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: 8S. NEWcomMsB, Mathematics; R. 8S. WoopDWARD, 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. Brooks, C. HART MERRIAM, Zoology ; S. H. ScupDDER, Entomology ; C. E. BESsEY, 
_N. L. Brirron, Botany; C. S. Minot, Embryology, Histology; H. P. BowpitcnH, 
Physiology; J. S. BILLINGS, 
Hygiene ; 
WILLIAM H. WELCH, Pathology ; 
J. MCKEEN CATTELL, Psychology ; J. W. POWELL, Anthropology. 
Fripay, Maron 15, 1901. 
CONTENTS: 
Physical History of the Rocky Mountain Region in 
Canada: DR. GEORGE M. DAWSON............... 401 
Stereoscopic Study of the Moon: G. K. GILBERT... 407 
Further Study of the Unit System of Laboratory Con- 
struction: PROFESSOR CHARLES 8. MInot.... 409 
The New York State Science Teachers’ Association : 
PROFESSOR CHARLES WRIGHT DODGE........... 415 
Scientific Books :-— 
Turner on Knowledge, Belief and Certitude : PRO- 
FESSOR R. M. WENLEY. Ewart’s Penycuik 
Experiments: PROFESSOR T. D. A. COCKERELL. 
The Geological Survey of Canada: Dr. H. M. 
Ami. The Crotons of the United States. Pro- 
_ ceedings of the American Association for the Ad- 
vancement of Science. Books Received...........-. 422 
Scientific Journals and Articles............0.0.ceseeceeee 425 
Societies and Academies :— 
Geological Society of Washington: DR. F. L. 
RANSOME and DAVID WHITE. The Biological 
Society of Washington: F. A. Lucas. Philo- 
sophical Society of Washington: CHARLES K. 
WEAD. American Mathematical Society: PRo- 
FESSOR F. N. CoLE. The Academy of Science of 
St. Louis: PROFESSOR WILLIAM TRELEASE... 426 
Discussion and Correspondence :— 
A Field for Mosquito Theorists: G. R.S.......... 431 
Shorter Articles :— 
Are the Australian Marsupialia of Opossum Deri- 
vation: B. ARTHUR BENSLEY. Work at the 
Marine Biological Laboratory at Wood’s Holl. 431 
Notes on Inorganic Chemistry: J. L. H.......-....- 434 
LAQOUDTEGTS ISMES5pan6 3000000 sboncoqnosaceoded7eGacd a|G00F000 435 
INOUE JRARSBoconcdaboncaqoansaoonosnogancopsdososcepaaensqetond 435 
The Association of American Universities.............. 436 
The Naval Observatory .........0:ceecceeeseoeceee seneeees 437 
Scientific Notes and News..........:..s0ccesseeeeeeeeeeees 438 
University and Educational News..........+.0....++0+ 440 
’ 
MSS. intended for publication and books, etc., intended 
or review should be sent to the responsible editor, Pro- 
fessor J. McKeen Cattell Garrison-on-Hudson, N. Y. 
PHYSICAL HISTORY OF THE ROCKY MOUN- 
TAIN REGION IN CANADA.* 
Ir will now be endeavored to briefly re- 
view the orographic changes and the con- 
ditions of deposition of which the geological 
column gives evidence—in other words, to 
touch in outline the main facts of the phys- 
ical history of the Rocky Mountain region 
of Canada. 
Regarding the Archean, it need only be 
said that here, as in most parts of the 
world, we find, beneath any rocks that can 
be assigned to the Cambrian in the most 
extended sense of that term, and appar- 
ently separated from these rocks, by a 
great break and unconformity, a crystal- 
line series or ‘fundamental complex’ com- 
posed of plutonic rocks with highly met- 
amorphosed and vanishing sedimentary 
rocks in seemingly inextricable association. 
The similarity of this basal series in differ- 
ent parts of the world is so great as appar- 
ently to imply world-wide and approxi- 
mately contemporaneous conditions, of a 
kind perhaps differing from any that can 
have occurred at later periods. The re- 
gion here described is not, however, an 
ideal one for the study of these Archean 
rocks, because of the extreme metamor- 
phism by which much newer formations 
* Concluding section of the address of the Presi- 
dent of the Geological Society of America, the late Dr. 
George M. Dawson, read before the Society on Decem- 
ber 29, 1900. 
