624 ANNUAL. REPORT SMITHSONIAN INSTITUTION, 1911. 



Table II. 



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 C0 2 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 concentra- 

 tions such as these. The ozone itself was always in concentrations 

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

 ing to the atmospheric conditions prevailing. We should state that 

 several of our figures obtained during and after ozone show a R.Q. 

 above 1, confh^mmg the observations of Bohr as to the diminished 

 uptake of oxygen. 



Turning to the investigation of the respiratory metabolism of man 

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

 by Dr. Gordon Douglas, 1 of Oxford, owing to its simplicity and 

 efficiency. 



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



