Permeability 247 
While the propounding of theories will continue to satisfy the 
minds of some, yet it cannot be too strongly emphasized that what 
are wanted to lay the foundations of a proper understanding of the 
phenomena of permeability in plants are facts, and particularly 
quantitative data. When these are abundant where they are now 
scanty we may be able to formulate the laws governing the inter¬ 
change of substances between the cell and its surroundings, and so 
be in a much better position for understanding not merely the 
mechanism of cell permeability, but also the life of the plant as 
a whole. 
LITERATURE CITED 
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(3) Adair, G. S. The Penetration of Electrolytes into Gels. II. The Applica¬ 
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(4) Andre, G. (1906 a). Sur la composition des liquides qui circulent dans 
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(5) - (1906 6). Sur la composition des sues vegetaux extraits des racines. 
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(7) -(1907 b ). Sur la migration des principes solubles dans le vegetal. 
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(8) Arrhenius, S. Einfache Ableitung der Beziehung zwischen osmotischen 
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(9) - Untersuchungen fiber Diffusion von in Wasser gelosten Stoffen. 
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(10) Artari, A. Zur Ernahrungsphysiologie der griinen Algen. Ber. deut. bot. 
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(11) Asher, L. Die Lehre von Stoffaustausch der Zellen. Corresp. Blatt. f. 
Schweizer Aertze, No. 9. 1912. Cited from Bayliss (1915). 
(12) Atkins, W. R. G. Cryoscopic Determinations of the Osmotic Pressures 
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(13) Atkins, W. R. G. and Wallace, T. A. The Critical Solution Point of 
Urine. Biochem. Journ. 7, 219-230. 1913. 
(14) Bartell, F. E. The Permeability of Porcelain and Copper Ferrocyanide 
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(15) -- Negative Osmose. Journ. Amer. Chem. Soc. 36, 646-656. 1914. 
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(17) -(19166). The Osmose of some Solutions of Electrolytes with 
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Potential. Journ. Amer. Chem. Soc. 37, 1036-1050. 1916. 
