272 Sir James Deivar [Jan. :^(», 



The resistance of the cotton-wool phigs was estimated by cooling 

 the second U-tube in liquid air. In five minutes a deposit 15 to 

 20 mm. in length was formed. 



The two U-tubes being thus at —120° and —185° C. respectively, 

 the discharge was started in the ozoniser. At first no coloured deposit 

 could be seen in the U -tube in liquid air, but later the deposit became 

 coloured, and in 20 minutes a distinct brown ring was observed at a 

 point 3 mm. above the liquid air surface. 



Where the gases entered the first limb of the U-tube at —120" C. 

 a white crystalline deposit was observed ; this did not melt until the 

 temperature had risen almost to 0° C, when it distilled back into the 

 bulb containing carbon disulphide. 



This indicates that the ozoniser product contains two substances, 

 and shows that the substance which gives rise to the brown solid is 

 not condensed by cooling to — 120° C, but passes on and is slowly 

 transformed into the brown solid in the U-tube at —185° C. 



Action of Coconut Chaecoal and Rubber. 



The vapours were passed over coconut charcoal at —185° C, and 

 the results showed that the ozoniser product is thereby absorbed, 

 destroyed, or caused to polymerize. The same result was obtained 

 when the charcoal was cooled to —78° C. or heated to 250° C. 



The vapours were also passed over finely shredded rubber in order 

 to absorb some of the carbon disulphide. The brown solid was 

 formed as usual, but the amount of carbon disulphide deposited with 

 it was distinctly less. It therefore appears that a partial separation 

 of the transforming ozoniser product from the disulphide has been 

 effected. 



A complete separation of the two substances seems to be for the 

 present out of the question on account of the rapidity with which the 

 ozoniser product polymerizes in the solid state at low temperatures. 



Analysis of the Solid Peoduct. 



A sufficient quantity of the brown soHd was collected (0-1127 

 grm.) to allow of the estimation of sulphur in it, 



which gave S = 71 ' 8 per cent., 



CS requires S = 72 • 7 per cent. 



Further, the ratio C : S was determined in another specimen 

 collected from a number of experiments in which the condenser had 

 been cracked and shattered. This specimen was probably contami- 



