SCIENCE. 



[Vol. XV. No. 363 



COTTON DRESS GOOD?. 



SPRING 1890. 

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IMPROVED OIL LIGHT 



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MINERALS 



We have commenced our January Sale of 

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WALKER PRIZES IN NATURAL HISTORY. 

 f Natural History offers a first 

 a second prize of S50, for 

 n one of the following sub- 

 lesemblances of Plants in 

 On the Processes Invol 



prize of from S60 to Sioo, and 

 the best memoir, in Eiighsh. c 

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 in the Production of Soils. ,M 

 the Secretary before Ap: 

 awarded unless the pape 



5th, 1890. 



deemed of adequ 



; be handed 



ill not be 



For further particulars apply 



J. WALTER FEWKES, Secretarj-. 

 Boston, Mass., Dec. i8th, 1S89. 



One Tliousand Dollar Prize ! 



THE AMERICAN SECULAR UNION tfferaprize 

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PHILADELPHIA, Nov. 1889. 1707 C'sford St. 



Readers of Science 



Correspo)!ding with or visiting Advertisers, 

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H. Wiiiiderlicli & Co., 



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A large work of 200 pp. with .35 f uU-page illustra- 

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By Warren K. iioorehead, assisted by scientists 

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It IS complied from a careful survey and is correct 

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The entire summer was speni in surveying, exca- 

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Fort ALClent consists of 18,713.2 feet of erabank- 

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Price of book, $2 00. 



It will be ready for sale Jan. 10, 1890. 



Illustrated prospectus mailed tree to any address. 

 Send for one. 



WARREN K. MOOEEHEAD, 

 Smithsonian Institution, Washington, D.C. 

 Published by Eobt. Clarke & Co , Cincinnati. 



Correspondence solicited with parties 

 seeking publishers for scientific books. 

 N. D. C. HODGES, 



Publisher of Science, 



47 Lafayette Place, 



New York. 



JL'ST PUBLISHED. 



POPULAR MANUAL OF VISIBLE SPEECH AND 

 VOCAL PHYSIOLOGY. 



For u:e in Colleges and Normal Schools. Price 50 cents. 

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Old and Rare Books. 



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A. S. CLARK, 



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OLD BOOKS. Catalogue No. 6 Now Ready. Part 

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