Microscopes, Microscopic Objects, Hand Magnifying- Glasses, 

 Coddington Lenses, Insect Pins, Aneroid Barometers, Pocket 

 Thermometers, Field Glasses, Spy Glasses, Telescopes, Mathema- 

 tical Instruments, etc., etc. 



mm 









♦ 



924- CHESTNUT STREET, 



PHILADELPHIA, PA, 



Catalogues as follows sent on application 



Part 1st. Mathematical Instruments .... 160 pages. 

 Optical Instruments 144 



