SCIENCE 



Editorial Committee : S. Newcomb, Mathematics ; E. S. Woodward, Mechanics ; E. C. Pickeeistg, As- 

 tronomy ; T. C. Mendenhall, Physics ; R. H. Thurston, Engineering ; Ira Eemsest, Chemistry ; 

 J. Le Conte, Geology; W. M. Davis, Physiography; O. C. Marsh, Paleontology; W. K. Brooks, 

 Invertebrate Zoology ; C. Hart Merriam, Vertehrate Zoology ; S. H. Scudder, Entomology ; 

 N. L. Beitton, Botany ; Henry F. Osborn, General Biology ; H. P. Bowditch, 

 Physiology ; J. S. Billings, Hygiene ; J. McKeen Cattell, Psychology ; 

 Daniel G. Brinton, J. W. Powell, Anthropology. 



Friday, Wovember 22,-1895. 



CONTENTS: 



Glacial Phenomena between Lalce CJiamplain, Lake 

 George and Hudson River : G. F. WRIGHT 673 



Gill on the Early Segregation of Fresh-water Types... 678 



Dry Dredging in the Mississippian Sea : Charles 

 Schuchert 679 



Antidromic Problems : G. Maoloskie 681 



Typhoid Fever Disseminated through the ililh Sup- 

 ply : H. L. E0SSELL 682 



Eleventh International Congress of Americanists : 

 George Bruce Halsted 683 



Recent Investigations upon the Embryology and Pa- 

 thoUgy of the Teeth : H. F. 686 



Current Notes on Physiography {XIX. ): — 



The Marginal Plain of China; River Valleys of 

 the Himalayas ; Origin of the Valley of the Rhone : 

 W. M. Davis 687 



Scientific Notes and News 689 



University and Educational Neics 691 



Discussion and Correspondence: 

 The Inverted Image on the Retina : Charles S. 

 MiNOT. Shells as Implements: O. T. Mason. 

 A Reply : Frank C. Baker. Science and Cy- 

 clopasdias: LAWRENCE Ikwell 692 



Scientific Literature : — 



Wilson's Atlas of the Fertilization and KaryoTcine- 

 sis of the Omiin: CHARLES S. MiNOT. Bed- 

 dard's Monograph of the Order Oligochxta : W. 

 McM. WooDWORTH, Frank Smith. Harris' 

 Qualitative Chemical Analysis: JAS. Lewis 

 Howe. Parinaud's La sensihilite de I'ceil awx 

 couleurs spectrales : E. C. Sanford. Geology 

 of the Green Mountains in Massachusetts : J. F. 

 Kemp. Cross' Laccolitic Mountain Groups of 

 Colorado, Utah and Arizona : J. B. Wood- 

 worth. Keyes' Bibliography of North American 

 Paleontology : GILBERT VAN INGEN 695 



Societies and Academies : — 



Biological Society of Washington : F. A. Lucas. 

 Entomological Society of Washington : L. O. How- 

 ard. New York Academy of Sciences : J. F. 

 Kemp. The Geological Conference of Harvard 

 University. The Academy of Science of St. Louis : 

 A. W. Douglas 702 



Scientific Journals : — 



The Journal of Geology 707 



Neiv Books 708 



MSS. intended for publication and books, etc., intended 

 lor review should be sent to tbe responsible editor, Prof. J. 

 McKeen Cattell, Garrison on Hudson, N. Y. 



Subscriptions and advertisements should be sent to Science, 

 41 N. Queen St., Lancaster, Pa., or 41 East 49th St., New York. 



GLACIAL PHENOMENA BETWEEN LAKE 

 GHAMPLAIN, LAKE GEORGE AND 

 HUDSON RIVER.* 

 The area between the south ends of Lakes 

 Champlain and George and the Hudson 

 River presents many very intferesting glacial 

 phenomena. The watershed between the 

 basins of the St. Lawrence and the Hudson 

 pursues a very remarkable course. Half- 

 wa}'^ Bi'ook, a tributary to Wood Creek, 

 which enters Lake Champlain at White- 

 hall, rises within the limits of the city of 

 Glens Falls, upon the Hudson, and not 

 more than a quarter of a mile from the 

 Hudson. The brook occupies a broad, de- 

 serted river channel about one-half mile 

 wide, leading through deep deposits of sand 

 and gravel. ■ The elevation of the gravel 

 margins above the sea at Glens Falls is 343 

 feet; that of this deserted river channel is 

 from fifty to seventy-five feet lower. A dam 

 of twenty-five or thirty feet just above 

 Glens Falls would turn the Hudson River 

 through this old channel by way of Half- 

 way Brook and make it a tributary to the 

 St. Lawrence. 



* A paper read before Section E, at the meeting of 

 tlie A. A. A. S., at Springfield, Mass., August, 1895. 



