OZONE, ARSENIURETTED HYDROGEN. 85 



ends, holding about 400 c.c., 60 cms. long and 3 cms. wide, 

 placed in longitudinal vibration by the friction of a horizontal 

 wheel provided with a moist piece of felt. This very simple 

 appliance, which Koenig has arranged, produced, during experi- 

 ments on ozone, 7200 simple vibrations per second, according 

 to observations taken by this expert (Fig. 8). 



The sharpness of this note is almost intolerable. 



The following are the results observed with ozone, arseniu- 

 retted hydrogen, and sulphuric acid in the presence of ethylene, 

 oxygenated water, and persulphuric acid. 



3. Ozone. The oxygen used contained such proportions of 

 ozone as 58 mgrms. per litre, a degree easily obtainable with the 

 author's appliances. With the tuning fork (100 vibrations), a 

 state of vibration having been maintained for an hour and a 

 half, the amount of ozone in the gas remained constant, both 

 with dry ozone and with ozone mixed with 10 c.c. of water. 

 This latter did not either lower the degree of the ozone or 

 supply oxygenated water. 1 



With the tube and wheel (7200 vibrations), the state of vibra- 

 tion being maintained for half an hour, the degree of dry gas 

 did not vary. The absorption of the ozone was determined 

 subsequently by standard solution of arsenious acid : the dimi- 

 nution in the strength of the latter was found equivalent to 

 171 div. of permanganate ; while this diminution was precisely 

 171 in an equal volume of the same gas analysed previous to 

 the test. 



Now, ozone is a gas which is transformed into ordinary 

 oxygen with liberation of heat ( 14,800 cal. for Oz. = 

 24 grms.), and it became transformed spontaneously in a slow 

 and continuous manner, passing from 53 mgrms. to 29 mgrms. 

 in 24 hours, when it was left to itself in the conditions above 

 given. Nevertheless, it may be seen that its transformation 

 was not accelerated by a movement which caused it to vibrate 

 7200 times per second for half an hour. Its spontaneous 

 decomposition could not therefore be attributed to these 

 sonorous vibrations which constantly traverse all bodies in 

 nature. 



Such an absence of reaction is not, on the other hand, 

 explicable by an inverse influence, for a similar tube filled with 

 pure oxygen did not modify the strength of the arsenious 

 solution after similar vibration and for a similar space of time. 



4. Arseniuretted Hydrogen. A similar vibratory movement 

 communicated to a tube filled with this gas, and afterwards 

 sealed, did not modify it; nevertheless, in the space of 24 

 hours, the tube began to be covered with a coating of metallic 



1 In these experiments it will be well to guard against the alkalinity of 

 glass, which will rapidly destroy the ozone. When using pulverised glass 

 one is specially exposed to this accident. 



