68 Thirty-fourth Annual Meeting. 
of hogs’ plucks is now largely overcome, and the cost of feeding 
at stations where this material has been substituted for beef 
plucks has been greatly reduced. 
At stations where fresh food is not always available there 
is a demand for preserved foods. It is evident that fish need 
nitrogenous foods. The question arises how much waste there 
may be in the use of cereals, and to what extent it can be avoided. 
In connection with the experiments on this subject it may be 
necessary to examine the feces of the fish, and if the waste is 
quite large the fact can be disclosed by the use of a low-power 
glass. ‘The extensive use of wheat middlings suggests the sub- 
stitution of other less expensive grains, or vegetables. A begin- 
ning has been made by experiments in the use of cotton seed 
meal; meal from the germ of corn; beans; lentils; macaroni. 
If any combination of vegetables or cereals with meat can be 
found which seems to agree with the fish an analysis will be made 
to ascertain just what elements are most satisfactory. An analy- 
sis of the mixtures which do not agree with the fish will also be 
made in order to ascertain just what elements should be elimin- 
ated. It is proposed to analyze preparations which have been 
cooked, as well as those fed without cooking, whether composed 
of the same ingredients or not. Dr. H. W. Wiley of the depart- 
ment of Agriculture has already materially assisted the Bureau 
in this direction. 
Mention of these experiments is here made because it may 
suggest new ideas to the fish culturists of this Socitey which will 
lead to successful experimental work. The field seems to be a 
very broad one. ° 
In connection with food experiments it is desirable to be 
able to answer certain questions rather definitely, although local 
conditions have much to do with the subject. For illustration, 
it should be possible to state the cost of feeding a given number 
of fish of a certain species and age during a stated period. The 
growth should also be noted by weight. It is realized that this 
necessitates a long and careful series of experiments by the iso- 
lation of certain lots of fish at a number of stations. 
The report of Superintendent Atkins contains some inter- 
esting data, and it is as follows: 
“With the exception of a single cow-careass, all the food 
