BAUSCH & LOME'S 



MICROSCOPES. 



NEW 1012 



(See commendatory notice in "Nature," March 21, p. 

 Revised and Reduced Prices. 



MANY IMPROVEMENTS. 



Over 81,000 have been sold and are in use. 

 Tktr« art no hatter Instrument! matfa for Colleges ar Laboratories. 



THE NEW B.H. MODEL. 



(illustrated) is completely redesigned. Larger and heavier stand, 

 longer draw-tube, larger stage (will take full size Petri dish), im- 

 proved iris diaphragm, substage, with_ screw-out or new screw- and 

 swing-out fitting, fine adjustment giving slow or rapid movement, 

 very solid rack and pinion. From J&5 14-S. 6d. 



Complete Bacteriological Outfit, £13 9S« 6d. 



Also Microtomes, Centrifuges, Photomicrographic and 

 Projection Apparatus, Viscosimeters, Precision Labora- 

 tory Glass Ware, etc. 



THROUGH ALL DEALERS. 

 Inspection cordially Invited at our Showrooms, or Lists sent post tree. 



THE BAUSCH & LOMB OPTICAL CO., 



Contractors to British, Indian, Colonial, and Foreign Governments, 



19, THAVIES INN, HOLBORN CIRCUS, LONDON, E.C. 





A Monthly Record of Science in all its Branches. 



Each number consists of at least 40 large quarto pages of articles 

 and notes by authorities in their respective subjects.- 



PROFUSELY ILLUSTRATED. 



CONTENTS OF APRIL ISSUE: 



A Simple Recording: Device for Atmospheric Electricity.— Saxon Sun. 

 dials, Masons' Marks, and Consecration Crosses.— The Knowledge of 

 the Livine Napoleon during; the last Phase [1815-1821].— The Swedish 

 System or Educational and Medical Gymnastics.— The 8tudy of Primitive 

 Music- Cutting Down a Chimney like a Tree.- Solar Disturbances during: 

 February, 1912.— The Face of the 8ky for Ma-. * ?<2.— Notes (Astronomy ; Botany ; 

 Chemistry ; Geology ; Meteorology ; Ornitho l< 

 —Scientific Photography.— Reviews e 



With si illust. 



THROUGH ANY LLER. 



MONTHLY, ONE SHILLING not. Annual Subscription, 15/-, post free anywhere. 



'XV : Zoology).— Microscopy. 

 ■respondence. Etc. 



Offices: 42, BLOOMSBURY SQUARE, LONDON, W.C. 



( *vi ) 



