SCIENCE. 



[Vol. XVII. No. 431 



CALENDAR OF SOCIETIES. 

 Biological Society, Washington. 

 May 3.— Theo. Gill, On the Classification 

 of the Apodal Fishes; B. T. Galloway, Re- 

 cent Progress in the Study of Plant Dis- 

 eases; Frank Baker, Notes on Dwarfs; 

 Charles Hallock, Distribution of Fishes by 

 Underground Water-courses; F. C. Test, 

 Notes on the Dentition of Desraognathus ; J. 

 M. Holzinger, Incentives to Natural History 

 Work. 



New York Academy of Sciences. 

 May 4. — L. H. Laudy, Electric Meters. 

 Boston Society of Natural History. 

 May 6.— C. S. Minot, Evolution of the 

 Head. 



PENSIONS 



THE DISABILITY BILL IS A LAW. 



Soldiers Disabled Since Ihe War are Entitled. 



Dependent widows and parents now dependent 

 whose sons died from effects of army service are in- 

 cluded. If you wish your claim speedily and sue- 



"^^^'"■i^aSreir^"'^ JAMES TANNER, 



Late Commissioner of PensiODs, ^Vashington, D.C. 



"C'OR SALE.-- 



AN DER SEE. Reisebriefe aus dem Moore 

 und von der Nordsee. Von Dr. Ernst 

 Doges. (1884.) 178 p. 12". 25c. 



DIE KOLONIALREICHE UND KO- 

 LONISATIONSOBJEKTE DER GE- 

 GENWART. Kolonialpolitische und 

 kolonialgeographische Skizzen von Dr. 

 Emil Deckert. Leipzig, 1885. 340 p. 12". 

 25c. 



REISEERINNERUNGEN AUS AL- 

 GERIEN UND TUNIS. Von Dr. W. 

 Kobelt. Frankfurt am Main, 1885. Illus- 

 trated. 480 p. 8". 75c. 



TRANSMISSION ELECTRIQUE DU 

 TRAVAIL MECANIQUE. Determina- 

 tion des Elements de la Transmission. Par 

 A. Hillairet. Paris, 1884. Illustrated. 

 79 p. 8". 25c. 



DIE BEZIEHUNGEN ZWISCHEN 

 GEISTESSTORUNG UND VER- 

 BRECHEN. Nach Beobachtungen in der 

 [rrenanstalt Dalldorf von Dr. W. Sander 

 und Dr. A. Eiehter. Berlin, 1886. 404 p. 

 8°. 75c 



BLATTER FUR GEFANGNISS- 

 KUNDE. Organ des Vereins der deuts- 

 chen Strafanstaltsbeamten. Eedigirt von 

 Gustav Ekert. Neunzehnter Band, 1 u. 2 

 Heft. Heidelberg, 1884. 151 p. 8°. 35c. 



KRITISCHE UND EXPERIMEN- 

 TELLE BEITRAGE ZUR LEHRE 

 VON DER FUTTERUNGSTUBER- 

 CULOSE. Von Dr. F. Wesener. Frei- 

 burg, 1885. 98 p. 8". 35c. 



GEDENKTAGE DER PSYCHIATRIE 

 ALLER LANDER. Von Dr. Heinrich 

 Laehr. Berlin, 1885. 66 p. 8°. 50c. 



SCIENCE BOOK AGENCY 



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For sale, or exchange for geological works, the follow- 

 ing worl<s in anatomy, all latest editions: Allan, Tuain, 

 Gray, Le'dy, Massey. and Rollestin's Forms of Animal 

 Life. S. W. WilUston, Lawrence. Kan. 



Will exchange a new Thomson reflecting astatic gal- 

 vanometer, about 6,000 ohms, marie by Clark, Muir- 

 head & Co , London, and costing £3n, with i-g, i-gg, 

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For exchange — Fossil leaves from the Laramie beds of 

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For Sale or Exchange— All forms and species of Cana- 

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 ural history specimens. First class specimens only sup- 

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1 would like to exchange first six vols. Roscoe and 

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