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days at the different altitudes and under different conditions 

 of weather, thus showing that there was no appreciable quantity 

 of hydrogen peroxide in the atmosphere. It was noticed on the 

 other hand that freshly fallen snow or hail gave a very marked 

 coloration with the reagent. It is hoped later to conduct tests 

 with glacier water, as this would be expected to retain the 

 hydrogen peroxide associated with the snow. 



In the estimations of ozone, made by means of potassium 

 iodide, it was found that in no case was any potassium iodate 

 formed. As pointed out above, this shows the absence of any 

 appreciable quantity of oxides of nitrogen. 



The results of the estimations of ozone are shown below 

 in tabular form : 



B. Measurements made with Free Balloons. — In order to obtain 

 some idea of the amount of ozone in the higher regions of the 

 atmosphere, use was made of the sounding balloons which 

 are used in meteorological investigations at the Manchester 

 University. These balloons, with the instruments attached, 

 rise to an average height of about ten miles, and then burst. 

 The deflated skin retards the rate of fall of the instruments to 

 the ground. In most cases these are returned by the finder. 

 A knowledge of the height attained and the temperature is 

 obtained by a recording baro- and thermograph. The reaction 

 vessel for the ozone tests was of the same form as shown in 

 fig. 2, and was suspended vertically from the balloon together 

 with the other instruments. 



A rough calculation of the amount of air which would pass 



