ADVERTISEMENTS. 



Estb'd XLUTOOVX 1765. 



C. BAKER 



SCIENTIFIC . . . 

 INSTRUMENT . . 

 MANUFACTURER, 



244, HIGH HOLBORN, LONDON. 



AGENT FOR 

 Leitz, Reichert, Zeiss, Jung, etc. Grubler's Stains and Reagents. 



Catalogues describing different pattern Micro- 

 scopes and accessories post free on application. 



C. BAKER'S new formula \ N.A. 75, with 

 over 1mm. working distance 1 1O O 



C. BAKER'S new formula ^ '' immersion 



N.A. 1.30, excellent definition and flat field 5 Q O 



List of SECOND-HAND INSTRUMENTS 



60 pages, published three times a year, post free. 



MICROSCOPIC SLIDES 



OF 



DIATOMACE^. 



Highest class mounts of selected Diatoms in large 

 variety from rare and interesting British and 

 Foreign materials, prepared with the best Styrax. 



NAMED SPECIMENS, TYPE SLIDES & CIRCLES. 



Specially prepared Slides for Photo-micrography. 

 Slides on approval. Lists free. 



SELECTED SPECIMENS OF 



FORAMINIFERA and POLYCYSTINA. 



WILLIAM A. FIRTH, 



348, Ravenhill Road, BELFAST. 



