204 ANNUAL OF SCIENTIFIC DISCOVERY. 



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nitric acid. Milk treated with ozonized air, in a few days shows no casein, 

 while the fatty ingredients remain unchanged, and a good crop of sugar of 

 milk is obtained on evaporation. Fibrin is not tfctcd on by ozone. 



KEW FACTS RESPECTING OZONE. 



Oil of Bitter Almonds as an 0~onizcr. Schonbein, in his investigations on 

 ozonizing substances, has found in oil of bitter almonds an excellent medium 

 to induce the allotropic properties in atmospheric oxygen. In the following 

 we give a summary of the results arrived at in experimenting with this agent. 



Arsenic in the form of metallic stains, as obtained by the Marsh apparatus, 

 readily disappears under access of air and solar light, when some oil of 

 bitter almonds is poured upon it, generally within five to ten seconds, at the 

 common temperature. The liquid resulting is decidedly acid, and shows the 

 reactions of benzoic and arsenic acid. 



Antiinonial stains treated in the same manner do not disappear, which fact 

 may be adopted to distinguish them from those of metallic arsenic. 



Cadmium, in the form of thin sticks or lamina, on which oil of bitter 

 almonds has been poured and left in contact with, under direct sunlight and 

 access of air, is partly converted into benzoate of cadmia. 



Lead is oxidized to binoxide by the oil of almonds in direct sunlight, 

 though this binoxide be almost immediately reduced to a benzoate of the 

 oxide. 



Copper. A few drops of the oil of bitter almonds spread over a bright 

 piece of copper, in the direct light of the sun, causes a bluish-green color, 

 and the liquid soon solidifies into crystals of that color, which are a mixture 

 of benzoate of copper and benzoic acid. 



Silver, treated in the same manner as copper, will soon give a reaction with 

 sulphuretted hydrogen, and form a crystalline mass of benzoate of silver 

 and benzoic acid. 



Sulphide of Lead, in the state of a fresh precipitate, thinly spread on paper 

 and exposed to the direct action of light and air, is readily converted into 

 white sulphate by oil of bitter almonds. 



Sulphide of copper, in the same manner, into sulphate. 



Shaken with a solution of pure protosulphate of iron, oil of bitter almonds 

 produces a basic salt of the peroxide. 



The above experiments prove that the ordinary oxygen is ozonized by 

 this oil and light combined, in a similar manner as by phosphorus or by 

 electricity. 



On the preparation of Ozone ly Von Babo, and by Messrs. Bunsen and Magnus. 

 The apparatus in which ozone is obtained by the combustion of phospho- 

 rus, permits of separating the gas from the phosphorus acid with which it is 

 ordinarily mixed. This result is attained by causing the gas to pass through 

 a solution of chromic acid. This acid not only oxidizes the phosphorous 

 acid, but, as Baumcrt has shown, it increases the quantity of ozone; for, 

 after the washing, there is more ozone than before, evidently because the 

 oxidation of phosphorous acid is itself a cause of ozonization. 



Yon Babo has succeeded in drying ozone so far as to render it anhydrous, 

 whence it follows that ozone, or at least this kind of ozone, cannot be con- 

 founded with the hydrogcnated ozone HOs discovered by Baumcrt. Corre- 

 spondcnceof Sillimetn's Journal. 



Ozonomctry in the Crimea. During the Crimean war, the French army 



