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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 
(1) Church, A. H. Elementary notes on Conifers. Oxford Botanical Memoirs, 
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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 Abi6tinees. ComptesRendus. 1889. 
(5) - Recherches morphologiques sur les feuilles des ConiRres. 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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(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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(13) - Suberin and Cutin. New Phytologist, 20. 1921. 
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