92 



THE POPULAR SCIENCE MONTHLY. 



is called to "Notes on the Ainu." By J. Batchelor. Vol. x, 

 part ii. 



" The Japan Weekly Mail." Yokohama. This newspaper con- 

 tains many valuable articles on the ethnology of Japan in general, 

 and the Ainu in particular. 



" The Language, Mythology, and Geographical Nomenclature 

 of Japan. Viewed in the Light of Aino Studies, including a 

 Grammar of the Aino Language, by J. Batchelor." By Basil Hall 

 Chamberlain. Memoirs of the Literature College, Imperial Uni- 

 versity of Japan. No. 1. Tokyo, 1887. 



" Unbeaten Tracks in Japan." By Isabella L. Bird. London, 

 1882. Two vols. The second volume contains a graphic and pictu- 

 resque account of the author's sojourn among the Ainu. 



" The Stone Age in Japan." By John Milne. Paper published 

 in the "Journal of the Anthropological Society," May, 1881. 



" Der Baerencultus und die Baerenf este der Ainos, mit einigen 

 Bemerkungen ueber die Taenze derselben." By Dr. B. Scheube. 

 Paper published in the " Mittheilungen der deutschen Gesellschaf t 

 fiir Natur- und Volkerkunde Ostasiens." December, 1880. Treats 

 of Ainu bear-wishop and dancing. 



"Die Ainos." By Dr. B. Scheube. Paper published in the 

 " Mittheilungen der deutschen Gesellschaft fiir Natur- und Vol- 

 kerkunde Ostasiens." February, 1882. 



" Ethnologische Studien iiber die Aino auf der Insel Yesso." 

 By Heinrich von Siebold. Berlin, 1881. Illustrated. 



"Japan in Yezo." By T. W. Blakiston. Yokohama, 1883. 



" Reisen und Forschungen im Amurlande." By L. von Schrenck. 

 Vol. iii contains much valuable information about the Ainu, gath- 

 ered from many sources. 



THE PROLONGATION OF HUMAN LIFE. 



By clement MILTON HAMMOND, 



IN order that one may live to near the limit in years of human 

 life, must he inherit some peculiar qualities ? Must he con- 

 form his habits to some set rules ? Must he eat and drink certain 

 things and abstain from certain others ? Or, does it all depend 

 upon a series of indeterminable accidents ? 



There have been many theories, and perhaps a pageful of 

 facts, given to the world upon the subject during the past few 

 centuries, but no thorough, systematic study of these questions 

 has been made. All that we know about the things that seem to^ 

 govern the length of man's life is what we have learned from 

 limited observation and the small number of cases that have been 

 imperfectly recorded in history or in medical works. It occurred 



