SCIENCE. 



[Vol. XI. No. 276 



BOOKS 

 PREPARATION 



By John Wiley &. Sons, New York. 



A Text-Book for Agricultural Collegfs. 



Rocks and Soils. 



A Trealise on the Chemi-^try of Geologic Transformations 

 and Soil Coniposilion Bv H, E. Stockl)ridge, Ph.D., 

 Professor of Chemislrv and Geology, Imperial College of 

 Agriculture, Jap.^n. Svo, cloth $300 



An Elementary Course of De- 

 scriptive Geometry. 



By Solomon Woolf, A.M., Pn.fes^or of Geometry .ind 

 Drawing, College City of New York. Svo, cloth. 



Microscopical Physiogaphy of 

 Minerals and Rocks. 



By H. Rosenbusch, Translated hy Joseph P Iddings, 

 United States Geological Survey, Washingt.,n. D.C Vol. 

 I. — Minerals. With many fine illu-lraliuns. Svo, cloth. 



Differential Equations 



A Mathe 



ally prepared with ref 

 se. By Prof. W W. 



erence to a Fost-Graduale Cc 

 John.son. Svo, cloth. 



A Grammar of the Hebrew Lan- 

 guage. 



With copious Appendices. Bv W. H. Green, D.D., Pro- 

 fessor in Princeton Theological Seminary New stereo- 

 type edition, thoroughly revised and brought up to pres- 

 ent time. Svo, cloth. 



A Treatise on Hydraulics 



Designed as a Te.xt-Rook for Technical Schools, and for 

 the Use of Engineers. Kv Prof. Mansfield Merriman. 

 Svo, clulh 



Tables on the Properties of Sat- 

 urated Steam and other 

 Vapours 



By Prof C H Peabody of the Massachusetts Institute 

 0/ Technology. Svo. 



Thermo-Dynamics . 



By Prof. C. H. Peabody, B.S. Svo. 



litiMal \m and Anns 



tf 



WITH RUBBER FEET AND HANDS. 



The engraving is from an in 

 stantaneous photograph of a man 

 ascending a ladder. He has two 

 artificial legs substituting his nat- 

 ural ones, which were crushed bv 

 a railroad accident and subse- 

 quently amputated, With his 

 rubber feet he is able to ascend 

 or descend a ladder, balance 

 himself on the rungs, and have 

 his hands at liberty. He can earn 

 a good day's wages at ihe bench. 

 He can walk and mingle with per- 

 sons without betraying his loss ; 

 in fact he is restored to his former 

 self for all practical purposes. 



With the old methods of com- 

 plicated ankle-joints an undertake 

 kind would be a 



peril of the 



rubber feet he 



all sorts of ope-a 



Over eight tho 



use, scattered in 



r, but with th 

 m venture int^ 

 ons with safety 

 ;and inpractica 

 ill parts of th( 



of 400 pages, ■ 



tho 



alss 



endon 



-rly 



)tho 



ficial legs o 



description ot^ iheir case 

 same will be sent to physi 

 and surgeons free of charge. 



A. A.^MAPKS, 

 701 Broad^vay, New York 



PORTRAIT OF AGASSIZ. — Chapter 94 of The 

 Agassiz Association has for sale photographs of 

 Prof Louis Agassiz 75 cents. Address C. B. Stebbin's, 

 30 Day St., Somerville, Mass. 



■. THE BERLITZ SCHOOL OF LANGUAGES. . 



SUMMMER COURSE 



AT ASBURY PARK, N. J., AND AT OLD ORCHARD BEACH, ME. 



:ed by all first-cla 



The P.erlilz MelhotI is aclinnwlei 

 uiral method- ln^lruclion will be giv 

 native leachers are cnii liyed. The'ir I 

 insiruction highly inieresiing and eniin 



For sample pages of the French and the German book.s. 



and European authorities as I 



Dv the regular profes.si.rs ..f the Kerlilz Schools, where < 



; e.\p-rience and unparalleled sncce>s in teaching languages 



J emineiuly practical. The cour.-e consists of numerous lessons, lect 



h and German conversation. The terms are very low. A special 



irculars, etc , apply to 

 BERLITZ & CO , W. Madi! 



he best of all na 

 miy the best o 

 will make iheii 



30 Square, N.Y. 



SCHOOL OF MINES, 



— Columbia College — 



Sufflflier Uhool in Chemlstrj. 



The Laboratories of the School of Mines will be open 

 from June 15th, to September rsth, for special students 

 in general chemistry, qualitative, quantitative, and sani- 



The fees are $50 for the three months, or $5 for each 

 week or part of a week. 



For further information apply to 



Registrar, School of Mines, 



4gth St. and Madison Ave., N. Y. City. 



Positions Vac a n L 



■ Inquiries from employers in want of those skilled in any 

 department of science in its widest sense will be inserted 

 in this column WITHOUT CHARGE. 



The labor and expense involved in ascertaining what 

 positions are open, in gratuituously advertising them and 

 in attending'to the correspondence of applicants, are in- 

 curred in the interest and for the exclusive benefit of 

 subscribers to Science. 



Applicants should inclose the necessarj' postage, for 

 forwarding their letters. 



1— AProfessor will be appointed by the Board of Vis- 

 itors to the Chair of Biology and Agriculture in the Uni- 

 versity of Virginia, on the J^\.\^ of June. i388. The emol- 

 u'uents of the position are 83,000 per annum and a dwell- 

 ing. Inquiries may ije addressed to Chas. S. Venable, 

 Chairman 0/ the Facility. 



HARVARD UNIVERSITY. 



Wa?iis. 



u;tioi will be given in the following AN EDUCATED AND CAPABLE PERSON 

 iC summer vacation of i.^88 : — ^ wanted in everj' town and city to canvass for sub- 



Tr;,* i^o^" T^fo™?";!?''"'"^^' ^''^'°''^' scriptions to Sc,e>,ce.- liberal compensation. Address. 



SHEB OF Science. 47 Lafayette 



subjects duriii 



Botany, Ch( 

 Physics, Physical Training, Topography 



For information apply to the Secretan^ of Harvard tiaming reterence: 

 Universiiy, Cambiidge, iViass. Place, New York 



ROSE POLYTECHNIC INSTITUTE, 



TERRE HAUTE, IND.-A SCHOOL OF ENGINEERIK'Q. 



"Well endowed, well equipped departments of Me- 

 chanical and Civil Kne:ineerin£r, Electricity, Chemis- 

 try and Drawinj;. ExtenaiveShopsand Laboratories. 

 For Catalogue, address T. C. MENDENHALL, Free. 



Schools. 



NTassachusetts. Boston, 752 Huntington Avenue. 

 ]y[ME. E. DECOMBES' FRENCH AND ENG 



li^h Home School for six girls, opens Septemberig, 

 18S8. Srooj per year. No extras. Highest References. 



Massachusetts, Plymouth. 

 jyjR. K.NAPP'S HOME SCHOOL FOR BOYS 

 (twenty first year). — Begins September 22, 1888. 



Massachusetts. Amherst. 



AMHERST COLLEGE, SU.MMER SCHOOL OF 

 Languages, Chemistry, Art, ^'athematics. Pho- 

 netics and Physical Training, 12th Session, July 2 to 

 ^iig 5. Lectures daily in French and German. For 

 progiamme address Prof. W. L. Montague. 



Investments. 



7^ FIRST MORTGAGES. 7^ 



Upon carefully selected farms in the most flourishing and 

 most rapidly growing parts of the West. 



6fo Guaranteed Uortgages 6% 

 6% Debenture Bonds 6^ 



Secured by similar m 'rcgages, and also by the capital of 

 the issuing Company, 



THt EASTERN BANKING COMPANY, 



43 MILK STREET, BOSTON. 

 Francis A. Oshorn, Pres. Edw. T. Merrihew, Trcas. 



New York, Peekskill. 



SUMMER SCHOOL FOR BOYS. — PEEKSKILL 

 Military Academy, Juneajth to September 5th, '88. 

 Send for circular. 



John N. Tilden. A.M., M.D., Peekskill, N.Y. 



New York, Roslyn, Long Island. 



THE BKYANT ?CHOOL. — A BOARDING 

 school of the highest class for boys. Primary, Inter- 

 mediate, and Academic Departments ; thorough Military 

 Organization and Discipline, with Systematic Physical 

 Training, School property representing an outlay of 

 over $250,000 ; one of the finest in the United States, in 

 proximity to country-seat of the late William Cullen 

 Bryant, 



SU.VIMER SCHOOL FOR BOYS. 



June 2T^t to September 1st 



The best located and most successful of the Summer 



Schools for Boys. School property beautifully situated 



on saltwater. Every facility for study and recreation. 



For catalogue of either session, apply to 



Geo Brcce CoRTELVof, Principal. 



AT MOQNT HOPE LADIES SEMINARY, 



Tarkvtown-on-the-Hudson, N. Y., 

 S300 pays board and tuitions per school year. Mu 

 and art only extras. Ee^t advantages with home ca 

 Opens Sept. 26r.h. 



ROBT. C. FLACK. A.M., Principal. 



TTNIVERSITY OF VIRGINIA SCIENTIFIC AND 

 ^ Engineering Schools. For catalogue, address, 



C. S. Venable, Chairman of Faculty, 



P.O., University of Va., Va. 



WM Scott's Emnlsion Has Done! 



Over 25 Pounds Gain in Ten Weeks. 

 Experience of a Prominent Citizen. 



The Caltfornia Societt for theI 



Suppression of Vice. [ 



San Francisco, July 7tb. 1886. ) 



I took a severe eold upon 

 my ehest and lungs and did 

 not give it proper attention ; 

 it developed into bronchitis, 

 and in the fall of the same 

 year I Avas threatened with 

 eonsumption. Physicians or- 

 dered me to a more congeni- 

 al climate, and I came to San 

 Francisco. Soon after my 

 arrival I commenced taking 

 Seott's Emulsion of Cod Liver 

 Oil with Hypophosphites reg- 

 ularly three times a day. In 

 ten weeks my avoirdupois 

 went from 155 to ISO pounds 

 and over ; the cough mean- 

 time ceased, c. R. bennett. 



SOLD BY ALL DRUGGISTS. 



