354 HOW TO SEE WITH THE MICROSCOPE. 



l-2inch 65 2500 



1-4 inch, Adjustable 115 2400 



1-6 inch, " 175 Dry and immersion 34 00 



1-8 inch, " 175 " " 40 00 



1-15 inch, " 175 " " 5000 



STUDENTS' SERIES. 



Sinch 8 $600 



2inch 10 600 



linch 22 1000 



2-3inch 32 , 1200 



l-2inch 50 1500 



1-4 inch 100 16 00 



l-8inch 135 2500 



Wenham's Eeflex Illuminator 10 00 



(The Messrs. Spencer & Sons furnish a full line of goods desir- 

 able by the microscopist, such as solid eye pieces camera lucidas, 

 and accessories generally. Their former connection with the 

 Optical Company has been dissolved, and they now continue 

 business on their own account, as above stated, at Geneva, N. Y.) 



MICROSCOPES AND OBJECTIVES, BY R. B. TOLLES, 

 BOSTON, MASS. 



Tolles' Large Microscope, ' B," no objectives $225 00 



Student's stand, 1 inch E. P., 1, and l-4th inch object- 

 ives, packed in black walnut case 50 00 



Additions, etc., to the above- 

 Extra eye pieces, each 4 00 



Camera lucida 5 00 



Sub- stage, for accessory apparatus 5 00 



Sliding stage, giving horizontal and vertical movements 



by hand 15 00 



.Fine adjustment by lever and micrometer screw 20 00 



Rack a.nd pinion for coarse adj ustment 12 00 



Draw tube 4 00 



Plain mirror 3 00 



Thin glass stage to rotate on the optical axis 10 00 



Packing boxes for transportation, extra 1 00 



