SCIENCE 



A WEEKLY JOURNAL DEVOTED TO THE ADVANCEMENT OF SCIENCE, PUBLISHING THE 



OFFICIAL NOTICES AND PROCEEDINGS OF THE AMERICAN ASSOCIATION 



FOR THE ADVANCEMENT OF SCIENCE 



Editobial Committee : S. Newcomb, Mathematioe ; R. S. Woodward, Meohanios ; E. C. Pickkbinq 



Astronomy ; T. C. Mkndenhall, Physics ; Ira Rbmsen, Chemistry ; Chables D. Walcott, 



Geology ; W. M. Davis, Physiography ; Hknby F. Osbobn, Paleontology ; W. K. 



Bbooks, C. Haet Mebbiam, Zoology ; S. H. Scuddeb, Entomology ; C. E. 



Bessey, N. L. Bbitton, Botany ; C. S. Minot, Embryology, Histology ; 



H. P. BowDiTCH, Physiology ; William H. Welch, 



Pathology ; J. McEeen Cattbll, Fsyohology. 



Friday, December 11, 1903. 



C0XTENT8: 



University Registration Statistics: Db. 

 Rudolf Tombo, Jr 737 



Variations induced in Larval, Pupal and Ini- 

 aginal States of Bombyx mori by Controlled, 

 Varying Food Supply: Professor V. L. 

 Kellogg and R. G. Bell 741 



Scientific Books: — 



Recent Psychological Literature: Pro- 

 fessor James Rowland Angell 748 



Scientific Journals and Articles 751 



Societies and Academics: — 



The Convocation Week Meetings of Scien- 

 tific Societies. The Academy of Science of 

 St. Louis: Professor William Trelease. 

 New York Section of the Atnerican Citemical 

 Society: Dr. H. C. Sherman. Torrey 

 Botanical Club: Dk. F. S. Earle. Tlie 

 Science Club of the University of Wiscon- 

 sin: Victor Lenheb 751 



Discussion and Correspondence : — 



The Chemistry of Soils as related to Crop 

 Production: Professor E. W. Hiloard. 

 Absorbed Gases and Vulcanism: Alfred C. 

 LApre 755 



Shorter Articles: — 



The Heredity of 'Angora' Coat in Mam- 

 mals: Professor W. E. Castle. Concern- 

 ing Mosquito Migrations: Professor John 

 B. Smith "tiO 



The Congress of Arts and Science of the St. 

 Louis Exposition 764 



The American Society of Naturalists 766 



Scientific Notes and News 766 



University and Educational News 768 



MSS. intended for pahllcation and books, etc.. Intended 

 for review abould be sent to tbe responsible editor, Pro- 

 lessor J. McKesn Cattell, Qarriaon-on-Hudson, N. .'. 



UNIVERSITY REGISTRATION STATISTICS. 



A COMPARISON of the figures on the table 

 Avith those for 1902 (Science, N. S., Vol. 

 XVI., No. 417, December 26, 1902, p. 1022) 

 will show that at the majority of the insti- 

 tutions given in the table the number of 

 students enrolled during the present aca- 

 demic year represents an increase over the 

 registration of last year. Several institu- 

 tions have suffered a slight decrease in 

 attendance and the general gain is not as 

 marked as it was last year, yet on the whole 

 the figures point to a normal and healthy 

 growth, and the steady forward movement 

 in the progress of higher education has con- 

 tinued virtually unchecked. Undoubtedly 

 the present economic conditions of the 

 country are partially accountable for this 

 slight falling off in the percentage of gen- 

 eral increase, but the effect, if any, can 

 scarcely be regarded as serious, and would, 

 in the ordinary course of events, not be felt 

 keenly until next year. 



The statistics given on page 738 are, 

 with few exceptions, approximately as of 

 November 1, 1903, and relate to the regis- 

 tration at twenty of the leading univer- 

 sities throughout tlie country. In order 

 to avoid all misapprehension, it should be 

 distinctly understood that the higher insti- 

 tutions of learning here represented are 

 not necessarily the twenty largest or the 

 twenty leading universities, but all are in- 



