ANOMALOUS PRODUOTION OP OZONE. 239 



«lso evident that the ore could not be exported, to be reduced else- 

 where, but the extraction of the copper must be carried on at the mine 

 itself. The necessary works could only be erected on the summit of 

 the cliff, as the exposed shore presents no site for this purpose, and 

 the intersecting ravine at Little Dark Harbour is apparently too con- 

 tracted for the erection of suitable buildings; but no difficulty need be 

 apprehended on this account. By the formation of slides on the cliff- 

 face, the ore could be run up by various known methods, abundant 

 water-power being available on the higher ground for that purpose. 

 Until further exploration be effected, however, the erection of reducing 

 works, or expenditure of capital in fitting the ground for permanent 

 mining occupation, cannot be legitimately recommended. 



ANOMALOUS PRODUCTION OF OZONE. 



BY HENRY H. CROFT, 



Professor of Chemistry, University College, Toronto. 



About six years ago, when evaporating some syrupy Iodic Acid, pre- 

 pared according to Millon's process, over sulphuric acid I noticed that 

 when the acid began to crystallise, the air in the jar (covering the 

 drying dish) had a strong smell of ozone, or active oxygen. A couple 

 of years afterwards, on again making iodic acid, this observation re- 

 curred to my mind, and I carefully tested the air in the jar during the 

 evaporation ; no trace of ozone could be detected until the acid began 

 to crystallise, when the smell of ozone became immediately perceptible, 

 and all the usual tests for that body^succeeded perfectly. 



During the last month I have had occasion to convert two ounces of 

 iodine into iodic acid, and exactly the same result has been observed. 



The acid usually solidifies to opaque verrucose masses; but on this 

 occasion, the crystals formed were clear and brilliant. The solution 

 had in this, as in all the former cases, been boiled down to thin syrup, 

 so that no trace of chlorine, or nitric acid, could possibly have remained 

 to act on the ozone paper. The air in the jar was tested from day to 

 day, both by the smell, and the action of iodised starch paper. Even 

 when a few crystals began to form no change was noticed, but when 

 the crystallisation set in fully the evolution of ozone was most remark- 



