I.I i KCTS OF CARBON DIOXIDE. 



217 



It was found that with an original range of 28 to 32 per cent, 

 carbon dioxide ,md 12 to 13 per cent, oxygen there was but a 

 slight diftenmr in the final composition of the ail within the 

 bottle. Table IV. is a compilation of data within this range. It 



I = CO' 



percent gas absorbed 

 l-ii.. ;. A' - i-isa. Curve i: Per cent, gain of C< <>i' th. aniin.il. 



ivr cent, loss of Oj from tissues of the animal. <>r>lii n:- 1 

 in minutes. (For further description see text.) 



vidcnt from this table and curve I of Fig. 3 that carbon 

 dioxide i- at first rapidly, then gradually, ul>-<>iU'<l by the animal. 

 An initial v;ain in oxygen as shown in the same table and curve 2 

 of \"\. 3 may be due to the slight negative- pressure, some of the 

 oxygen diffusing out of the tracheal tubes of the.- animal. How- 

 ever, latt-r it is reabsorbed. 



Table Y. i;ives data for var>'ing percentages of < arb<m dioxide 

 combiiu-d with varying oxygen percentages. Column 3 of this 

 table 'J\ es the ratio of carbon dioxide to oxygen in each case. In 

 column 4 the lengths of time in minutes the animal- \\ere exposed 

 to the gases are noted and in columns 5 and 6 the attendant 



