Sept. 17. I9I7 Proteins of Certain Insects 637 



June bugs, while containing a slightly greater amount of protein than 

 the grasshopper, and of equal value, could not be made an economical 

 source of protein because of their limited number and the short time in 

 which they are available. 



From the data herein contained we may draw the following con- 

 clusions : 



(i) That the instinct in wild and domesticated birds which guides 

 them in their natural selection of the most efficient food is confirmed by 

 the high lysin content found in the insects thus far examined. 



(2) That grasshoppers deprived of their moisture contain a higher 

 protein content than commercial meat meal, and in all probability 

 could be made an efficient substitute therefor. 



LITERATURE CITED 

 (i) Beal, F. E. L. 



1915. SOME COMMON BIRDS USEFUL TO THE FARMER. U. S. Dcpt. Agf. Farmer's 

 Bui. 630, 27 p., 23 fig. 



(2) LuSK, Graham. 



1906. THE ELEMENTS OP THE SCIENCE OP NUTRITION. 326 p., II fig. Phila- 

 delphia and London. 



(3) Osborne, T. B., and Mendel, L. B. 



1914. amino-acids in nutrition and growth. In Jour. Biol. Chem., v. 17, 



no. 3, p. 325-349. 

 (4) • 



1915. THE COMPARATIVE NUTRITIVE VALUE OP CERTAIN PROTEINS IN GROWTH 



AND THE PROBLEM OF THE PROTEIN MINIMUM. In Jour. Biol. Chem., 

 V. 20, no. 3, p. 351-390- 

 (5) • 



1916. THE AMINO-ACID MINIMUM FOR MAINTENANCE AND GROWTH, AS EXEMPLI- 



FIED BY FURTHER EXPERIMENTS WITH LYSINE AND TRYPTOPHANE. Itl 



Jour. Biol. Chem., v. 25, no. i, p. 1-12. 



(6) U. S. Entomological Commission. 



1880. second report ... for the years 1878 and 1879, RELATING TO THE 



rocky mountain locust and the western cricket ... 322+80 p., 

 17 pi., 7 maps. Washington, D. C. 



(7) Walton, W. R. 



1916. grasshopper control in relation to cereal and forage crops. 

 U. S. Dept. Agr. Farmer's Bui. 747, 18 p., 21 fig. 



(8) Whiting, J. D. 



1915. Jerusalem's locust plague. In Nat. Geog. Mag., v. 28, no. 6, p. 511- 



550, illus. 

 4600°— 17 4 



