20 
ers, although eating animal matter in a decayed state 
when convenient to them.” Again quoting from Prof. 
Lintner: “The ordinary laws of nature give us a prod- 
igality of insect life almost infinitely in excess of fish 
fecundity. A fish deposits her spawn but once during 
the year, but in the aphis or plant louse in one year there 
may be twenty generations. Latreille says that a female 
aphis produces about twenty-five young each day, and 
Reaumur proved by experiment that a single aphis might 
be the progenitor of nearly six billion descendants during 
her life. The crustaceans are also remarkably prolific, 
* * * the proposition to propagate crustaceans and 
insects for fishculture must be regarded as intimately 
connected with that of transplantation—perhaps as a 
corollary of it.” 
Mr. Thomas Andrews of Guildford, England, a noted 
pisciculturist whose reputation as a successful fish propa- 
gator is broader than his native land. in writing me of 
some large fish in one of his ponds, said that they were 
grown in ponds containing an extraordinary amount of 
natural food, which he made a point of cultivating. I 
asked him to tell me what this food consisted of and his 
manner of rearing it, and he writes as follows: 
‘WestcaTE House, GuILprorb, Eng., 
May 7, 1892. 
“T make a great point of natural food for my trout, and 
devote several boxes of 10 or 12ft. long, 6ft. wide and rft. 
deep to that purpose, besides numerous small ponds and 
side streams. In order to appreciate the value of the 
principal, and I consider the best, food for young trout, 
viz., Gammarus pulex, one must observe them at this 
‘season of the year, and they will be found in pairs. Ifa 
pair is captured; the male insect detaches itself from the 
female, and she will look large on the abdomen and of an 
orange color. If she is placed in the palm of the hand 
and slightly pressed with a camel’s hair pencil, the young 
will be squeezed from her. This is my food for young 
