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Isabel Soar 
5. The suberisation and lignification of the radial walls renders 
the endodermis relatively impervious to the passage of water through 
the walls alone. Thus the transpiration current must flow largely 
through the endodermal cell, and it is probable that the protoplasm 
exerts some control over the rate of flow. 
BIBLIOGRAPHY 
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(2) - Form-Factors in Coniferae. Ibid. No. 9. 
(3) Daguillon, A. Observations sur la structure des feuilles de quelques 
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(4) -Sur le polymorphisme fcliaire des Abietinees. ComptesRendus. 1889. 
(5) - Recherches morphologiques sur les feuilles des Coniferes. Revue 
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(6) De Bary, A. Comparative A natomy of the Vegetative Organs of Phanerogams 
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(7) Groom, P. Remarks on the (Ecology of the Coniferae. Annals of Botany, 
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(8) Haas, P. and Hill, T. G. An Introduction into the Chemistry of Plant 
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(9) Haberlandt, G. Physiological Plant Anatomy, translated by Montague 
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(10) Jeffrey, E. C. The Comparative Anatomy of the Coniferales. II. The 
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(12) Priestley, J. H. The Mechanism of Root Pressure. New Phytologist, 19 . 
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