1911] on Chsmical Change at Low Temperatures. 273 



nated with minute* fragments of glass and also contained moisture. 

 The material gave on analysis : — 



S = 61-0 per cent., C = 24-6 per cent., and ratio C : S = 1 : 0*854, 



or, allowing for the 5 per cent, of water present as impurity, 



C:S = 1 :0-93. 



The substance produced in the manner described has the com- 

 position of carbon monosulphide, and it seems justifiable to conclude 

 that, under the influence of the silent electric discharge, carbon di- 

 sulphide has, like carbon dioxide under similar conditions, been 

 dissociated, in this case into sulphur and gaseous carbon mono- 

 sulphide, and that the latter can polymerize with the evolution of a 

 considerable amount of energy to form a brown solid even at the 

 temperature of liquid air. It is the remarkable instability of the 

 solid or liquid gas at low temperatures that is so characteristic and 

 renders the physical and chemical examination so difficult. 



Chemical Reactions of the Ozoniser Product. 



The action of a number of substances on the ozoniser product was 

 studied by placing the substances to be examined, either mixed with 

 or deposited on asbestos in a U-tube, and allowing the vapours to 

 pass over them. 



In this way it was found that the passage of the ozonizer product 

 was prevented by finely divided platinum, nickel, or silver. 



Ferric oxide (not ignited), yellow mercuric oxide, and silver oxide 

 were found to react with the ozoniser product to form sulphides of 

 the metals ; ferric oxide is much more efficient than the other two. 



SoHd caustic potash, silver nitrate, lead acetate, and sodium 

 peroxide seemed to have little or no action on the ozoniser product, 

 while barium peroxide reacted with it, forming barium sulphide. 



The most striking reaction observed is that which takes place 

 with concentrated sulphuric acid. After some experiments had 

 shown that, as used, the vapour of carbon disulphide was not attacked 

 by sulphuric acid, the ozoniser product was allowed to pass over the 

 surface of sulphuric acid placed in a wide U-tube. The sulphuric 

 acid rapidly acquired a yellow colour, changing gradually into deep 

 orange-red, then became turbid, and deposited a yellow solid ; brisk 

 effervescence occurred during the whole time, and even after several 

 hours none of the ozoniser product escaped the action of the acid. 

 The yellow sohd which separated from the sulphuric acid was found 

 to be sulphur. 



The properties of the brown solid produced from carbon disul- 

 phide, which has the composition of carbon monosulphide, have been 



YoL. XX. (No. 105.) T 



