No. 614] PHYSIOLOGICAL PROBLEMS 



L51 



The animal geographer is interested in the same prob- 

 lems. We note that the animal community illustrated by 

 the spiders contained animals maturing at every season 

 of the year. There is a noticeable early spring or vernal 

 group which the geographer has assumed is montane in 

 origin (Adams, '09) ; and the group of land species which 

 appears through the summer is traced into different sit- 

 uations according to specific affinities. It is evident that 

 successful species are those that fit into the seasonal 

 rhythm with respect to physical conditions, food, and nu- 

 merous other relations. 



b papers as were actually used are cited, 

 ee, W. C. 



1911. Seasonal Succession in Old Forest Ponds. Trans. III. State 



Acad. Sci., 4: 126-131. 

 1909. Die Bestimmung des Alters pelagisch lebender Fischeier. Mitt. 



d. Deutschen Seefischerei-Vereins, 25 : 364-73. 

 1911. Die Verbreitung der pelagischen Fisheier und larven in der 



Meeresunters., N. F., Eel, 13: 227-280. 



Bachmetjew, P. 



1907. Experimentelle Entomologische Studien, Bd. II. Soph 

 Banks, Nathan. 



1910. Catalogue of Nearctic Spiders, U. S. N. M. Bull. 72. 

 Baumberger, J. P. 



1917. Studies in the Longevity of Inseets. Ann. Ent. Soc. 

 323-54. (Good bibliography.) 



Berger, B. 



1907. Ueber die Widerstandigsfahigkeit der Tenebrio Larve 

 Austrocknung. Arch. f. d. Gesammte Phys. (Pfluger's 

 118: 607-612. 



1890. Untersuchungen ueber die Bryozoen des Wassers Susse 

 Zool., Bd. II, Heft 6, 83 ff. 



Candolle, A. 



1855. Geographic Botanique, Eaisonee. Paris (Cites 1830 pi 



