A chemical study of apple twigs

Abstract

<p>At the suggestion of the Director, with whom the idea originated, I have made a short study of apple twigs with the object of learning whether there exist, in mid-winter, any differences in composition between the new growth of those varieties of apple which are hardy and those which are non-hardy in the climate of Central and Northern Iowa.</p> <p>Four varieties of twigs were studied, namely, Duchess of Oldenburg, Borovinca, Ben Davis and Boiken— the two first named being regarded as hardy and the two latter as non-hardy varieties. The twigs were taken from the trees, and the work done during January just passed. The Ben Davis twigs were from a single large tree*— the only one available— the Duchess from four large trees, the Boiken and Borovinca each from a number of nursery trees, three to five years from the graft; all were apparently well matured.</p>