Prof. Schoenbein m some Properties qj Ozone. 197 

 ni^ in tti« life of Mr. ^^art inj ^UMy^^^,^ 



Y*(W^ave cppieci the preceding statement as that of Mr, 

 WaVtjS n'iends, but a regard for the reputation of Mr. Caven- 

 ciisfi^ independent of higher motives, compels us to acknow- 

 ledge that the statement is partial, and the argument not well- 

 founded. We are not able, at present, to refer to the original 

 documents, but we had occasion, some years ago, along with 

 a distinguished chemist (Dr. Hope), to examine them with 

 (Tiinute attention; and it was then our decided convictioii.^ 

 that the merit of the discovery of the composition of water be^ 

 longed to Mr. Cavendish." — Edin. Encycl., vol. xviii. p. 78^. ,, 

 'These observations will, I trust, convince every candid 

 rfeader that the reviewer's charges against me are utterly 

 groundless. Although Mr. Watt was my countryman, and, 

 my personal friend and correspondent; although I cherished 

 for him the warmest affection, and admired him as one of the 

 greatest and best men of his age, I have at three different 

 times of my life come to the decision that he was not, and 

 that Cavendish was the discoverer of the composition of water. 

 Had I been disposed to sacrifice truth, under the influence of 

 national and personal feelings, I might have found a safe 

 shelter behind the broad shield of M. Arago and Lor^: 

 Brougham's authority, and would thus have avoided the an-^ 

 noyance of rebutting the calumnies of the British Quarterly 

 reviewer. 

 « t • jT-ii f I am, my dear ibir, ^j^ -.nr..*«» 



r // i ' ^^^ ™°^^ faithfully yoursj ,gg 



St. Leonard's College, St. Andrews, D. BrewSTER. V^ 



'^•--U' Augusts, 1845. , // 



. ■ . I .J.. . :>' . .r.fl! - ^. .. !{ • 



XXX. Observations on 0::one as compared to Chlorine, oil 



By Professor Sch(ENBEin of Basle. su 



'To tJie Editors of the Philosophical Magazine and JeurtiaV?^ 

 Gentleme*' '*-'»i 'i^'3'{ ydi III .iJu// .iM to anoijnsvnl 



MANY properties,' aftcT '{he' most" es'seiCfaroriel Delonging^ 

 to ozone, are so similar to those possessed by chlorine, 

 that I was led to suspect ozone to be a simple halogenous body 

 like chlorine*. My more recent researches having rendered it 

 highly probable, if not altogether certain, that ozone is a pe^' 

 culiar compound of hydrogen and oxygen, 1 can no longer 

 maintain my former view, and we must place ozone far away 

 from chlorine, in case we regard, according to the established 



* The nature and properties of ozone have been described in vol. xvii. 

 p. 293, vol. XX. p. 64, and vol. xxiv. p. ^QQ of the present series. — Eu. 



