CLIMATE SANITARY RELATIONS. 473 



I am led to believe that the amount attains two maxima and two 

 minima, in twenty-four hours corresponding to the barometric 

 oscillations, and also to the degrees of humidity. It has been largely 

 developed for some years during the potato rot, the weather being 

 moist, and with a hot sun, a state peculiarly fitted to show ozone 

 present. I do not find it at all connected in amount with the electri- 

 cal state of the atmosphere; sea breezes seem to favor its develop- 

 ment, such as a northeast wind. I have noted its presence, with a 

 thermometer, 36 below zero, and as high as 90 above. Tempera- 

 ture does not seem to influence the amount so much as the humidity 

 of the atmosphere." 



In the " Canadian Naturalist and Geologist" for Decem- 

 ber, 1859, he further remarks : 



" The psychrometer always indicates presence or absence of ozone; 

 it is never in dry air ; is decomposed by heat when formed by means 

 of phosphorus ; light has, in its development, not much influence 

 upon ozonized paper; polarized light has least influence; influenced by 

 luminous, heating, and actinic rays ; the influence of colored media 

 are proportioned, having a grade of power from orange, maximum, 

 to green, minimum ; east and south winds ozonic ; westerly and 

 northerly not ; rain and snow, large amount ; northeast land wind 

 not ozonic; sea breezes, with moisture, ozonic; dry northeast wind, 

 with high barometer, no ozone. Its effects on animals and man will 

 require a system of registration. 



"During cholera, amount diminished, but humidity was also di- 

 minished; it is highly deleterious to lower class of animals, its well- 

 known poisonous properties being turned to advantage, when pro- 

 duced by slow combustion of phosphorus. As a therapeutic agent, it 

 can scarcely be said to have been administered. Oil of turpentine, 

 exposed to light, has acquired a pungent taste like peppermint, owing 

 to formation of ozone, and proved poisonous to small animals. It 

 has been advised as a local application in rheumatism, and internally 

 in chronic discharges from mucous membranes of man. He (the 

 doctor) is prosecuting investigations of effects of vegetation on 

 amount of ozone; also effects from germination of plants. The con- 

 tinent of Europe is full of observers, but on the continent of North 

 America but little attention has been given to it. A constant, syste- 

 matic form of observation is necessary, and it is hoped soon to take 

 its proper place in the annals of true science, and become alike in- 

 teresting to the chemist,* physician, and meteorologist." 



* " The chemical composition of ozone is defined to be a compound of oxygen, anal- 

 ogous to the peroxide of hydrogen, or that it is oxygen in an allotropic state, that is, 



40* 



