878 Experiments 



Experiment DLXXVIII. October 28. Dog of the preceding ex- 

 periment, quite recovered. 



Taken to 10 atmospheres; after 5 minutes, has an attack of con- 

 vulsions. At the end of 15 minutes, decompression is made at the 

 rate of 8 minutes per atmosphere, very regularly, the whole requir- 

 ing 1 hour 12 minutes. 



Shows no symptom either immediate or delayed. 



Experiment DLXXIX. November 14. Dog. 

 Taken to 9 atmospheres. Decompressed in about 1 hour. 

 When taken from the apparatus, its rectal temperature is 20°. 

 It has loud gurgles in the heart and soon dies. 



Experiment DLXXX. June 27. Dog weighing 19.3 kilos. 



From 1 o'clock to 2 o'clock is raised to IVz atmospheres, with 

 a current of air. A leak develops; at 3 o'clock, the pressure is 6 

 atmospheres; at 6:45 it is only AVz atmospheres, in spite of the con- 

 stant pumping. 



Decompressed from 6:45 to 7:45. 



When taken out, the big dog is very wet, cold, dying; it dies after 

 a few breaths. Pulmonary ecchymoses are found, and gas everywhere 

 in the blood. 



Experiment DLXXXI. June 27. Two puppies, very young, weighing 

 about 1.5 kilos. n 



Placed beside the animal of the preceding experiment. 



The puppies are also very wet; but they show no symptom, either 

 immediate or delayed. 



I summarize in Table XIX the data relating to the progressive 

 and slow decompression. 



3. Summary and Conclusions from the Preceding Experiments. 



Let us now consider these experimental results in their entirety. 

 The first striking fact when we examine Table XVIII is that sudden 

 decompression is much less dangerous to birds than to mammals. 

 A sparrow, in fact, (Exp. DX) survived the decompression from 10 

 atmospheres, another (Exp. DXIII) did not die for a long time 

 after a decompression from 14 atmospheres. 



On the contrary, in mammals, symptoms began to appear at 6 

 atmospheres (Exp. DXXX) ; death struck almost all the animals 

 decompressed from 8 atmospheres, and all of those decompressed 

 from 9. Dogs and cats seemed even more susceptible than rabbits; 

 Experiments DXX and DXXVI made simultaneously on a cat 

 which died and a rabbit which survived, are characteristic, except 

 for individual differences. 



In the same species, in fact, we notice differences which are 

 very important. In dogs, for example, we have always had severe 



