'OL. 



No. 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



"To the solid ground 

 Of .Valure trusts the mind which builds for 



MACMILLAN & CO., Publishers, 



."—Wordsworth 

 Bond St., NEW YORK. 



THURSDAY. JANUARY 15, 1S80. j 



Price 15 Cents 

 Annual Subscription $6 





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Our Priced and Illustrated Catalogue will be published in four parts, any or all of which will be mailed on application. 

 »rt 1 si— Mathematical Instruments, 160 pages ; contains list and prices of Drawing Implements, Drawing Materials, 

 Pocket Compasses. Surveying Compasses, Engineers' Transits and Levels, Surveying Chains, Tape Meas- 

 'ockel Rules, and Hooks relating to Drawing, Engineering, and Mechanics, 

 irt 2d— Optical Instruments, 144 pages; contains list and prices of Spectacles, Eye-glasses, Lenses, Spyglasses, 

 Opera and Field Glasses, Graphoscopes, Stereoscopes, Camera-Obscuras, Camera-Lucidas, 

 Microscopes, Microscopic Preparations, and Books on Optics and Microscopy. 

 »rt 3d— Magic Lanterns and Slides, ir2 pages ; contains list and prices of Magic Lanterns for Toys, for Public and 

 ite Exhibitions, Sciopticons, Stereopticons, Scientific Lanterns, and accessory apparatus to be used 

 with them ; Magic Lantern Slides, both colored and uncolored. 

 art 4th— Physical Instruments, 188 pages; contains list and prices of Instruments to illustrate Lectures in every 

 trtment of Physics and Chemical Science, Air Pumps, Electric Machines, Galvanic Batteries, Barome- 

 ters, Thermometers, Rain Gauges, Globes, Spectroscopes, Auzoux's Anatomical Models, and Books relat- 

 ing to Scientific Subjects. 



JAMES W. QUEEN & CO., 



Mathematical, Optical, and Philosophical Instrument Makers, 

 924 Chestnut Street, Ptviladelphia. 



