A WEEKLY ILLUSTRATED |()URNAL QF SCIENCE 



" To the solid ground 

 Of Nature trusts the mind which builds for aye."— WORDSWORTH 



MACMIXLAN & CO., Publishers, 22 Bond St., NEW YOBK. 



Vol. 2i i 

 No. 3 I 



! Price i ^ Cents 



;lal Subscription $6 





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



Part ist — Mathematical Instruments, i6< tains list and prices of Drawing Implements. Drawing Materials, 



Pocket Com rnpasses, Engineers' Transits and Levels, Surveying Chains, Tape Meas- 



' "kit Rules, and Hooks relating to Drawing. Engineering, and Mechanics. 

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

 ' >pera and Field Glasses, Graphoscopes, Stereoscopes, Camera-Obscuras, Camera-Lucidas, 

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

 Part 3d — Magic Lanterns and Slides, 112 pages : contains list and prices of Magic Lanterns for Toys, for Public and 

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

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

 Part 4th — Physical Instruments, 1S8 pages ; contains list and prices of Instruments to illustrate Lectures in every 

 department 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, Philadelp?iia. 



