1873.] 



Presents. 



485 



eliminated in the induction-tube by the decomposition of the carbonic- 

 acid gas could readily be converted into ozone, but that it was difficult 

 to pass this limit. This amount corresponds with the formation of a gas 

 constituted of ozone and oxygen in the proportion of two units of ozone 

 to one unit of ox}^gen, the matter of the oxygen being thus distributed 

 2£ 3 -f £\ In several experiments, nevertheless, this limit was considerably 

 exceeded ; and a table is given of nine experiments, in which the amount 

 per cent, of ozone ranged from a minimum of 76*6 per cent, to a maximum 

 of 85*5 per cent. This latter amount corresponds with a gas constituted 

 of ozone and oxygen in the proportion of four units of ozone to one of 

 oxygen, thus' 4£ 3 + £ 2 . In this case the ratio of the total oxygen present 

 to the titre of the gas is 3-5 ; if the whole oxygen were converted into 

 ozone, the value of this ratio would be 3. 



These experiments, taken in connexion with those described in my 

 previous communication, leave no room for reasonable doubt as to the 

 composition of the unit of ozone, which is the triad form of the element 

 oxygen, and is to be symbolized as £ 3 , an hypothesis henceforth to be 

 regarded as conclusively demonstrated. This remarkable discovery has 

 many important bearings upon chemical theory, especially in relation to 

 the problem elsewhere raised by me of the true nature of the elemental 

 bodies and the constitution of the unit of the element chlorine, which 

 ozone so closely resembles in its chemical properties, and which is also 

 a triad element symbolized as ol^. 



Presents received May 29, 1873. 



Transactions. 



Berlin : — Kon. Preussische Akademie der Wissenschafteu. Monats- 

 bericht. Nov., Dec. 1872; Jan. 1873. 8vo. 1873. 



The Academy. 



Birmingham : — Institution of Mechanical Engineers. Proceedings. 



1872, 30, 31 July, Part 2 ; 31 October. 1873, 23 January. 8vo. 

 1872-73. The Institution. 



Buffalo : — Society of Natural Sciences. Bulletin. Vol. I. No. 1. 8vo. 



1873. The Society. 

 Christiania : — Kongelige Norske Frederiks Universitet. Aarsberetning 



for Aaret 1871. 8vo. 1872. On the Eise of Land in Skandinavia, 

 by S. A. Sexe. 4to. 1872. On some remarkable forms of Animal 

 Life from the Great Deep off the Norwegian Coast, by Gr. 0. Sars. 

 4to. 1872. Carcinologiske Bidrag til Norges Fauna, by Gr. O. Sars. 

 Andet Hefte. 4to. 1872. (2 copies.) Die Pflanzenwelt Nor- 

 wegens, ein Beitrag zur Natur- und Culturgeschichte Nord- 

 Europas von F. C. Schiibeler. 4to. 1873. Forekomster af Kise i 

 Visse Skifere i Norge, af A. Hellaud. 4to. 1873. De Skandi- 



TOL. XXI. 2 P 



