iv 



SCI ENCE.— ADVERTISEMENTS. 



NOTABLE IMPROVEMENTS 



in 



PROJECTION APPARATUS 



The New Keflectine Lantern attachable to any Projec- 

 tion Lantern or Stereopticon, for showing upon the screen 

 prints, photos, engravings, sketches, diagrams, tlo\A'ers, 

 Entomological and Anatomical Specimens, etc., all in 

 natural colors. Cuts in books may be shown without in- 

 jury to the hook. 



The New Projectlnt; Microscope attachable to any Pro- 

 jection Lantern or Stereopticon. Projection eye piece. Jle- 

 diascopefor showing large microspecimensand cooling cell. 



The New Projection Spectroscopes and Polarlseopes 

 attachable to any Proiection Lantern. 



Lantern Glides to illustrate Educational and Scientific 

 Subjects. We rent slides at low rates. Send for lists, 

 naming particular subject of interest. 



WILLIAMS, BllOWN & EARLE, 

 Manufacturers of Slereopticiuii;, ^ficrosl■op<^s, etc. 

 Department M, 918 Chestnut St., Philadelphia 



MARINE BIOLOGICAL LABORATORY 



Supply Department— 1. Zoology — Preserved Material 



of all types of animals for class work or for the museum. 

 8. Botany — Preserved Material of Algae, Fungi, Liver- 

 worts and Mosses. For price lists ind all information ad- 

 dress GEO. M. GRAY, Curator Woods HoU, Mass. 



WANTED— Taxidermists, at the Field Co- 

 lumbian Museum, Chicago. Applicants 

 should give full particulars. Apply to the 

 Director. 



Dr. HOWARD ADY, M A , Ph.D., F.R.P.S.E., M.M.S., 

 Etc., presents his compliments to Scientific men in U.S.A., 

 and says that he will supply specimens of British rocks and 

 rock-sections for microscope, with or without full petro- 

 prraphical notes at eighteen pence each (English money) post 

 free. E.vchangcs of British for American ilinerah and Rocks En- 

 couraged. Lessons by Ceirrespondence in Lithology a Specialty. 



11 Aspenlea Road, Hammersmith, London, W., England. 



Getting Acquainted witli tlie Trees 



By J. HORACE McFARLAND. 



Illustrated, Cloth, $1.50 net (postage ISe.) 



"Both delightful and companionable." 



— Times and Despatch. 



THE MACMILLAN COMPANY, Publishers 



The Care of a House 



A VOLUME OF SUGGESTIONS 



To householders, housekeepers, landlonls, 

 tenants, trustees, and others, for the econoiu- 

 ical and eflicient care of dwelling houses. 



By T. M. CLARK 



F'llnir of the American Institute of Arcliitects : Aiiilior 

 of •' Areliitecl, Owner and Builder Vnder llie Jmu\" 



Cloth, ISmo, p. 60 net (postage 14c.). 



" Indispensalile to the householders." 



— Chicago Inter- Ocean. 



THE MACMILLAN COMPANY, Publishers. 



American Education 



A Magazine of Quality 



FOR TEACHERS OF ALL GRADES 

 Principals and Superintendents 



Annual Subscription $1.00 Single Copies 10 Cents 

 3 Years for $2.00 



A FEW FEATURES 

 Articles by Foremost Educators on Prac- 

 tical School Subjects 

 Excerpts of the Best to be Found in Cur- 

 rent Educational Journals 

 Practical Methods and Suggestions for 

 the School-room 

 Summary of the important educational news 



4 MONTHS TRIAL OFFER 25c. 



Send this coupon with 2.5 cents and your name will 

 be entered for a trial subscription of four months. 



Address : 



AMERICAN EDUCATION 



81 Chapel Street, Albany, New Ycrk 



Name 



Post Office .. 

 State. 



WM. GAERTNER & CO. 



Astronomical and 

 Physical Apparatus 

 5347 and 5349 LAKE AVE., :: :: CHICAGO 



SPECIALTIES 

 Standard Apparatus of New and Improved Designs 

 Reading Microscopes and Telescopes 

 Astronomical Telescopes Dividing Engines 



Spectroscopes Comparators 

 MIclielson Interferometers General Laboratory Apparatus 



Bolometers Heliostats Univrrsal Laboratory Supports 



NEW LABORATORY AND STUDENT'S BALANCE 

 Large Capacity High Accuracy 



Greatest Convenience Low Cost 



