On Ozone. 



169 



facts are very familiar to Geologists; yet they merit, especially 

 with regard to the older formations, more attention in some res- 



Fig. 6. — Chazy Limestone, Island of Montreal, (10 diams.) 

 pects than they have hitherto received. Microscopic examina- 

 tions of organic limestones may serve to show the precise species 

 which have most contributed to their accumulation, and the 

 conditions under which their remains were spread abroad, and 

 cemented into stone. They might also serve to identify lime- 

 stones not containing entire organic remains, by showing the 

 species out of whose fragments they had been formed. To do 

 anything really valuable toward these objects, would require the 

 patient preparation and examination of a great number of speci- 

 mens; but, to any one who has leisure for the task, it might form 

 a very interesting field of study. 



ARTICLE XII.— On Ozone. By Charles Smallwood, M.D., 

 LL.D., Professor of Meteorology in the University of 

 McGill College, Montreal. 



(Presented to the Natural History Society.) 



The investigations on the nature and properties of Ozone, have 

 within the few past years engaged the attention, and become the 

 subject of enquiry, alike of the chemist, the meteorologist and the 

 physician. The chemist has found its manifestations and properties 

 approximate to, if not identical with Oxygen in a peculiar state of 

 existence or development. The meteorologist (especially of the 

 European continent) has proclaimed it to be the instrument, or 

 medium, that Providence has secured to provide for the pro- 

 duction of the grand phenomena of nature ; that its action can 

 explain the formation of all meteors, as well as the fluctuation and 

 diurnal changes in the pressure of the atmosphere indicated by 

 the oscillations of the Barometer, and that it is the true cause and 



