IRRITABILITY. 555 



Movements of Variation: 



Pfeffer; Die periodischen Bewegungen der Blattorgane, 1875. 



de Vries; Archives Nderlandaises, XV, 1880. 



Unger; Anatomic und Physiologic der Pflanzen, 1855. 



Pohl; 1779; (quoted by Morren in his paper on MegacHnium falca- 



tum, Me'm. de 1'Acad. roy. de Bruxelles, xv, 1841). 

 Lynch; Journ. Linn. Soc., XVI, 1877: also Darwin, Movements of 



Plants, 1880, p. 330. 

 Morren; Me'm. de 1'Acad. roy. de Bruxelles, XV, 1841 : also, Ann. d. 



sci. nat., sdr. 2, xix, 1843. 

 Kabsch; Bot. Zeitg., 1861, p. 345. 

 Gad; Bot. Zeitg., 1880, p. 216. 



Morren ; Me'm. de 1'Acad. roy. de Bruxelles, xiv, 1841, and v, vi. 

 de Candolle; Physiologic, II, p. 860, 1832. 



Bert; Me'm. de la Soc. d. sci. phys. et nat. de Bordeaux, vin, 1870. 

 Pfeffer ; loc. cit. 



Darwin; Movements of Plants, 1880, p. 313. 

 Kabsch; loc. cit. 

 Sachs; Flora, 1863. 



Light: 



Cohn; Verhand. d. Schl. Ges. fiir vaterland. Cultur, 1859. 



Batalin; Flora, 1871. 



Pfeffer; Physiologische Untersuchungen, 1873. 



Sachs; Bot. Zeitg., 1857. 



Bert; Me'm. de la Soc. d. sci. de Bordeaux, vm, 1870. 



Periodic movements : 



Darwin; Movements of Plants, 1880. 



Bert; Me'm. de la Soc. des sci. de Bordeaux, iv, 1866, and vin, 



1870. 

 Millardet; Nouvelles Recherches sur la Pe'riodicite' de la Tension, 



Strasbourg, 1869. 



Sachs; Flora, 1863: Experimental Physiologic, 1865. 

 Pfeffer; Die periodischen Bewegungen der Blattorgane, 1875. 



Temperature : 



Pfeffer; Physiologische Untersuchungen, 1873, p. 78. 

 Millardet; loc. cit. 



Other induced movements : 



Pfeffer; Physiologische Untersuchungen, 1873, p. 80. 



Morren: Me'm. de 1'Acad. roy. de Bruxelles, xiv, 1841, and xn, 



1839- 

 Darwin: Insectivorous Plants, 1875. 



