Carbon Dioxide in Maturation, etc., of Seeds. 



625 



are related to an inhibitory partial pressure of carbon dioxide in the tissues of 

 the embryo. 



(3) Germination when it takes place is related to a lowering of the value 

 of this inhibitory partial pressure of carbon dioxide in the tissues. 



(4) The inhibitory value of a given carbon dioxide pressure diminishes with 

 a rise of temperature. 



(5) The inhibitory value of a given carbon dioxide pressure diminishes with 

 a rise of oxygen pressure. 



LITEEATUEE CITED. 



1. Farmer, J. B., and S. E. Chandler, " On the Influence of an Excess of Carbon Dioxide 



in the Air on the Form and Internal Structure of Plants," ' Boy. Soc. Proc.,' vol. 70, 

 pp. 413-422 (1902). 



2. Brown and Escombe, " The Influence of varying Amounts of Carbon Dioxide in the 



Air on the Photosynthetic Process of Leaves and on the Mode of Growth of 

 Plants," ' Eoy. Soc. Proc.,' vol. 70, pp. 397-413 (1902). 



3. De Saussure, ' Eecherches Chimiques sur la Vegetation,' Paris, 1804. 



4. Montemartini, " Sulla Influenza di Atmosfere ricche di Biossido di Carbone sopra lo 



Sviluppo e la Struttura delle Foglie," ' Atti del Istituto Botanico di Pavia,' 1892. 



5. Chapin, P., " Einfluss der Kohlensaure auf das Wachsthum," ' Flora,' 1902, p. 348-379. 



6. Bohm, Jos., ' Sitzungsberichte der Wiener Akademie,' 1873. 



7. Drabble, Dr. E., and Miss Lake, "On the Effect of Carbon Dioxide on the Geotropic 



Curvature of Eoots of Pisum sativum, L.," 'Eoy. Soc. Proc.,' B, vol. 76, pp. 351-358 

 (1905). 



8. Becquerel, "Eecherches sur la Vie Latente des Graines," 'Ann. Sci. Nat., Bot.,' ser. 9, 



5, pp. 193-307 (1908). 



