CUNI.I rnvrrv AND LUMDIOSm <>r KI.AMI> 



C VAI-H;IM.I. SALTS. :n 



obtaining constant conditions during the e\|-i -imcnts. In other reHj>ects it was 

 proposed to use arrangeinents siiniliir t.- those of A 1:1:111. MI s. 



Pi-eliininary experiments with the apparatus showed ;it once that numerous pre- 

 cautions were necessary to secure constant results, and it wax only utter manv months 

 of trial and the accumulation and rejection of series of measurements that the 

 apparatus was finally brought into a reliable working condition. 



The experiments have been confined to salts of the alkali mutuls. The relati\e 

 conductivities of flames into which the salts were projected were determined and the 

 experiments were designed to show : 



I. The relation between conductivity and electromotive force. 

 II. The relation Ixstween the conductivity and the amount of salt present. 



III. The relation between the conductivities of equivalent ({uantities of various 



salts of the same metal. 



IV. The comparative conductivity of equivalent quantities of the salts of 



different metals. 

 V. The behaviour of the same salts in different flames. 



From these results, conclusions are drawn respecting the primary object of tin- 

 investigation, which was to discover whether the coloration of ilames, and their 

 electrical conductivity when containing vaporised salts, are due to a common cause. 



Description of Apparatus and Method of Working. 



The apparatus employed in this investigation consisted essentially of an arrange- 

 ment for producing a Bunsen flame with separated cones, into which salt solutions 

 could be introduced as a fine spray along with the mixed coal-gas and air. A 



also for an electromotive force of '2 Duniell, is given. The following are extnicU from the two sets of 

 readings : 



The fact that the readings are not identical is not important, as AKKIIKMI s expressly states that his 

 electrodes suffered change in course of the investigation ; Imt it will l>c olwerved that the <litrercnces are 

 i|iiitc capricious. Thus the second reading for sodium chloride is 60 per cent, greater than the first, whilst 

 for rubidium chloride the second reading is 25 per cent, less than the first. We are unable to conjectuiu 

 any satisfactory explanation of these discrepancies. 



N 2 



