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. 
EDITORIAL COMMITTEE: S. NEWcomB, Mathematics; R. S. WoopDwaRpD, Mechanics; E. C. PICKERING, 
Astronomy ; T. C. MENDENHALL, Physics ; R. H. THURSTON, Engineering ; IRA REMSEN, Chemistry ; 
JOSEPH LE CONTE, Geology ; W. M. Davis, Physiography ; HENRY F. OsBoRN, Paleontology ; 
W. K. Brooxs, C. HART MERRIAM, Zoology ; S. H. ScuppER, Entomology ; C. E. BESSEY, 
N. IL. Brirron, Botany; C. S. Minot, Embryology, Histology; H. P. Bowpitcn, 
Physiology; J. S. BILLINGS, 
Hygiene ; 
WILLIAM H. WELCH, Pathology; 
J. MCKEEN CATTELL, Psychology ; J. W. POWELL, Anthropology. 
Fripay, JUNE 14, 1901. 
CONTENTS : 
Washington Memorial Institution for Post-graduate 
Study and Research in Washington......... ....-++ 921 
Address of the President of the American Medical 
Association: DR. CHARLES A. L. REED.......... 924 
Variations in the Apical Plates of Arbacia Punctu- 
lata from Wood’s Holl, Muss: PROFESSOR 
HENRY LESLIE OSBORN........ ..-...20s0eceeeeerees 938 
Inorganic Ferments : PROFESSOR HARRY C. JONES. 940 
Scientific Books :— 
Crocker on Electric Lighting : PROFESSOR ELIHU 
THOMSON. Chemical Technology : PROFESSOR 
A. H. GILL. Lang’s Lehrbuch der Vergleichenden 
Anatomie der Wirbellosen Thiere: Dr. W. H. 
DALL. Ries on the Clays of New York: PRo- 
FESSOR J. F. KEMP............ Sean COE SPOOL OOS IEBAAE 943 
Scientific Journals and Articles... 
Societies and Academies :— 
The New York Section of the Ameri: an Chemical 
Society: DR. DURAND WOODMAN.............+- 
Discussion and Correspondence :— 
The Motion of a Top: PROFESSOR A. HALL. 
Modulus of Constant Cross Section: PROFESSOR 
THOMAS GRAY. Note on the Genus Hollandia 
of -Karschy: De RoO: Gi... scossce ces senee--2 2 948 
Current Notes on Physiography :— 
U. S. Geological Folios ; Rivers of East Yorkshire ; 
The Vogiland : PROFESSOR W. M. Dayis......... 950 
Notes on Oceanography :— 
An Oceanographical Museum; Marine Currents 
and River Deflection. DR. R. A. DALY........-- 951 
The New Mexico Biological Station: PROFESSOR 
Mo 1D) Jaks COOH RST noanogaqnebosenonsdceqasaca000000 954 
The Geological Society of America: PROFESSOR HER- 
MAN LEROY PAIRCHIDD....-...2.2...0.-..2es0necce 954 
Scientific Notes and News.........02ccscceesseceeeceneene 955 
University and Educational News 
MSS. intended for publication and books, etc., intended 
for review should be sent to the responsible editor, Pro- 
fessor J. McKeen Cattell, Garrison-on-Hudson, N. Y. 
WASHINGTON MEMORIAL INSTITUTION FOR 
POST-GRADUATE STUDY AND RE- 
SEARCH IN WASHINGTON. 
Durine the past winter and spring there 
has been in Washington an active move- 
ment having for its object the founding of 
an institution to facilitate the utiliza- 
tion of the various scientific and other 
resources of the Government for pur- 
poses of research. The aim is cooperation 
with universities, colleges and individuals. 
in rendering available to men and women 
the practical post-graduate training which 
cannot be obtained elsewhere in the United 
States and which is now available in Wash- 
ington to a limited degree only. 
The movement originated in the Wash- 
ington Academy of Sciences, which ap- 
pointed a committee to take charge of the 
matter. This committee consisted of the 
president of the Academy, Hon. Charles D. 
Walcott (chairman); Hon. Carroll D. 
Wright, Commissioner of Labor; Dr. C. 
Hart Merriam, of the Department of Agri- 
culture, and Mr. Marcus Baker, of the Geo- 
logical Survey. Communication was at once 
established with the board of trustees of the 
George Washington Memorial Association, 
whoappointed a committee to cooperate with 
the committee of the Washington Acad- 
emy, consisting of Mrs. Archibald Hopkins, 
president of the Association, Mrs. Phoebe 
A. Hearst and Mrs. L. M.D. Sweat. These 
