3 1 8 Kisch. — The Physiological Anatomy of 
main supporting tissue of the stems, for which it was well qualified by its 
physical properties. 
In addition to its mechanical function it is possible that it acted as 
reserve storage tissue, for which there is no adequate provision elsewhere 
than in the cortex. 
The periderm, as far as has been ascertained, does not appear to have 
become the outermost tissue, and is not primarily a protective integument, 
as is the periderm of recent plants. 
The above investigation was undertaken at the suggestion of Professor 
F. W. Oliver, and I should like to take this opportunity of expressing my 
thanks to him for all his help and advice, and to Mr. T. G. Hill, who has 
also given me much kind assistance. 
Literature cited. 
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other Eusigillarian Stems, in comparison with those of other Palaeozoic Lycopods. Phil. 
Trans. Roy. Soc., vol. cc B, 1908, p. 133. 
2. : A Note on the Structure of the Cortex of Sigillaria 
mamillaris , Brengn. Ann. Bot., vol. xxiii, 1909. 
3. Bertrand, C. E. : Remarques sur le Lepidodendron Harcourtii de Witham. Trav. et Mem. Fac. 
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6. — : Observations on the Structure of Fossil Plants found in the Carboniferous 
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7. : Part iv, Sigillaria and Stigmaria. Ibid. 1875. 
8. Brongniart, A. : Observations sur la structure interieure du Sigillaria elegans. Arch. Mus. 
d’Hist. Nat., vol. i, 1839, p. 405. 
9. Dawes, J. S. : Remarks upon the Internal Structure of Halonia. Quart. Journ. Geol. Soc., 
vol. iv, 1848, p. 289. 
10. Dawson, J. W. : On the Structure and Affinities of Sigillaria , Calamites , and Calamodendron. 
Quart. Journ. Geol. Soc., vol. xxvii, 1871, p. 147. 
11. DE Bary, A. : Comparative Anatomy of the Phanerogams and Ferns. Oxford, 1884. 
12. Gordon, W. T. : On Lepidophloios Scottii, a new Species from the Calciferous Sandstone 
Series at Pettycur, Fife. Trans. Roy. Soc. Edin., vol. xlvi, 1908, p. 443. 
13. Haberlandt, G. : Physiologische Pflanzenanatomie. Leipzig, 1896. Fourth edition, 1909. 
14. Hick, T. : On a new Fossil Plant from the Lower Coal Measures. Journ. Linn. Soc. Bot., 
vol. xxix, 1893, p. 86. 
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Normandie, vol. xvii, 1892, p. 5. 
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