20 
fish for stocking purposes, and the results are more sat- 
isfactory by far. We cannot get anything like enough 
yearlings or two-year olds to supply the demand, and 
most people over here have given up stocking with fry. 
There is of course a sale for fry in England, as proper 
rearing ponds have in many cases been made, but the 
general opinion is in favor of yearlings.” 
Mr. Andrews'’s letter shows the way to vast possibilities, 
not only in the line of rearing trout fry in ponds on nat- 
ural food, but in supplying mature fish in wild waters 
with a generous addition to their larder by transplanting 
eggs, larvee or imagos of various insects. It is a most 
fascinating subject, but the pages already written warn 
me that I must be brief. The alder-fly and grannom-fly, 
referred to by Mr. Andrews, belong to the dun tribe, the 
former being the alder, orl or light dun, and the latter 
the green-tail or shell-fly of the fly-fisherman. The duns 
belong to the family PAryganzde and are called caddis- 
flies, and the larve are called caddis-worms, and are 
sometimes confused with the May-fly, which they should 
not be. The dun or caddis-flies are so common, that a 
description of any one of the score or more species is un- 
necessary. The larvee or creeper cases are hollow cylin- 
ders, smooth inside, composed of straw, grass roots, 
small stones and shells, and closed atoneend. They are 
excellent trout food; every trout fisherman is familiar 
with them, and they are easily collected for transplant- 
ing. D. Barfuth, of the University of Bonn (Report U. S. 
Fish Commission 1873 and’74 and 1874 and’75, p. 735), 
examined a number of the common trout of Europe 
(farzo) and found these to contain the creeper cases of 
Phryganide as follows: In one, 136 cases; in another, 
585; 1n another, 116; in another, 186, and in another, 115. 
Of six trout examined, the cases were found in all the 
stomachs, and also in the entrails; in one, the intestinal 
canal, as far as the anus, was completely stuffed with the 
cases, 
