D. CHEMISTRY AND METALLURGY 203 



tact with water, ozone is gradually transformed into ordinary- 

 oxygen ; the change being accompanied, as might be expect- 

 ed, by a corresponding expansion. By this expansion an- 

 other proof is given of the fact that ozone is formed by the 

 condensation of three volumes of oxygen to two. 33 G, Jan- 

 uary 19, 1874, 87. 



NEW MODE OF FORMING OZONE. 



Brodie, following up the line of his other recent investiga- 

 tions upon electrolytic action, has tested the effect of elec- 

 tricity upon carbonic acid gas. This gas, he finds, is partially 

 decomposed into carbonic oxide and free oxygen, part of 

 the latter assuming: the form of ozone. The best results were 

 obtained when a dry, rapid current of the gas was acted upon 

 in the induction tube by electricity of feeble tension and at a 

 low temperature. Under such circumstances, about three 

 fourths of the oxygen set free was transformed into ozone. 

 In one series of nine experiments, however, this limit was ex- 

 ceeded; from 76.6 to 85.5 per cent, of the oxygen eliminated 

 being converted into allotropic modification. It will at once 

 be seen that the electricity acts upon oxygen in the nascent 

 state in order to produce such an astonishing proportion of 

 ozone. 7 A, April, 1874, 309. 



OZONE AND ANTOZONE. 



We learn from the American Journal of Science that in a 

 recent volume by Bellucci, professor in the University of 

 Perugia, there is given a very interesting and valuable resume 

 of the researches that have thus far been made upon the sub- 

 ject of ozone, in which department the author has himself 

 done valuable work. With reference to the question of the 

 existence of antozone, the author decides, from a thorough 

 discussion of the subject, that the theories which were ex- 

 pressed by many, and which have assumed an allotropic con- 

 dition of oxygen antagonistic to ozone, are unsound, and that 

 the supposed antozone has, in fact, no existence. In this opin- 

 ion Bellucci anticipates the more recent researches of Engler 

 and Nasse, who have conclusively proved that the .reactions 

 attributed to antozone were really due in most cases to the 

 presence of hydrogen peroxide. A more recent publication 

 of Bellucci upon the subject of emission of ozone from plants 



