THE EFFECTS OF EXCESS OF CARBON DIOXIDE 209 



found to be 35 millimetres above the oxygen-pressure in the alveolar 

 air. But there are doubts as to the validity of this method. 



Airmen usually suffer at altitudes from 15,000 to 20,000 feet. In 

 their case there is no evidence of acclimatization to the effects of high 

 altitudes. Administration of oxygen mitigates these ill effects. 



FIG. 175. AIR BUBBLES SET FREE IN VESSELS OF HEART AFTER RAPID 

 DECOMPRESSION, (v. Schrotter.) 



Increased Atmospheric Pressure Caisson Disease. In contra- 

 distinction to the effects of diminished barometric pressure, increased 

 barometric pressure in itself produces no untoward symptoms. " Caisson 



/ 



Fi.;. 176. To SHOW GAS BUBBLES IN ARTERIES AND VEINS OF INTESTIXES~AFTER 

 RAPID DECOMPRESSION, (v. Schrotter.) 



disease " and " diver's palsy " result from the effects of decompression 

 from a high atmospheric pressure, not from the compression. Caissons 



