740 NOTES 



landt : P.J. 17, 1886. Id. Flora. 1887. Leitgeb : Mitt. Bot. Inst. Graz. Schaefer : 

 P.J. 19. Kohl : Bot, Centr. 64, 1892. Schellenberg : B.Z. 1896. F. Darwin : 

 Phil. Trans. 190 B, 1898. Id. Proc. Roy. Soc. 63, 1898. Westermaier : Festschr. 

 fur Schwendener, Berlin, 1899. Copeland : A.B. 16, 1902. Porsch : D. Spaltoff- 

 nungsapparat im Lichte d. Phylogenie, Jena, 1905. This treatise contains many 

 interesting observations and also a very complete b'st of the literature dealing with 

 the structure, function and distribution of stomata. Von Guttenberg : Engler's 

 Jahrb. 38, 1907. 



[220. The "lines of attachment" ( Wandansatze) are the apparent lines of 

 insertion of the outer tangential walls of the adjoining epidermal cells on the dorsal 

 walls of the guard-cells. Actually, they are as was pointed out by Schwendener 

 himself (Ges. Bot. Mitth. p. 44, foot-note) the horizontal projections of the sharply 

 curved edges of these tangential walls, where they bend inwards in order to insert 

 themselves upon the dorsal guard-ccll-walls. ] 



221. Westermaier : Monatsber. Berlin. Akad. 1881. 



222. Brown and Escombe : Phil. Trans. 193B, 1900. 



223. When considering stomata as minute perforations of a septum, it is necessary 

 to bear in mind that the cross-section of the pore is elliptical. Diffusion takes place 

 with equal velocity through elliptical and circular apertures of the same cross- 

 sectional area. In order, therefore, to estimate the relative rates of diffusion through 

 stomatic pores of different sizes, it is necessary to calculate the diameters of circular 

 openings of the same cross-sectional area. The velocities of diffusion will then be 

 directly proportional to these diameters. 



224. Merget : C.R. 87, p. 293. Stahl : B.Z. 1894. F. Darwin : Proc. Cambr. 

 Phil. Soc. 9, 1897. Id. B.G. 37, 1904. 



225. [N.B. This note applies to Section 4 of Ch. IX., not to Section 3 as inad- 

 vertently suggested in the text.] Pfitzer : P.J. 7, 1870. Tschirch : Linnaea, 

 N.F., 9, 1881. Id. Abh. Bot. Ver. Brandenburg, 23, 1881. Wilhelm : Ber. 1883. 

 Volkens : Die Flora d. agyptisch-arabischen Wiiste, Berlin, 1887, pp. 49 sqq. Gilg : 

 Engler's Jahrb. 22, 1891. Wulff : Ost. Bot, Zeitschr. 1898. 



226. G. Haberlandt : I.e. [8]. 



227. G. Haberlandt : Flora, 1887. 



228. Kraus : P.J. 4, 1866. Mahlert : Bot. Centr. 24, 1885. Klemm : P.J. 

 17, 1886. Porsch : I.e. [220]. 



229. G. Haberlandt : P.J. 17, 1886, pp. 457 sqq. 



230. Leitgeb : Sitzb. Wien. 1880. Voigt : B.Z. 1879. Kamerling : Flora. 

 1897 (Erg.-Bd.). 



231. Benecke : B.Z. 1892. 



232. A. Weiss : P.J. 4. 



233. Porsch : Sitzb. Wien, 102, 1903. 



234. Stahl : B.Z. 1873. G. Haberlandt : Sitzb. Wien, 1875. Klebahn : Ber. 

 1883. Id. Jena. Zeitschr. 17 (X.F. 10). 1884. Devaux : Ann. Sci. Nat,, ser. VIII., 

 12, 1900. Devaux erroneously regards the regulation of transpiratory activity as 



