NA1URE February 27, igig 



Laboratory Glassware 



BEAKERS, FLASKS, 

 RETORTS, &c. 



Porcelain 



CRUCIBLES AND BASINS. 



Filter Papers 

 Pure Chemicals 



JOHN J. GRIFFIN & SONS, 



LTD.. 



KINGSWAY, LONDON, W.C. 2. 



Novw Ready. 



THE 



DRIFT TO REVOLUTION 



The Spirit of the Industrial Era. The 

 Romance of Machine Production. Enter, 

 the Liberals and Radicals. The Money- 

 spinners and their Deity. The Prophet of 

 Socialism. The Imperialists and their 

 Kultur. The People : Their Housing and 

 Education. That Great Leviathan. The 

 Duel of Anarchist and Financier. War, 

 Revolution — or Eutopia. 



Price 1 -. Post Free, 1/1. 



Forming No. IX. of Papers for the Present. 



Published for the Cities Committee of the Sociological Society hy 



HEADLEY BROS., Publishers, Ltd., 

 72 OXFORD STREET, W. 1. 



Advantages of the 



BELLINGHAM & STANLEY 



IMMERSION REFRACTOMETER 



The accuracy of measurement with this instrument is j unit in the fourth decimal 

 place. 



The prism, if damaged or broken, may be replaced by the user without difficulty. 

 The prism for range of refractive indices 1'325 to 1*367 may be replaced by others giving 

 further ranges of refractive indices up to 1*55, covering, therefore, nearly all solvents. 



The instrument has the same scale value as the German type of instrument, and 

 existing tables may therefore be used. 



Delivery of a limited number in 3 weeks from order. 



. Suitable water baths for accurate temperature control are supplied. 



Full particulars of these instruments and of the British Abbe and Butter 

 Refractometers from the makers— 



BELLINGHAM & STANLEY, Ltd., 71 Hornsey Rise, LONDON, N.19. £38 



