688 



SUBJECT INDEX 



Terrestrial Magnetism. fBclipse, solar, 

 of June 8, 191 8, results of magnetic 

 observations during. L. A. Bauer. 

 22. 



Vital Statistics. *Birth rate and death 

 rate, relation between, and rational 

 basis of empirical formula for mean 

 length of life. Alfred J. Lotka. 



53- 

 Volcanology. fExplosions, volcanic, 

 Note on. Robert B. Sosman. 296. 



fFumaroles, temperature inversions 

 in the, of Valley of Ten Thousand 

 Smokes, Alaska. Robert B. Sos- 

 man. 292. 



fKatmai and the Ten Thousand 

 Smokes. Robert F. Griggs. 347. 



*Volcano, representation of, on Italian 

 renaissance medal. Henry S. 

 Washington . 1 05 . 

 Zoogeography. Discontinuous distribu- 

 tion among the echinoderms. Aus- 

 tin H. Clark. 623. 



*Life zone investigations in Wyoming. 

 Merritt Carv. 533. 



Zoology. Arctic, recent zoological ex- 

 plorations in the western. Ru- 

 dolph Martin Anderson. 312, 



t356. 

 fCerion breeding, results in. Paul 



Bartsch. 657. 

 'fDallia pectoralis, Alaska's most re- 

 markable fish. E.W.Nelson. 178. 

 Holopus, the systematic position of 



the crinoid genus. Austin H. 



Clark. 136. 

 fMaximilian, Prince of Wied, on the 



Upper Missouri in 1833. Vernon 



Bailey. 419. 

 Philippine Island landshells of the 



genus Platyraphe. Paul Bartsch. 



649. 

 *Vertebrate zoology, the criterion of 



subspecific intergradation in. 



Harry C. Oberholser. 200. 

 jWood tortoise, exhibition of a young 



specimen of. R. W. Shufeldt. 



656. 

 fWood tortoise, occurrence of. Wm. 



Palmer. 656. 



