148 Anniversary Meeting. 



appear at the higher concentrations, but at low concentrations equiva- 

 lent solutions have equal conductivity. 



4. The conductivity of the haloid salts as a group is distinct from 

 that of the oxy-salts. 



5. The conductivity of the haloid salts of a metal among themselves 

 increases with the increasing atomic weight of the halogen. 



6. The conductivity of the oxy-salts of a metal is approximately 

 equal, and approaches that of the hydrates. 



7. The more easily oxidisable halogen salts are probably partly con- 

 verted into oxide in the flame, so that their conductivity is composed 

 of two parts. 



8. The behaviour of the salts in flames supplied with chloroform 

 vapour seems to establish the fact that the conductivity and the colour 

 produced by the salt vapour are not due to a common cause. 



The coloration of a flame by an alkali salt does not seem therefore 

 to be connected with the ionisation of the salt. It must be attributed 

 to the metal set free by a chemical process. This process consists 

 probably in a reduction effected by the flame gases. An oxy-salt 

 would, generally speaking, form in the first instance an oxide, which 

 would then be reduced. In the case of haloid salts it seems also 

 necessary to suppose that an oxide is intermediately formed, the metal 

 then being liberated by reduction. 



November 30, 1898. 



Anniversary Meeting. 



The LORD LISTER, F.R.C.S., D.C.L., President, in the Chair. 



A full Report of the Anniversary Meeting, with the President's 

 Address and Report of Council, will be found in the ' Year-book ' for 

 1898-9. 



The Account of the Appropriation of the Government Grant and 

 of the Trust Funds will also be found in the ' Year-book.' 



