284 



Scientific Proceedings, .Royal Dublin Society. 



passing in the tube, giving only a sliglit green luminescence. Afterwards 

 there remained a beautiful red coloration on the quartz tube, wliere the 

 copper had probably entered into combination with the silica. 



Whilst taking the second photograph there was a green fluorescence on 

 the capillary portion of the tube for about 30 seconds at first. After some 

 time a greenish blue colour appeared on the lower limb for a short time. 

 This green fluorescence appeared again when taking the third photograph. 



The few lines which are seen on Plate XXIV., No. I, show the slight 

 volatility of copper chloride, The second photograph gives only the ultimate 

 lines of copper, X 3274-1 and A 3247'6, both of which appear faintly on 

 No. III. 



