[MILLER] CHEMICAL LABORATORY RESEARCHES 275 



positive terminal, and immersed in an aqueous solution containing 

 about 18 grams of sodium hydroxide per litre, a current of about 

 4 amperes per square decimetre, at 45 volts being passed for 12 

 minutes. 



These experments were carried out under the direction of 

 Professor J. T. Burt-Gerrans. 



The Determination of PlwspJwrus in Phosphor Bronze, and a Note on 

 the Determination of small amounts of Zinc 



By Miss F. M. Burwash 



Presented by Professor W. Lash Milllr, F.R.S.C. 



A comparative study of the methods for determining phosphorus 

 in bronze led to the conclusion that the short method of Greenwood 

 gives just as accurate results as the much longer and more tedious 

 procedure of Grifiith and Heath. 



To the bronze is added a gram of mild steel whose phosphorus 

 content is known. The whole is dissolved in aqua regia, nearly 

 neutralized, and the analysis finished exactly as in the case of high 

 phosphorus steels, except that the excess of potassium permanganate 

 is reduced with hydrochloric acid. 



Attempts to separate sm.all quantities of zinc from low grade 

 ores and slags, by precipitation as ferrocyanide, were unsuccessful 

 on account of the difficulty of purifying the precipitate without 

 formation of colloidal solutions. 



These experiments were carried out under the direction of Pro- 

 fessor L. J. Rogers. 



Light Scattering by Dust-free Liquids 



By W. K. Martin, M.A. 



Presented by Professor F. B. Kenrick, F.R.S.C. 



The ratio of exciting to scattered light has been measured for 

 the mercury blue, mercury green and sodium yellow lines. A com- 

 parison of these ratios shows that the intensity of the scattered 

 light varies inversely as the fourth power of the wave length. 



