Problems in Biophysics of Cell Growth 385 



mechanics of growth range from a viscosity problem to questions of 

 macromolecular metabolism. It will be important to obtain further 

 experimental evidence as to what types of bonding are important in 

 the cell wall's mechanical properties and in its ability to expand irre- 

 versibh. 



LITERATURE CITED 



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Mode of Action of Plant Growth Substances, pp. 284-291. Butterworth Sci. 

 Publ., London. 1956. 



2. Cleland, R., and Bonner, J. The residual effect of auxin on the cell wall. 

 Plant Physiol. 31: 350-354. 1956. 



3. Frey-Wyssling, A. Macromolecules in Cell Structure. 112 pp. Harvard Univ. 

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4. , Miihlethaler, K., and Wyckoff, R. Microfibrillenbau der pflanzlichen 



Zellwande. Experientia. 4: 475,476. 1948. 



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6. , Cleland, R., and Bonner, J. Methyl esterification of cell wall con- 

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7. Tagawa, T., and Bonner, J. Mechanical properties of the Avena coleoptile as 

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8. Thimann, K. V. The physiology of growth in plant tissues. Amer. Sci. 42: 

 589-606. 1954. 



