NOTES 710 



67. G. Haberlandt in Schenck's Handb. d. Bot. 11, p. .")7'.i (epidermal papillae). 



68. Stahl : I.e. [64] (epidermal papillae). 



69. Ambronn : P.J. 14, (marginal pits). 



70. Damm : I.e. [51]. 



71. Hairs. Meyen : Die Sekretionsorgane d. Pflanzen, Berlin. 18.37. Weiss 

 in Karsten's bot. Unters. Berlin, 1S67. Rauter : Denkschr. Wien, 31, 1871. 

 Uhlvvorm : B.Z. 1873. Solereder, I.e. [47]. Bobisut : Sit/1). Wien. 113, 1904. 

 Renner : Flora, 1908. 



72. Screening action of hairs. L. Linsbauer : Beih. bot. Centr. 10, 1901. Bau- 

 mert : Cohn's Beitr. 9, 1907. As both these authors make use of methods which 

 are open to many objections, it is not surprising that they arrive at very divergent 

 results. 



73. Experiment with Stachys lanata. In this experiment, no account is taken of 

 the error introduced by the exposure of the uncutinised transverse septa of the hairs 

 in the case of the shaven leaf. A simple calculation will show that this error is negli- 

 gible. A leaf of Stachys lanata bears, on its upper side, 120 hairs per sq. mm., or 

 for a leaf with an area of 12-92 sq. mm. 155,040 hairs on the whole of the upper side. 

 In the case of a hair with a diameter of 011 mm., the area of a single transverse 

 septum works out at -000095 sq. mm. As the hairs are unbranched, the total area 

 of the exposed transverse walls in the aforesaid leaf is 155040 x -000095 or 14-73 

 sq. mm. Even if we assume that the evaporation through these septa is equal to 

 that of a freely exposed water-surface, the amount of water lost by the shaven leaf 

 in this way in 24 hours cannot exceed -01 g., and is thus small in comparison with 

 the total loss (-915 g.) in the same period. The actual amount lost by evaporation 

 through the transverse septa is probably much less. 



74. Goebel : Pflanzenbiol. Schilderungen, II. 1891 (Espeletia). 



75. Stinging hairs. Schleiden : Grundzuge d. wiss. Botanik (2nd ed.) 1, p. 269. 

 Von Mohl : B.Z. 1861, p. 219. Duval-Jouve : Bull. Soc. Bot. 14, 1867. G. Haber- 

 landt : Sitzb. Wien, 93, 1886. 



76. Occlusion of hairs. Keller : Nova acta, 55, 1890. 







77. Structure of cork. Von Mohl : Vermischte Schriften. pp. 212 sqq. Sanio : 

 P.J. 2, pp. 39 sqq. G. Haberlandt : Ost. bot. Zeitschr. 1875. Von Hohnel : Sitzb. 

 Wien. 76, 1877. De Bary : Comp. Anat. J. Moller : Anatomic d. Baumrinden, 

 Berlin, 1882. Kiigler : Uber das Suberin, Inaug.-dissert. Strassburg, 1884. Gilson : 

 La Cellule, 6, 1890. Van Wisseiingh : Arch, neerl. 26, 1893. Wiesner's "Saft- 

 periderm " (Ost. bot. Zeitschr. 1890) is practically nothing more than young cork 

 which has not yet become dry ; how far cork in this condition may act as a water- 

 storing tissue, is a question which requires further investigation. 



78. [The terms " cork-film " and " cork-crust " seemed to me the must convenient 

 equivalents of '" Korkhaut " and " Korkkruste."] 



7!). Imperviousnes8 of cork t<> mater. Nageli : Bot. MittheiL 1, 1863, pp. 28 sqq. 

 Eder : Sitzb. Wien, 72, 1875. 



80. Wiesner u. Pacher : Ost. hot. Zeitschr. IX7f>. No. 5 (transpiratory activity of 

 woody stems at various ages). 



