Compressed Air; CX Poisoning 751 



3. Aquatic or Invertebrate Animals. 



The experiments reported up to this point were made only with 

 vertebrate air-breathing animals: mammals, birds, frogs. It was in- 

 teresting to study the action of oxygen at very high tension on in- 

 vertebrate air-breathing animals and on aquatic animals. 



Experiment CCCXI. April 25. Beetles, flies, caterpillars; centi- 

 pedes; woodlice; arranged in two similar groups. 



A. Placed in a corked flask; ordinary air, normal pressure. 



B. In the compression apparatus, and taken to 6 superoxygenated 

 atmospheres; the pressure falls to 2 atmospheres. 



April 26. All alive except the flies in B. 



Experiment CCCXII. May 12. 



Lizard; golden beetles; carpenter bee, loaded with mites; drone, 

 red fleas; flies; spiders; woodlice; centipedes. 



At 5 o'clock in the evening, taken to 6 superoxygenated atmos- 

 pheres. 



May 13; 10 o'clock in the morning, decompressed. 



The drone, the flies, the woodlice are dead, as are several red 

 fleas; the others still move their feet a little, as does the carpenter 

 bee. 



The lizard has spontaneous and excitable convulsions; he dies 

 some hours afterwards. 



The beetles, the spiders, the mites, the centipedes are in good 

 condition and survive. 



Experiment CCCXIII. May 14. 



Golden beetle, bees, ants, red fleas, wood fleas; flies; woodlice; 

 spiders; snails; earthworms. 



At 5 o'clock in the evening, placed in the cylindrical glass appara- 

 tus, with branches, earth, etc., to allow them to separate from each 

 other. Taken to 5 superoxygenated atmospheres. 



May 15, 2 o'clock. All dead except the spiders, the earthworms, 

 which are twisted and intertwined, and the snails. 



,A11 die in the open air. 



Experiment CCCXIV. May 16. 



A Capricorn beetle, 1 dragon fly, 1 blue butterfly, several bees, 

 drones, ants, red fleas, flies, syrphus flies; centipedes, geophiles; wood- 

 lice; spiders. 



At 11 o'clock in the morning, taken to 5 superoxygenated atmos- 

 pheres; at 1 o'clock raised to 6; at 2 o'clock to 11 atmospheres. 



Almost immediately all fall to the bottom, motionless, except the 

 ants and the centipedes, which run up and down. 



The flies die in a half hour at most. 



4 o'clock; none of the insects are moving. Decompression made. 



The bees, the flies, the syrphus flies, and the butterfly are dead. 



The Capricorn beetle, the dragon fly, the drones, the fleas, the ants, 

 the woodlice are still moving a little. 



The myriapods and the spiders are in good condition. 



