SCIENCE. 



[Vol. XVII. No. 419 



CALENDAR OF SOCIETIES. 



Anthropological Society, Washington. 



Feb. 8.— L. R. Klemm, City Life in the 



Middle Ages; Robert Fletcher, The Indian 



Messiah; W. H. Holmes, An Engraved Tablet 



from Tennessee. 



Biological Society, Washington. 

 Feb. 7. — C. D. Walcott, Discovery of Ver- 

 tebrate Life in Lower Silurian (Ordovician) 

 Strata ; Henry F. Osborn, A Review of the 

 Discovery of the Cretaceous Mammalia. 



Nevr York Academy of Sciences. 



Feb. 9. — A. R. Ledoux, Notes on a Visit 

 to the Sweet Grass Hills of Montana, and 

 Kootenai Lake, British Columbia; A. R. 

 Leeds, The Precipitation of Suspended Silt 

 and Clay in River Waters, and The Discov- 

 ery of a Starch-Digesting Ferment in Cow's 

 Milk, and its Relation to Nutrition. 



Feb. 16. — Wallace Goold Levison, Instan- 

 taneous Photography as an Aid to Science 

 History, and Art (illustrated by novel lau 

 tern views). 



Appalachian Mountain Club, Boston. 

 Feb, 11. — Rosewell B. Lawrence, The 

 Carolina Mountains. 



Wants. 



A 7iy person seeking a position for which A. 

 fied by his scientific attaintnen^s^ or any pers< 

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

 0/ a teacher of science^ chemist, draughtsman, or what 

 not, may have the * Want^ inserted under this head 

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

 able character of his application. A ny person seeking 

 information on any scientific question, the address of 

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

 umn for a purpose consonant with the nature of tk 

 paper, is cordially invited to do so. 



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. CLAKK, 

 Amherst, Mass. 



WANTED.— A young man who has been teaching 

 in a first-class Etigh 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. 



WANTED.— A situation in a scientific house by a 

 graduate of the scientific department of the 

 Jersey City High School as Geologist, Mineralogist 

 or as assistant teacher in Physics or assistant to a 

 chemist. Best of references. E, W. PERRY, 588 

 Third Street, Jersey City, N. J. 



LOW-PRICED BOOKS. 



Any of the following low-priced books will be 

 mailed postpaid on receipt of price. 



SCIENCE BOOK AGENCY, 



47 Lafayette Place, New York, 



Alte 



ELECTRICITY. 



Current Machinery. By G. Kapp. 



of the Secondary Batteries of Plante 



and Faure. By J. H. Gladstone and A. Tribe. 

 Dynamic Electricity. By John Hopkmson, J. A. 



Schoolbred, and R. E. Day. iS^* 



Dynamo-Electric Machines, Recent Progress in. 



By Professor Sylvanus P. Thompson. iS° 



Electric Bells. By F. C. Allsop. 12^ 



Electric Lighting from Central Stations. By G. 



Forbes 



Electricity. Supply of, by Xocal Authorities. 



By K. Hedges. S'' 



Electro-Magnetic Telegraph, A Hand-Book of 



the. By A. E. Lorincc- 18" 



Electro-Magnets. By^Th. Du Moncel. Tr. by 



C. J. Wharton 



Electro-Telegraphy. By F. S. Beecher. 16°.. 

 Incandescent Electric LightiNg. A Practical 



Description of the Edison System. By L. H. 



Latimer, C. J. Field, and J. W. Howell, iS°.. 

 Induction Coils : Ho^v Made and How Used. 



18° : 



Practical Dynamo-Building for Amateurs. By 



Frederick Walker. 18° 



Terrestrial Magnetism and the Magnetism of 



Iron Vessels. By Professor Fairman Rogers. 



iS*^ 



Thermo-Electricity. By A. Rust. 8° 



Wrinkles in Electric Lighting. By V. Stephens. 



SA.NITARY SCIENCE. 



Air We Breathe, the, and Ventilation. By Pro- 

 fessor H. A. Mott. i6« 



Bad Drains, and How to Test them. By R. H. 

 Reeves. 12° 



Dikty Dustbins and Sloppy Streets. By H. P. 

 Boulnois. 12° 



Disease and Putrescent Air. By T. Rowan. 8°.. 



Drainage of Towns. By J. Phillips. 8° 



Dwelling-Houses : Their Sanitary Construction 

 and Arrangements. By Professor W. H. Cor- 

 field. 18° 



Fashion in Deformity. By William Henry Flower. 



Food. The Composition, Digestibility, and Nu- 

 tritive Value of. By Professor Henry A. 



WANTED.— By a medical student of three 

 courses, a position on some "war or mercan- 

 tile vessel sailing between America and some for- 

 eign country, as Clerk, Assistant Physician or Drug- 

 gist, or any respectable occupation. Content with 

 a moderate remuneration. Highest commenda- 

 tions. W. L. S., SciCiice Office. 



TNPORMATION WANTED.— Clarence W. Bowen, 

 -L Secretary of the Committee on the Centennial 

 of Washington's Inauguration. 251 Broadway, New 

 York, desires information regarding the portraits of 

 John Hathorn and Jeremiah Van Rensselaer, mem- 

 bers of Congress from New York. These portraits, 

 for the Memorial Volume, are particularly desired, 

 to complete the list of portraits of the New York 

 delegation in Congress at the time of Washington's 

 inauguration. 



SCOUTS 



EMULSION 



Of Pure Cod 

 Liver Oil and 



of Lime and 



is endorsed and prescribed by leading I 

 physicians because both the Cod. Zivei- Oil i 

 and Hypophospliites are the recognize:! i 

 agents in the cure of Consumption. It Is I 

 as palatable as mills. i 



Seoff s Emulsion %ZiFi^''A\ 



is a tcondei'fal Flesli Producer. It is the 

 Best Merrcedy for CONSUR3FTION, I 



Scrofula, Bronchitis, Wasting- Dis- I 

 eases, Chronic Coughs and Colds. | 



Ask for Scott's Emulsion and take no other.; 



WANTED. — One flrst-class instrument-maker. 

 Apply by letter to T. C. MENDENHALL, Su- 

 perintendent V. S. Coast and Geodetic Survey, 

 Washington, D. C 



WANTED. — An Entomologist to accompany a 

 camping party of boys during July next. 

 Address, stating experience and salary expected. 

 ALBERT L. ARBY, Free Academy, Rochester, N.Y^ 



w 



ANTED.— A youDg man wishes a posith 

 experinieDt station, botanical department pr 



ferred. References and evidence of competency on 

 application. Address E E. BOGUE. Agr. Experi- 

 ment Station, Columbus, O. 



WANTED— Employment or partial employment 

 as naturalist collector for all Ornithological, 

 Entomological or Zoological specimens. First class 

 Canadian references supplied. Would be willing to 

 work in Canada or any part of America as desired 

 Salary or commission. G. E. ATKINSON, 639 Spa- 

 dina Ave., Toronto, Can. 



A UNIVERSITY GRADUATE IN SCIENCE, at 

 present a junior student in medicine at the Uni- 

 versity of Michigan, desires a position as teacher or 

 laboratory assistant. Special preparation in Zool- 

 ogy, Histology, Physiology and Human Anatomy. 

 Will also teach, if desired, Physics, Chemistry, Bot- 

 any, Entomology, Embryology, Bacteriology and 

 Sanitary Science. References and full particulars 

 on application. H. B., 20 East JefEerson St., Ann 

 Arbor, Mich. 



Exchanges. 



[Freeofcharge to all, if of satisfactory character. 

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

 York.l 



Fcr 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- 

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



1 would like to exchange first six vols. Roscoe and 

 Schorleminer's Chemistry, and Vols. 11. and III. of " Ed- 

 ucation ■" for American Naturalist for 1889 and iSgo, or 

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

 Ripon, Wis. 



I have a good 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. 



I wish to exchange Eastern Lepidoptera for those that 

 I do not have, particularly those found in the South. 

 Jos. F, Crandall, Honesdale. Wayne Co.. Pa. 



To exchange, i8go Seeger and Guernsey Cyclopedia, 

 containing a complete list of the manufactures and pro- 

 ducts of the U. S., and address of first hands, cost $6. 

 David R. Lewis, Sayhrook, 111. 



**■ The Week, one of the ablest papers on the con- 

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THE 



AMERICAN GEOLOGIST FOR 1891 



AND 



BIEN'S NEW ATLAS OF THE METROPOLI- 

 TAN DISTRICT, 



will be given to jVew Subscribers to the 



Geologist for $35.00 (which is the regular 

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THE BOTANICAL GAZETTE. 



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all its departments. 



25 cents a number, $2.50 a year. 



Address pofiLISHERS BOTANICAL GAZETTE, 



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