Thomas & Richard Willats. 65 



- . s. d. 

 Large Sections of Recent Woods, Specimens of Sea Weed, 



Botanical Objects, Wings of Insects, etc. mounted in 

 Canada balsam, for the solar or Oxyhydrogen Micro- 

 scopes. 

 Microscope Object Slides, plain glass, with polished edges, 



per doz. 2 



Ditto, with polished oval cells 4d each, or per doz 036 



Ditto ditto ditto rounds 4d each or per doz. 036 



Ditto ditto, roughs, rounds or ovals 3^d or 030 



Cut Rings from per doz. 2s 6d to 050 



Ditto ditto, Squares from per doz. 6s to 10 



Thin Glass, for mounting specimens, cut to sizes, from per doz. 5 



Ditto ditto in pieces at per oz. 



Pure Canada Balsam per bottle, 6d and 010 



ancRoscopxc DISSECTING INSTRUMENTS. 



NEW ^ CHOICE OBJECTS NEATLY MOUNTED. 



OPTICAL INSTRUMENTS. 



SPECTACLES in every variety of shape and Material, with Best Brazil 

 Pebbles or Glasses. 



OPERA, READING, AND EYE GLASSES. 

 Military, Naval, and Astronomical Telescopes. 



Oxy-Hydrogen Microscopes, Polariscopes, 



CAMERA XiUCXDAS, POLARIZING APPARATUS. 



