The President's Address. IN accordance with the custom that is growing up of arranging for a minimum of clashing between the various, presidential addresses, Prof. Trail delivered his address (which was printed in full in NATURE of October 6) at. 12 noon on Thursday, September 1. The address dealt with the subject of field botany, and the president particularly urged the need for the preparation of a really great national flora. As a direct outcome of the address, a committee was subsequently appointed, with Dr. Trail as chairman, to consider what steps should be taken towards organising and preparing the materials for such a flora.