52 



THE COMPOSITION OF EXPIRED AIR, 



variations must be kept in niind constantly in comparing these two charts, as well as in comparing 

 the results obtained in any of the other forms of experiment. 



CHART III.— SiiowiNO THK Relative Proi'ORTI"ns ov COj and O, before and ai-tkr each Experiment 



WITH THE ReLATIVK |)i h,mi,.\ (M 1.111. IN I 111 TXll RlMl.Mb WITH THE ARTIFICIAL GASEOUS MIXTURES. 



r ^— ^— — Kcprescuts rtlnlive [.rdjiorlion ol (_LI. btlure, and 



Key J -X — X— ' O 



— — ^— " duration of life. 



after, the experiment. 



The mode of death in these experiments, when sufificient O was present to support life for 

 several hours, was similar to that noted in the " Hammond " experiments, in the experiments with 

 atmospheric air in closed vessels, and in the " Rrown-Scquard " exi)erimenls, and could not be dis- 

 tinguished from death in COj poisoning. When such an amount of O was not present, death was 

 often almost instantaneous, following, at the longest, within five minutes after the animal was placed 

 in the jar. After a few gasps and several violent struggles, life became extinct. 



A number of the animals used in this series of experiments were examined />os/ morUm. The 

 gross appearances presented in these animals were of the character of those found ordinarily in 

 cases of CO, poisoning. Intense venous engorgement was noted in all the organs and tissues. 



