SCIENCK 



[Vol. XX. No. 501 



THIS OFFER 



Of TWO GREAT MAGAZINES, 

 S2.00 for One Year, 



Do Yon Know The^n ? 



GOLDTHWAITE'S GEOGRAPHICAL MAGAZINE. 



The only popular illustrated publication of its kind in the world. 

 Travels, Exploration's, Discoveries. FACTS, not FICTION. 



MINEBALS. 



A magazine treating in popular stjle of the Mineral Kingdom, a science 

 of which every one should have some knowledge. 



THEY ARE NOT TECHNICAL, 



BUT READABLE, AND FREE FROM DRY STATISTICAL DETAIL 



To know the world in which you live and all about its curious structure, you 

 should subscribe to and read these highly entertaining and instructive 



magazines. 



Regular price of G. G. M. one (i) year, $2.00. 

 " " " Minerals, " " " i.oo. 



BOTH PUBLIHIIED IIOXTHLY. 



Offered now for 12 MONTHS for Two Dollars ($2.00). 

 NOW is the time to ORDER ! 



WM. M. GOLDTHWAITE, 



79 Nassau St., NEW YORK. 



Sample copy 3IINEIIALS, lOc: G. G. 31., l->c: 



If you want a Map, Atlas, Globe or Phanisphere, Maps mounted, send to 

 GOLDTHWAITE'S GEOGRAPHICAL EXCHANGE. 



The American Geologist for 1892. 



Edited by Prof. S Calvin. University of Iowa; Dr. E. W. Claypolk, Buchtel CoUeKe; John Eyerman. 

 Lafayette CoUege ; Dr. Pkrsifor Fbazer. Penu. Hort. Soc; Prof. P. vv. Craoin, Colorado College; 

 Prof Rob't T. Hill, U. S. Irrigation Survey; Dr. Andrew C. Lawson. University of California; R. D. 

 Salisbury, University of Wisconsin; Joseph B. Tyrrell, Geol. Sur. of Canada; E. O. LTlbich, Minnesota 

 Geological Survey: Prof. I. 0. White. University of West Virginia; Prof. N. H. Winchell, University 

 of Minnesota. Now in its IXth volume. $3.50 per year. Sample copies, 20 cents. Address 



THE GEOLOGICAL PUBLISHING CO., Minneapolis, Minn. 



PERIODICALS. 



" The Magazine for Hot Weather." 



i^REVIEW-REVIEWS! 



is "A Summer Magazine" 



BECAUSE—" If one has only ten mi 

 every day to read, he can keep 

 oughly posted on the events c 

 " ■ )rld by reading this val 



-Seattle Press-Times. 



f the I 



publicatio 



BECAUSE- 



welland 

 tionalist. 



is illustrated lavishly and 

 ndispensable." — Congrega- 



BECAUSE-"It is the best i 



through which a busy man 



abreast."— C/ia»Hce(/ M. Depew. 



BECAUSE— "The 'Reviewrof R 



always i 

 BECAUSE- 



iteresting. 



'The 



furnishes ideas f 



none of their o 



mercial Advertiser. 



BECAUSE— It make 



iual bright and trcn- 

 )f literary novelties 

 or people v/ho have 

 wn."— fl/ew York Com- 



» FIVE MONTHS FOR ONE DOLLAR. 



^ AGENTS 



THE Review OF Reviews,! 



13 ASTOR PLACE, N, Y. 



The Busy MflN's. M AGftZiNE" 



EDUCATIONAL. 



Walker Prizes in Natural History. 



The Boston Society of Natural History 



offers a first prize of from $tj0 toiflOOand a second 

 prize of a sum not exceeding S50, for the best 

 memoirs, in English, on the following subject: 



CONTRIBUTIONS TO OUR KNOWLEDGE OP 

 THE LIFE-HISTORY OF ANY PLANT OR ANI- 

 MAL. 



Each memoir must be accompanied by a sealed 

 envelope, enclosing the author's name and super- 

 scribed by a motto corresponding to one borne by 

 the manuscript, and must be handed to the Secre- 

 tary on or before April 1, 1893. 



the memoirs 



For further particulars apply to 



SAMUEL HENSHAW, Secretary. 



Boston, July 3b, 1892. 



The Observer. 



Published Monthly at Portland, Conn. 

 A MEDIUM OF INTERCHANGE OF OBSERVATIONS FOR ALL 



STUDENTS AND LOVERS OF NATURE. 



E. F. BIGELOW, Editor and Publisher. 

 ASSOCIATE EDITORS: 

 M. A. BOOTH, F.R.M.S., Microscopy, Longmeadow, Mass. 

 J NO. H. SAGE, Ornithology, Portland, Conn. 



A. W. PEARSON, Entomology, Norwich, Conn. 



C. A. SHEPARD, Botany, New Britain, Conn. 



C. A. HARGRAVE, Conchology, Danville, Ind. 



F. P. GORHAM, Geology, 103 Knight St., Providence, R. I. 

 Yearly Subscription, $1. Single Wtimher, lO Cents. 



Minerals, 



Rocks, 



Fossils, 



Caiiits of Fossils, 



Oeolo^ical 



Relief Maps. 



Ward'sNatural Science Establishment 



Mineralogy, Geology, Paleontology, Zoology, Osteology, Anatomy. 



Send for Circular. ROCHESTER, N. Y. 



StuflTed Animals 



and Skins, 



Mounten 



Skeletons, 



Anatomical 



Models 



IwTcrtebrates 



