BIBLIOGRAPHY. 73 



110. Wiegaxd. K. M. Some studies regarding the biology of buds and twigs in winter. 



Bot. Gaz., 41: 373-424, 1906. 



111. — The occurrence of ice in plant tissues. Plant World, 9: 25-39, figs. 4-5, 



1906. (Contains a very full bibliography of this subject.) 



112. Wieler, A. Untersuchungen iiber die Einwirkung schwefliger Saure auf die 



Pflanzen, pp. 1-427, 1905. 



113. Wilcox, E. Mead. A rhizomorphic root rot of fruit trees. Okla. Agr. Expt. Sta., 



Bui. 49: 1-32. pis. 1-11,1901. 



114. A leaf-curl disease of oak<. Ala. Agr. Expt. Sta., Bui. 126: 171-187, 1903. 



