50 THE ROYAL SOCIETY OF CANADA 



The Scattering of Light by Dust-free Ligtiids-, II 



By W. H. Martin, M.A. 



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



The accuracy of the measurements of intensity and polarization 

 of the light scattered by various liquids has been increased by the 

 use of cross-shaped containers with sealed-in, flat, glass end-plates. 

 Measurements of light scattered by two-component liquid solutions 

 show that the relative intensity of the scattered light is always some- 

 what greater than that calculated on the assumption that the light 

 is an additive property for the two liquids. Liquids which polarize 

 the scattered light very far from completely show, on dilution, much 

 more nearly complete polarization. 



Measurements of the ratio of the intensity of incident light to 

 that of scattered light have been made for liquids. The results show 

 that liquids scatter from about one-tenth to one-fifth as much light 

 as do the same weights of the liquids in the gaseous state. 



Redetermination of the Melting-point of Sodium Chloride 



By Professor J. B. Ferguson 



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



In connection with the calibration of a platinum, platinum- 

 rhodium thermocouple the melting-points of zinc, antimony, silver- 

 copper eutectic, sodium chloride, silver, and copper were determined. 

 All were found in good agreement with the accepted values except 

 sodium chloride. Samples of the pure salt from various sources gave 

 melting and freezing points within a few microvolts of each other; a 

 White potentiometer with eliminating switch was used, the position 

 of the junction in the melt was varied, and all the usual precautions 

 were taken. There seems little room for doubt that the accepted 

 value 801°± 1° is at leaët one degree too low. 



