November 20, 1891.J 



SCIENCE. 



293 



negro problem. It opens with an account of the earh'est and un- 

 successful attempis to plant a negro colony in Africa, and then 

 proceeds to trace tlie leading events in the histoiy of Liberia from 

 its foundation to tlie jirestnt lime. Tlie difiSculties and distresses 

 of tlie past fi'w ypars having been surmounted, the colonists have 

 had considerable time to sliosv what thej* are capable of and what 

 may be expected of them in the way of government and civiliza- 

 tion; but. unfortunately, their record is not so good as might be 

 wished. Mr. McPlierson defends them as well as he can, but he 

 .is obliged to admit that they have incurred a public debt, the in- 

 terest of which they are uuable to pay, and for which they have 

 nothinii: wbatever to show. Moreover, their presence in Africa 

 has not as yet had any practical influence in civilizing the natives; 

 and all attempts to propagate Christianity among the native 

 tribes have proved unavailing, while Mohammedanism is spreading 

 among the same tribes with great rapidity. On the whole, it 

 would be neither surprising nor regrettable if, as Mr. McPherson 



fears, the little republic should eventually be brought under the 

 sovereignty of Great Britain. Mr. McPherson's pamphlet is pub- 

 lished by the Johns Hopkins Press, at fifty cents. 



— It is not, sajs Iron, generally known that the light of the 

 sun and the moon exercises a deleterious effect on edge tools. 

 Knives, drill-;, scythes, and sickles assume a blue color if tliey are 

 exposed for some time to the light and heat of the sun ; the sharp 

 edge disappears, and the tool is rendered absolutely useless until 

 it is retempered. A similarly prejudicial effect has been exercised 

 by moonlight. 



— Steps have been taken, we learn from The Publisher's Weekly, 

 to establish an "Authors' Museum" in St. Petersburg, to contain 

 mementos and relics of famous Russian literary men and women. 

 It is probable that the Pu?chkin Museum in the Lyceum, and the 

 Seraiontoffi Museum in the Nikolai Cavalry School, will be incor- 

 porated in the new institution, if completed. 



A^mc 



A most excellent and agree- 

 able tonic and appetizer. It 

 nourishes and invigorates the 

 tired brain and body, imparts re- 

 newed energy and vitality, and 

 enlivens the functions. 



Dr. Ephraim Bateman, Cedarville, N. J., 

 says: 



*' I have used it for several years, not only 

 in my practice, but in my own individual 

 case, and consider it under all circumstances 

 one of the best nerve tonics that we possess. 

 For mental exhaustion or overwork it gives 

 renewed 'strength and vigor to the entire 

 system . ' ' 



Descriptive pamphlet free. 



Rumford Chemical Works, Providence, R. I. 



Be^vare of Substitutes and Imitations. 



CAUTION.— Be sure tlie Avord "Hors- 

 ford's'' is oil tlie label. AM otliers are 

 spurious. Never sold iii bulk. 



Exchanges. 



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

 Address N. D. C. Hodges, 874 Broadway, New York.l 



For sale.~A 6J^ x S}4 Camera; a very fine instrument, 

 with lens, hold^^rs and tripod, all new; it cost over $40; 

 price, S25. Edw. L, Hayes, 6 Athens street, Cambridge, 

 Mass. 



To exchange Wright's " Ice Age in North America" 

 and Le Conte's "Elements of Geology" (Copyright 1882) 

 for "Darwinism," by A. R.Wallace, "Origin of ' " 



by Darwin. "Descent of Man" " " 

 Place in Nature,'* Huxley, ''M 

 mals," by Romanes, "Pre-Adam 

 books wanted except latest edit 

 condition. C. S. Brown, Jr., 

 Nashville, Tenn. 



Wants. 



by D; 

 ntal Evolution in Am- 

 ies," by Winchell. No 

 ons, and books in good 

 Vanderbilt University, 



For Sale or Exchange for books a complete private 

 chemical laboratory outfit. Includes large Becker bal- 

 ance (aoog to i-iomg ), platinum dishes and crucibles, 

 agate motors, glass-blowing apparatus, etc. For sale in 

 part or whole. Also complete file of Sillimatis Journal^ 

 1862-1885 (62-71 bound); Smithsonian Reports, 1S54-1883; 

 U. S. Coast Survey. i8';4-i86c). Full particulars to en- 

 quirers. F. GARDINER, JR., Pomfret, Conn. 



For exchange or sale at a sacrifice, an elaborate micro- 

 scope outfit. Bullock stand; monocular objectives, one- 

 sixth homeogeneous immersion, four-tenths, and three 

 inch, Bausch & Lomb, also one-fourth and one inch 

 Spencer. Four eye-pieces. Objectives are the best made. 

 Address Mrs. Marion Smith, 41 Branch Street, Lowell, 

 Mass. 



For sale or exchange, extra fine pair ( 3 and S ) of skins 

 of Rocky Mountain Goat, with the skulls, etc., as needed 

 for mounting; collection of vertebrate fossils from the 

 Coup Fork Tertiary of Kansas; collection nf works on 

 descripiive cryptogamlc botany — mostly on Fungi; thir- 

 teen vols, of Botanical Gazette^ eight vols. GreviUeay 

 four vols. Notarisea; slereopiicon outfit, with attach- 

 ment for rnicrosccpic projecti n ; 148 stereoptJcon slides, 

 illustrating zoology and Cryptogams. Wanted — 

 and foreign works and pamphlet^s on Vertebrate Pal; 

 tology, and series o'i Am, Jour , of Science ^xi^ o\.\itr 

 odicals containing contributions to Vertebrate Pal; 

 tology. Prof. F. W. Cragin, Colorado Springs. Colo, 



Old and Rare Books. 



JACK NUMBERS and complete sets of leading Mag- 

 1 azmes. Rates loiv. AM. MAG. EXCHANGE. 

 Schoharie N V 



A 7iy person seeking a position for 'which he is qiial 

 fied by his scientijic attainments^ or any person seeking 

 some one to fill a position of thu character^ be it that 

 of a teacher of science-^ chemist^ draughtsman^ or what 

 not^ may have the ' Want'' inserted under this head 

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

 able character of his application. A ny person seeking 

 information on any scieyitifc question, the address t?/ 

 any scientific ma7t^ or ivho can in any ivay use this col- 

 umn for a purpose consonant jvith the nature of the 

 paper ^ is cordially invited to do so. 



WANTED.— A position in the philosophical or 

 pedagogical department of a college or uni- 

 versity by a young man (30) who has had five years'* 

 practical experience in teaching, and who has done 

 four years' post-graduate work in philosophy, demot- 

 ing his attention during the last two years espe- 

 cially to study and original investigation in scien- 

 tific psychology and its applications in educaflon. 

 Address E, A., care Science, 874 Broadway, N. Y. 

 City. 



WANTED.— A suitable position in Washington, 

 D. C, not connected with the GoverDtnent, 

 and with a salary not to exceed S650 a year, by an 

 experienced biologist with six years' university 

 training. Applicant has been a skilful surgeon for 

 fourteen years; is a practical photographer, char- 

 tographer, and accustomed to the use of the type- 

 writer. He is also capable of making the most fin- 

 ished drawings, of any description, for all manner 

 of illustrative purposes in science; trained in mu- 

 seum methods and work; also field operations and 

 taxidermy in its various departments, and model- 

 ing, production of casts, restorations of potaconto- 

 logical specimens and similar employments. Address 

 U. S. R., care Science, 47 Lafayette Place, N. Y. 



WANTED.-By a young man (27), B.A. and Ph.D., 

 with three years' experience as assistant in 

 chemistry, position as instructor in chemistry or in 

 natural sciences in college or academy, or other ad- 

 vantageous position as chemist. Give particulars 

 as to work, salary, etc. F. W. MAR, L. Box 23, West 

 Haven, Conn. 



A YOUNG MAN with an M.S. degree from Cornell 

 ITniversity desires a position as Professor or 

 Instructor in Physics or Electrical Engineering. 

 Address M. V. F., care Science, 47 Lafayette Place, 

 New York. 



WANTED— A position as Professor of Science by 

 a teacher of experience who has taken a post- 

 graduate course in biology. Address BOTANIST, 

 care Science, 47 Lafayette Place, New York. 



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N. D. C. HODGES, 874 Broadway, New York. 



