Experiments on Plants 789 



Experiment CCCLXII. July 7. Sowings of barley on wet filter 

 paper. 



A. Receiver of 1 liter, taken to 1 and % atmospheres. 



B. Similar receiver; normal pressure; well corked. 

 July 9. B. Begins to sprout; A. Nothing. 



July 10. B. The sprouts are about 2 cm. high; they begin to ap- 

 pear in A. 



The air is renewed every day. 



July 13. B. Sprouts about 12 cm. high; A. Only 8 to 10 cm. high. 

 Experiment stopped. 



Experiment CCCLXIH. July 13. Sowings of barley on wet filter 

 paper. 20 seeds in each sowing. 



A. Cylindrical receiver holding 650 cc, taken to 5 atmospheres. 

 Air changed every day. 



B. Test glass of about the same dimension; left at normal pressure; 

 well corked. 



July 16. Germination begins in B. 



July 18. In B, the sprouts are about 7 cm. high; germination is 

 beginning in A. 



July 20. B. 13 cm.; A. 3 to 5 cm. 



July 26. B. 18 cm.; A. 3 to 5 cm. 



Decompression made, the different seeds removed carefully and 

 placed on wet earth. 



A. Grows rapidly and nearly overtakes B. 



Experiment CCCLXIV. July 31. Sowings of barley on wet paper. 



A. Cylindrical receiver taken to 10 atmospheres. 



B. Test glass of same volume; normal pressure; well corked. 

 August 3. Germination begins in B. 



I decompress A; but on recharging it, I cannot get it above 7 

 atmospheres. 



August 5. The sprouts in B are 5 to 6 cm. high; in A, only a few 

 radicles have sprouted. 



August 7. 13 cm. in B; in A, only a few radicles. 



I stop the experiment; the air in A, when analyzed, contains no 

 carbonic acid. 



A. Sown on wet paper; has not begun to germinate August 10. 



Experiment CCCLXV. March 1. Sowings of 30 barley seeds. 



A. In the cylindrical reservoir, ordinary air, pressure of 2% 

 atmospheres. 



B. Closed test glass; normal pressure. 

 March 4. Air changed. 



March 8. Shoots greener and longer in B than in A. Air changed. 



March 10. A. 9 seeds not germinated; 11 with radicles only; 10 

 with pale shoots 2 cm. long. 



B. 11 seeds not germinated; 5 with radicles only; 11 with fine 

 green shoots 4 cm. long. 



