fly,” which appeared in 
Shooting and Fishing of March 31st, 1892, has still 
another and a very practical bearing on the subject in 
general, 
The propagation of natural food has been followed for 
a number of years by the writer in the cultivation of 
ornamental fishes with complete success, the possibilities. 
in the production of crustaceans being limited only by 
the space devoted to it. Further than that, if space was. 
lacking for the purpose no difflculty was ever experienced. 
in getting abundant supplies from nature. It is only a 
question of knowing how to go-about it. Stagnant 
waters everywhere, and especially those destitute of 
fishes, abound with certain kinds of them, but principally 
with Daphniaand Cyclops. Watercress beds and masses. 
of other aquatic plants are alive with other kinds of 
them, such as Asellus Vulgaris (Water-hog, water-asel) 
and Gammarus pulex (freshwater shrimp). Masses of 
dead leaves in the waters of springs or spring streams. 
harbor them in great numbers. But the conditions in 
nature that promote their development are not nearly so 
