SCIENCE. 



[Vol. XVII. No. 429 



CALENDAR OF SOCIETIES. 



New England Meteorological Society. 



April 18.— J. Warren Smith, The methods 

 of the United States Signal Service (with 

 exhibition of charts furnished by the chief 

 signal-officer) ; W. M. Davis, Weather Maps 

 in Foreign Countries (with exhibition of 

 samples) ; A. Lawrence Rotch and N. Helme, 

 Local Predictions; and H. H. Clayton, Long- 

 Range Predictions. 



American Academy of Political and Social 

 Science. 

 April 17. — Emory R. Johnson, 'Ihe River 

 and Harbor Bills. 



Biological Society, Washington. 



April 18.— H. E. Van Deman, The Recent 

 Introduction of Date- Palms; B. T. Galloway, 

 Recent Observations on a Bacterial Disease 

 of Oaks; L. F. Ward, Some Florida Plants; 

 Cooper Curtice, Practical Value of Investi- 

 gating Parasites of Live-Stock ; Theo. Holm, 

 Abnormal Flowers in Glyceria. 



-pOE SALE.— 



AN DER SEE. Eeisebriefe aus dem Moore 

 und von der Nordsee. Von Dr. Ernst 

 Doges. (1884.) 178 p. 13". 25c. 



DIE KOLONIALREICHE UND KO- 

 LONISATIONSOBJEKTE DER GE- 

 GENWART. Kolonialpolitische und 

 kolonialgeographische Skizzen von Dr. 

 Emil Deckert. Leipzig, 1885. 240 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. 



IE BEZIEHUNGEN ZWISCHEN 

 GEISTESSTORUNG UND VER- 

 BRECHEN. Nach Beobachtungen in der 

 [rrenanstalt Dalldorf von Dr. W. Sander 

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

 8°. 75c 



BLATTER FUR GEFANGNISS- 

 KUNDE. Organ des Vereins der deuts- 

 chen Strafanstaltsbeamten. Redigirt von 

 Gustav Ekert. Neunzehnter Band, 1 u. 2 

 Heft. Heidelberg, 1884. 151 p. 8°. 25c. 



KRITISCHE UND EXPERIMEN- 

 TELLE BEITRAGE ZUR LEHRE 

 VON DER FUTTERUNGSTUBER- 

 CULOSE. Von Dr. F. Wesener. Frei- 

 burg, 1885. 98 p. 8". 25c. 



ZUR KUNSTLICHEN ERNAHRUNG 

 DER SAUGLINGE IN DEN DREI 

 ERSTEN LEBENSMONATEN. Ex- 

 perimentell plinische Untersuchung von 

 Dr. H. Schoppe. Tiibingen, 1884. 82 p. 

 8°. 25c. 



GEDENKTAGE DER PSYCHIATRIE 

 ALLER LANDER. Von Dr. Heinrich 

 Laehr. Berlin, 1885. 65 p. 8°. 50c. 



SCIENCE BOOK AGENCY 



47 I*afayette Place, New York, 



Wants, 



A 7iy person seeking a position, /or "which he is quali- 

 fied by kis scientific attaininen^s^ or any person seeking 

 some one to fill a position of this character, be it thai 

 ofi a teacher of science^ chemist^ draughtsman^ or ivhat 

 not. may have ihe ' Want^ inserted under this head 

 FREE OF COST, if he Satisfies the publisher of the suit- 

 able character of his application. Any person sefkirt^ 

 information on any scientific guestions the address of 

 any scientific man., or who can in any way use this col- 

 li 7nn for a purpose consonant with the nature of the 

 paper., is cordia'lly invited to do so. 



w 



ANTED— A position in some College, Norma^ 

 , , School or Academy to teach Biology, Physiol- 

 ogy. Comparative Anatomy, Histology, Embryology 

 or "Botany. A graduate of the University of Wiscon- 

 sin Have had four years' experience as a teacher. 

 Address "BIOLOGIST," care Science. 



^■ITANTED.— All of Vol. I. of Journal of Analytical 

 VV Chemistry, published at Easton, Penn. State 

 price and condition. Science Book Agency, 47 

 Lafayette Place, New York^ 



WANTED— A position in a Summer School of 

 Gymnastics to teach any one or more of the 

 following named physical exercises, viz.: Fencing 

 (to ladies especially). Sparring, Club Swinging, 

 Wands, Chest Weights and Free Movements. Am 

 prepared to offer very favorable terms to any school 

 desirin-' such work. WILLIAM FINDLAY, Propri- 

 etor of Pbila. Inst, of Phys. Cult., 1009 Arch Street, 

 Philadelphia, Pa 



A HARVARD M A., especially interested in Nat- 

 ural History, would like to learn of some out- 

 door occupation for the summer. Remuneration a 

 secondary object. SUMMER, Science OfBce. 



A CHEMIST, taking P. G. work in the Scientific 

 Department of one of our best colleges, would 

 like to negotiate for some industrial position, where 

 his knowledge would be of avail. Can furnish best 

 of references. R. S. W., Box 691. Amherst, Mass. 



WANTED— A position to teach Electrical Engi- 

 neering by a student from leading English and 

 French and U. R. science schools, or would accept 

 position as Consulting Electrical Engineex, Electri- 

 cian etc Verv highest testimonials London & 

 Hartford Publishing Co., N. Y. (International Press 

 Department.) 



WANTED.— A young man in college would like a 

 position during the summer of 1891 in some 

 scientific work, particularly Orinthology, either as 

 an instructor or tutor, or in making collections or 

 accompanying some scientific expedition. Can give 

 good references. Address HUBERT L. CLARK. 

 Amherst, Mass. 



WANTED.— A young man who has been teaching 

 in a flrst-olass High School desires a position 

 in a similar institution. Is competent to teach 

 Mathematics, Latin, Book-keeping, and the English 

 branches Can give highest references Address H. 

 W MARTHENS, 6208 Broad St., Pittsburgh, Pa. 



Exchanges. 



[Free of charge to all, if of satisfactory character. 

 Address N. D. C. Hodges, 47 Lafayette Place, New 

 York.l 



Will exchange a new Thomson reflecting astatic gal- 

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

 head & Co , London, and costing £3'^, with 1-9, 1-99, 

 i-ggg, shunts, lampand fscale, for a Weston voltmeter 

 and ammeter, or arge Wheatstone bridge, dial pactern, 

 or a portable testing outfit. Address G. A-, Science 

 Office, 47 Lafayette Place, New York. 



For exchange — Fossil leaves from the Laramie beds of 

 South Table Mountain, near Golden, Col., for other fos- 

 sils, historical relics, or minerals. Address John B. Gar- 

 vin, State School of Mines, Golden, Col. 



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

 dian birds, mammals, insects, reptiles, fish or other nat- 

 ural history specimens. First class specimens only sup- 

 plied. G. E. Atkinson, 639 Spadina Ave., Toronto, Can. 



I would like to exchange first six vols. Roscoe and 

 Schorleminer's Chemistry, and Vols. II. and III. of " Ed- 

 ucation " for American Naturalist for i88g and i8qo, or 

 works on Zoology. C. Dwight Marsh, Ripon College, 

 Ripon, Wis. 



I have a gocd supply of Eastern Coleoptera which I 

 wish to exchange for species not in my collection. Mel- 

 andryidae and Oedemeridae especially desired. Joe C. 

 Thompson, Rosebank P. O., Box 73, S. I. 



As a Flesh Producer there can be 

 no question but that 



SCOTT'S 



EMULSION 



Of Pure Cod Liver Oi! and Hypopiiosphites 



Of Lime and Soda 

 is 'Without a rival. IMany have 

 g-ained a pound a day by the use 

 of it. It cures 



CONSUMPTION, 



SCROFULA, BRONCHITIS, COUGHS AND 

 COLDS, AND ALL FORMS OF WASTING DIS- 

 EASES. AS PALATABLE AS MILK. 

 JBe sure you get the genuine as there are I 

 [ poor imitations. 



Protection from Lightning 



SPARE THE ROD AKD SPOIL THE HODSE ! 



To dissipate the energy of a ligfhtning dis- 

 charge, — to prevent its doing harm, — it is 

 necessary that something should be placed in 

 its path upon which its energy (capacity for 

 causing damage) may be expended. The 

 Patent Lightning Dissipater is specially de- 

 signed to serve this purpose, and will be 

 sent prepaid, with full directions for its ap- 

 plication, to any part of the United States, not 

 previously taken by agents, on receipt of $7.00. 



Correspondence solicited. 



AGENTS WANTED. 



N. D. C. HODGES, 



47 Lafayette Place, N. Y. 



THE DOLLAR TYPEWRITER 



A perfect and prantical Type Writing macTiine for only ONE 

 DOLLAR. Exactly like cut;re!nilar Kemlngton type; does 

 • 3 quality of work; takes a fools cap sheet. Co: 





; does all of the work of 

 a hi-rh priced" machine.' Speed, 15 to 35 words a niintite. 

 Size:3s«9 Inches; weiKht.iaoz; JIENTIO.N THIS IMPER. 

 Satisfaction guaranteed; Circulars free; AGENTS WANTED, 

 Sent by express for SI.OO; by mail, 15o eitrafor postage. 

 B. II. INGtRSOLL&BEO., eiCOKTLAIiDISI., N.T. CITJ. 



ninerals, 



Rocks, 



Fossils, 



Casts of Fossils, 



Ceological 



Relief maps. 



Ward'sNatiiral Science Establislinient 



Mineralogy, Geolo^, Paleontology, Zoology, Osteology, Anatomy. 



Send for Circular. ROCHESTER, N. Y. 



stuffed Animals 



and Skins, 



mounted 



Skeletons, 



Anatomical 



Models, 



Invertebrates. 



