1911.] 



411 



Table II. 







Air. 



Air. 



Air. 



Ozone. 



1st 

 \ ft it 



2nd 

 After. 



3rd 

 After 



4th 

 After. 



Eemarks. 



Mouse 



Time, in mins. 



15 



15 



15 



105 



15 



15 



15 



15 



Ozone li parts per 





Loss of weight 



1 







185 







fj 





million. ^ Breath- 





H 2 given off 



' ~'l 



]•„'< 



















co 2 













33 



30 



53 



1 rd °° j ° ea 

 or ere . 



Mouse 



Time, in mins. 



20 



20 



— 



120 



20 



20 



20 



20 



Ozone 6 parts per 





Loss of weight 



38 3 







499 



98 









million. Breath- 





H 2 given off 



151 













QA 



ss 



ed m ^ e< ^^ 





co 2 











<in 



215 



22 



24 



or ere . 



Mouse 



Time, in mins. 



20 



20 



20 



90 



20 



20 



— 



~ 



Ozone 1| parts pel- 





Loss of weight 



210 



! 



210 



198 











million. 





HoO given off 























co 2 „ 



121 



146 



146 





30 



50 









Mouse 



Time, in mins. 



75 



— 



— 



75 



75 



— 



— 



— 



Ozone less than 





Loss of weight 



■[■' 







335 











1 part per million. 





H 2 given off 









3 80 











o o *"g lleS ^ r ° m 





2 » 



163 









97 















60 







60 



60 



60 



60 





Ozone well less 





Loss of weight 



580 







515 



325 



325 



380 





than 1 part per 





H 2 given off 









525 



337 



335 



393 





million. 1 foot 





C0 2 



207 







64 



150 



112 



208 





from ozoniser. 



Mouse 



Time, in mins. 



75 







75 



75 



60 







Ozone well less 





Loss of weight 



405 







250 



185 



236 







than 1 part per 





H 2 given off 



320 







233 



189 



135 







million. 100 cm. 1 - 





co 2 



164 







123 



144 



115 









in a room, the ozoniser being placed at distances varying from 100 to 350 cm. 

 from the inlet of the ventilation current which was drawn through the animal 

 chamber. Table III gives the loss of weight and amount of C0 2 given off in 

 milligrammes in the last eight experiments made under these conditions, the 

 reading for the oxygen as before being variable. In all, 16 similar experiments 

 were made on small rats. 



In all these experiments the animals were given a preliminary half-hour 

 or so on air, in which to settle down and adjust themselves to their new 

 surroundings. Judging by the CO2 given off in some cases, the ozone appears 

 to have perhaps a transitory stimulating effect, followed by a corresponding 

 depressant effect ; in others there is but little evidence of any action of the 

 ozone at all at concentrations such as these. The ozone itself was always in 

 concentrations far less than one part per million, and varied from day to day 

 according to the atmospheric conditions prevailing. "We should state that 

 several of our figures obtained during and after ozone show a E.Q. above 1, 

 confirming the observations of Bohr as to the diminished uptake of oxygen. 



Turning to the investigation of the respiratory metabolism of man under 



VOL. LXXXIV. — B. 2 H 



