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of Barium by the means of the monohydratc of SO3, exhibits-an ozonelike smell and the power of turning my ozone test-paper blue. Having at that time not yet a notion of twoopposite active conditions of Oxigen, I was inclined to ascribethose properties to the presence of minute quantities of Ozonein the said gas, but on examining it more closely, I found itto be neutral oxigen mixt up with a very small portion ofAntozone or ©. A most important and distinetive propertyof Antozone is the readiness, with which it unites with waterto form peroxide of hydrogen, whilst Ozone (alike neutraloxigen) is entirely incapable of doing so. Hence it comes,that the oxigen disengaged from BaO + © under certain pre-cautions, becomes inodorous on being shaken with water, andthat this fluid contains HO 2. The simple cause of the minutequantities of 0 obtained from BaO + © is the heat disengagedduring the action of SO 3 upon the peroxide by which mostof the © eliminated is transformed into Q.

Now, what do you say to the extraordinary fact, thatthe antipode of ozone has these many thousand years beenready formed and incarcerated, only waiting for somebody torecognize and let it loosc out of its prison. A darkblue speciesof Fluorspar has for years been known by the german Minera-logists, being distinguished by its property of producing apeculiarly disagreeable smell on being triturated. Many con-jeetures were put up as to the chemical nature of the odorousmatter emitted from the spar: Chlorine, Jodine and even Ozonewere spoken of, but it turned out to be a different thing.Mr. Schafhaeutl' of Munic sent me a month ago some hundredgramms of the said Fluor-spar (oecurring within the veins ofa granitic rock at Wcelsendorf a bavarian village near Amberg),asking me to try my luck in ascertaining the nature of thesmelling matter, and I think I have fully sueeeeded in making

1 Karl Emil Schafhfeutl Ph. D. M. D. professor of Geology and Palae-ontology at Munich, where he died in 1890. He was born in 1803 at Ingolstadt.