218 



JOSEPHINE ALBERTA WILLIS. 



TABLE V. 



SHOWING CHANGES IN Oj AND Co* DURING VARIOUS PERIODS OF EXPOSURE TO 

 VARYING TENSIONS OF Oz AND CO 2 . 



changes in carbon dioxide and oxygen percentages are given. 

 Figs. 4 and 5 show these results graphically. Following the 

 changes in per cent, of oxygen and carbon dioxide as shown in 

 this table as well as the curves in Figs. 4 and 5, it appears that 

 with a constant percentage of oxygen, provided it is within the 

 limit of 7 to 1 8 per cent., the rate, per minute exposure, of carbon 

 dioxide absorption increases with increasing carbon dioxide 

 percentages. In addition, it may also be said that with 75 to 

 100 per cent, carbon dioxide no measurable interchange of gases 

 takes place. 



As previously stated, oxygen may at first be given out by the 

 animal; however, in some cases it is absorbed. This absorption 



