BULLETIN OF THE UNITED STATES FISH COMMISSION. 451 



the different iugredients one should see to it that there is not too great 

 a difference between their i)ractical value and their price. It ^^ ill be 

 found to be exceedingly injudicious to use corn for this purpose. For 

 corn, oats, or rye may be at any time substituted to advantage; for, ac- 

 cording to Dietrich and Konig, tliere are, on an average, contained : 



Proteine. 



Fat. 



Hydrate 

 of carbou. 



In corn . . 

 In rye... 

 In barley 

 In oats... 



Per cent. 



8.09 



13.31 



12. 09 



12.66 



Per cent. 



3. 5 to 4.05 

 1. 9C 

 2.09 

 6.09 



Per cent. 

 65.43 

 65.16 

 64.97 

 54.30 



Corn costs at present about 6 J marks ($1.54) per 100 pounds, while 

 the other three cereals may be bought for from 4 marks 30 pfennigs 

 ($1.02) to 5 marks ($1.19). 



Instead of linseed or rapeseed, sesame cake may be used to advantage, 

 which costs only 5 marks ($1.19) per 100 pounds, and contains 33 per 

 cent, albumen, 13 per cent, fat, and 24 per cent, substances free from 

 nitrogen. A pound of fat or a pound of albumen would therefore cost 

 only 10 pfennigs (2.3 cents), and a i>ound of hydrates of can on only 2 

 pfennigs. In order to make the mixture more binding it will be found 

 advantageous to add a few kilograms of linseed cake per 100 pounds. 



Peas may be entirely omitted, or the cheaper vetches may be substi- 

 tuted for them. A portion of the ground meal n)ight also be omitted, 

 or be replaced to advantage by cockchafers. Dried cockchafers can 

 easily be ])rocured for 9^ marks ($2.26) per 100 j)ounds, while ground 

 meal costs 15 or 16 marks ($3.57 to $3.80) per 100 jjounds. The composi- 

 tion of both these articles is very similar. 



According to Dittman, dried cockchafers contain — 



Per cent. 



Proleiue 66.5 



Chitiue 4.52 



Fat 16.06 



Particles of ashes 4. 52 



while ground meal contains, according to Dietrich — 



Per cent. 



Water 8.86 



Proteine 75. 06 



Fat 12.30 



Ashes and sand , 2. 30 



According to Pott — 



Per cent. 



Water 10 48 



Proteine 72. 46 



Fat 12.42 



Ashes and sand 4, 88 



