342 



RESPIRATION 



2nd cervical. 



3rd dorsal. 



Figure 83. 



Shows the distribution of extravascular bubbles in five regions of the spinal 

 cord of goat 3 (series IV). The animal died of oxygen poisoning during de- 

 compression after 3 hours' exposure at 81 Ibs. in an atmosphere containing 

 36 per cent oxygen. The bubbles are practically confined to the white matter 

 and are there especially concentrated in the boundary zone where the circula- 

 tion is least good. Each diagram is a composite drawing showing all the bubbles 

 in 0.4 mm. length of cord. (After Boycott, Damant, and Haldane.) 



