Compressed Air; Low Pressures 777 



Experiment CCCXL. April 28. Frog tadpoles that had emerged 

 8 or 10 days before, in equal numbers. 



A, A', bells inverted over water, full of ordinary air. 



B, B', bells arranged in the same way, filled with 95% oxygen, 

 well washed. 



Controls outside the bells as in the preceding experiment. 

 May 1. All living. 



May 3. The controls and the tadpoles in A and A' are living; 

 those in B and B' are all dead. 



Experiment CCCXLI. May 8. Tadpoles; experiment prepared like 

 the two preceding, with the same oxygen kept over very clean water. 

 May 10, two tadpoles dead in the oxygen. 

 May 11, all dead in the oxygen, all alive in the air. 



Experiment CCCXLII. April 26. Frog eggs, not yet bilobed. In 

 equal numbers, in the same quantity of water, under closed bells. 



A in ordinary air. 



B in air containing 24% of oxygen. 



C in air containing 28% of oxygen. 



D in air containing 51% of oxygen. 



E was to contain at least 80% of oxygen; but the analysis could 

 not be made on account of an accident. 



May 4. A, large number of tadpoles emerged. 



B, almost as many as in A. 



C, far less. 



D, only 5 or 6. 



E, only 2. 



Later (bell E having been turned over), the development became 

 equal. 



May 21, all the tadpoles in all the bells are well and similar. 



Experiment CCCXL1II. May 28. Frog tadpoles; water. 



A, in 'flask in probably 90% of oxygen. 



B, in glass apparatus at 5 atmospheres of ordinary air. 

 The tadpoles in B die May 30. 



Those in A die May 31. 



Experiment CCCXLIV. June 2. Little eels "de la montee"; placed 

 3 in each jar. 



A, under bell full of air. 



B, under bell with more than 90% of oxygen. 



C, in the glass apparatus, at 5 atmospheres of ordinary air. 

 June 4. A, all alive. 



B, 1 dead, 2 very sick. 



C, 2 dead, the third very sick. 



Experiment CCCXLV. April 7. Frog eggs, in nearly equal quanti- 

 ties, in water. 



A, under bell full of air. 



B, under bell full of air with about 55% of oxygen. 



C, under bell full of air with about 65% of oxygen. 



D, under bell full of pure oxygen 90% to 95%. 



