56 ANIMAL ECOLOGY 



KEYES, C. R. 



1898. The Genetic Classification of Geological Phenomena. 



Jour. GeoL, Vol. VI, pp. 809-815. 

 Valuable for its discussion of the criteria used in genetic 



studies. 

 VAN HISE, C. R. 



1904. The Problems of Geology. Jour. GeoL, Vol. XII, pp. 

 589-616 ; Inter. Cong. Arts and Sciences, St. Louis, 

 Vol. IV, pp. 525-548. 1906. 



An excellent discussion of the energy, agent, and process 

 method of investigation. I have seen no similar dis- 

 cussion applied to biological or zoological subjects. 

 BOAS, F. 



1896. The Limitations of the Comparative Method of An- 

 thropology. Science, N. S., Vol. IV, pp. 901-908. 

 A suggestive paper for the student of ecology who uses 



the comparative method in his own work. 

 1904. The History of Anthropology. Science, N. S., Vol. XX, 



pp. 513-524. 

 Application of the genetic and historical method to 



the study of man. 

 MILL, J. S. 



1881. A System of Logic, Ratiocinative and Inductive : 

 Being a Connected View of the Principles of Evi- 

 dence and the Methods of Scientific Investigation. 

 Eighth Edition, pp. 659. New York. 



PEARSON, K. 



1900. The Grammar of Science. Second Edition, pp. 548. 

 London. 



JEVONS, S. 



1879. Principles of Science. Third Edition, pp. 786. 



London. 



Certain chapters are of special interest. 

 CRAMER, F. 



1896. The Method of Darwin. A Study in Scientific Method, 

 pp. 232. Chicago. 



