794 Experiments 



January 20. A. Barley 11 cm., all yellow, dying; B and C, barley 

 20 cm., stalks yellowish; D, 14 cm., very green. 



So B and C sent out stalks longer than D, but not as healthy; 

 A is in very bad condition. 



Experiment CCCLXXVIII. March 11. 40 seeds of barley and 

 of cress are sown on wet filter paper, and placed: 



A. In a bell of 2.5 liters, full of air at normal pressure. 



B. Bell of 2.25 liters; normal pressure; air containing 30.2% of 

 oxygen, which corresponds to about W% atmospheres of air. 



C. Bell of 2.6 liters; normal pressure; air containing 43% of 

 oxygen, or a little more than 2 atmospheres of air. 



D. Bell of 2.5 liters; normal pressure; air with 58.3% of oxygen, 

 or 2% atmospheres of air. 



March 29. Experiment stopped; the barley and the cress have 

 sprouted in all four bells; in A and B the sprouts are a little greener 

 and from 1.5 to 2 cm. longer than in C and D. Besides, the air in B 

 contains only 17.5% of oxygen, with 13.4% of carbonic acid; the 

 air in C contains 28.2% of oxygen and 12.3% of C0 2 ; that in D, 44.8% 

 of oxygen and 11.2% of CO,; the air in A has been renewed. 



Experiment CCCLXXIX. May 6. Sowings of barley. 



A. Air with 94% of oxygen, that is, 4M> atmospheres of air. 



B. Ordinary air. 



May 13. The barley has sprouted in both; A seems a little better 

 and is greener. 



But on the following days, B has the advantage, and on May 20, 

 the sprouts in A are only 2 to 3 cm. high, whereas those in B are 

 8 to 9 cm. high. 



However, the analysis of the air in B discloses no more oxygen, 

 and there is 25.4% of carbonic acid; in A, there is 19.9% of C0 2 , and 

 only 71.6% of oxygen. 



The average oxygen tension then was about 4 atmospheres of air. 



C. Low Pressures : Superoxygenated Air. 



Experiment CCCLXXX. November 4. Sowings of barley and 

 cress on wet paper. 



A. At a pressure of 3 atmospheres of an air containing 86.9% 

 of oxygen. The tension of this gas is then 260, corresponding to 

 about 12 Vz atmospheres of air. 



B. Normal pressure, ordinary air. 



November 7. Nothing in A; a few sprouts in B. 



November 11. Nothing in A; all have germinated in B. The air 

 in A still contains 86.2% of oxygen, with 0.7% of carbonic acid. 



The seeds in A are sown on wet earth. November 20, the cress 

 begins to sprout, but the barley is dead. 



Experiment CCCLXXXI. May 31. Sowings of barley seeds on 

 wet paper. 



A. 5 gm. in the cylindrical reservoir at 3 and Vs atmospheres of 

 an air containing 54% of oxygen; the tension corresponds to 180, that 

 is, about 9 atmospheres of air. 



