790 Experiments 



Experiment CCCLXVI. March 30. Sowings of 20 barley, seeds on 

 the same quantity of paper wet with 10 cc. of water. 



A. Small Seltzer water receiver; 2 atmospheres of air changed 

 every day, sometimes twice a day. 



B. Similar receiver, corked at normal pressure. 

 April 3. Radicles appearing in both. 



April 7. A. Is a little slow, in comparison with B. 



Experiment CCCLXVII. April 16. Sowings of 20 barley seeds. 

 Same quantity of paper and water. 



A. Small Seltzer water receiver without a wire jacket; taken to 

 2V2 atmospheres. As this receiver leaks a little, I recharge it at least 

 twice a day, sometimes to 3 atmospheres; this gives sufficient ven- 

 tilation. 



B. Similar receiver, with a jacket, corked; normal pressure; air 

 changed every day. 



April 19. Radicles appear in A and B. 



April 24. No very clear difference; the shoots are about 6 cm. 

 high, but they are a little paler in A than in B. 



April 28. The two sowings are almost identical, measuring 10 to 

 12 cm. The shoots in A are not as green as those in B, and yet they 

 receive considerably more light. 



Experiment CCCLXVIII. April 28. Sowings of 20 barley seeds 

 and radish seeds. 



A. In the cylindrical receiver, at 10 atmospheres of air; the 

 air is changed every day, morning and evening. 



B. In a vessel poorly corked; normal pressure. 



May 7. A. No apparent development; B. The radish sprouts are 

 1.5 cm. high; the barley sprouts 3 cm. high. 



May 12. A. A very few radicles of radish and barley. 



B. The radish shoots are 3 to 5 cm. high; the barley, 5 to 8 cm. 

 I make the decompression and sow A on wet paper; the radishes 

 begin to sprout May 16; the barley molds. 



Experiment CCCLXIX. June 11. Sowed 20 barley seeds and 20 

 cress seeds. 



A. In the cylindrical receiver, at 5 atmospheres of air; air changed 

 twice a day. 



B. In a closed test glass; normal pressure. 



June 13. A few radicles of barley and cress in A and B. 



June 16. A. The cress has germinated; the barley has not sprouted. 



B. Cress finer than in A; barley measuring 1 to 2 cm. 



June 18. A. The cress sprouts are 1.5 cm. to 2.5 cm. high; the 

 leaves are not yet unfolded and do not smell of cress; the barley 

 sprouts, to the number of 16, are beginning to leave their cover, and 

 are 1.5 cm. to 4 cm. high. 



B. The cress sprouts, 3 cm., very green, spread out in a rosette, 

 smelling very strong of cress; 20 barley shoots from 8 to 9 cm., some 

 as high as 12 cm. 



