REFERENCES TO SCIENTIFIC TECHNIQUE 63 



mining normal food habits. The method is strongly 

 condemned. Valuable series of references. 

 NEUMAYER, G. VON. 



1906. Anleitung zu Wissenschaftlichen Beobachtungen auf 

 Reisen. Dritte Auflage, Bd. 1, pp. 842; Bd. 2, 

 pp. 880. Hanover. 



A very important work, particularly for the traveling 

 naturalist. Chapters by specialists, valuable ref- 

 erences on collecting natural history specimens, and 

 other phases of scientific exploration. 



PEARL, R. 



1911. Biometric Ideas and Methods in Biology; their Sig- 

 nificance and Limitations. Scientia, Vol. X, pp. 

 101-119. 



PETERSEN, C. G. JOH., and JENSEN, P. B. 



1911. Valuation of the Sea. 1. Animal Life of the Sea- 

 Bottom, its Food and Quantity. Rep. of the Danish 

 Biol. Sta. to the Board of Agriculture, Vol. XX. 

 pp. 76. Translated from Fiskeri-Beretning for 

 1910. Copenhagen. 



Methods and results of a quantitative study of animals 

 on the sea-bottom. A very important paper. De- 

 scriptions and figures of the apparatus used. 



REIGHARD, J. 



1908. Methods of Studying the Habits of Fishes, with an 

 Account of the Breeding Habits of the Horned 

 Dace. U. S. Bur. of Fisheries Bull., Vol. XXVIII, 

 pp. 1111-1136. 



1908. The Photography of Aquatic Animals in their Natural 



Environment. Bull. U. S. Bur. of Fisheries, Vol. 

 XXVIII, pp. 41-68. 



These papers also contain references to others on the 

 habits of fishes. 



KING, L. A. L., and RUSSELL, E. S. 



1909. A Method for the Study of the Animal Ecology of the 



