CONCENTRIC REFLECTING CONDENSER 



A New Condenser for 

 Dark-ground Illumina- 

 tion, forming the high- 

 est achievement in the 

 construction of con- 

 densers for the obser- 

 vation of living and 

 unstained microscopi- 

 cal preparations. 



Mounted in substage 

 fitting, with centring 

 screws . . . . £2 



Mounted on plate to 

 rest upon stage of any 

 pattern microscope, 

 ] £2 



,s- SPECIALLY RECOMMENDED FOR UNSTAINED ^^^ 

 BOTANICAL SECTIONS. 



Descriptive Booklet post free on request. 



Microscopes and Accessories for all requirements, Micro= 

 tomes and Microtome Knives, Pliotomicrographic and 

 Projection Apparatus, Dissecting Stands, Aplanatic 

 Pocket Lenses, Prism Field and Opera Glasses, &c. 



E. LEITZ, 18 Bloomsbury Square, London, W.C. 



{A few doors from the British Museum,) 



If you wish to BUY or to SELL Books and 

 Periodicals bearing on or relating to 



NATURAL HISTORY 



in all its branches, write to 

 W. HEFFER & SONS LTD., CAMBRIDGE. 



Demy 8vo, 118 pp., Price 3s. 



A Supplement to TopograpMcal Botany, Ed. 2. 



^Y ARTHUR BENNETT, F.L.S. 



WEST, NEWMAN th CO., 54, Hatton Garden, London, E.C. 



