41 2 Messrs. L. Hill and M. Flack. [July 6, 



Table III. 



Eat. 





Air. 



Air. 



Air. 



Ozone. 



1st. 

 After 

 £ hour. 



2nd. 

 After 

 i hour. 



3rd. 

 After 

 i hour. 



4th. 

 After 

 | hour. 



A 



Loss of weight 



102 



103 



— 





88 



74 



— 



— 





2g 









7° 











B 



Loss of weight 



119 



130 



— 



70 



8 7 



144 



200 



— 





C0 2 given off 



















A 



Loss of weight 



113 



122 





63 



57 



65 



75 



— 





2g 



















C 





168 



155 



_ 



190 



235 



191 



122 



145 























D 



Loss of weight 



107 



104 



103 



136 



80 



97 



128 



95 





C0 2 given off 



142 



130 



129 



155 



127 



130 



132 



128 



E 



Loss of weight 



225 



230 



215 



145 



185 



123 



202 



- 





C0 2 given off 



132 





114 



91 



97 



77 



101 





F 



Loss of weight 



145 



270 



225 



235 



215 



235 



165 







C0 2 given off 



163 



177 



162 



165 



145 



137 



102 





a 





115 



195 



197 



148 



177 



145 



109 



149* 



















255 





CO., given off 



153 



188 



200 



163 



205 



173 



175 



110* 



















138 



* Here the upper number represents the result of a further £ hour of ozone, and the lower 

 numbers that of the succeeding jjj hour in air. 



the influence of ozone, we selected the method devised recently by 

 Dr. Gordon Douglas,* of Oxford, owing to its simplicity and efficiency. 



The subject was provided with a mouthpiece, fitted with inspiratory and 

 expiratory yalves. (We used the excellent mica valves made by Messrs. 

 Siebe, Gorman, and Co., and used in their mine rescue apparatus.) While 

 inspiring atmospheric air, the subject expired into a large canvas-rubber bag 

 of suitable construction, and previously emptied of air. After a period of 

 10 minutes a fresh bag was substituted, and the volume of expired air in the 

 first bag was measured by pressing the contents of the bag through the 

 meter, and a sample of the expired air was collected and analysed. Successive 

 samples were thus taken, some when the air was ozonised, and some when it 

 was not. The composition of the atmospheric air being known, the requisite 

 data were calculated from the measurements of the meter and the analysis of 

 the samples, all results being reduced to 0° C. and 760 mm. 



In all we have made 19 experiments, and append the details of the last 

 seven. In the preliminary trials of the method we found considerable 

 * C. G. Douglas, ' Journ. Physiol.,' 1911, vol. 42 ; 'Proceedings,' p. xvii. 



