via
PREFACE
brought about by vegetation. The chain of physical cause and effect is universal. Every dewdrop has its tidal ebb and flow, a subtle alchemy of force that links our earth with other worlds. De minimis curat Natura. Nature is conquered by obeying her, and man is but her puppet until he learns the lesson of obedience.
   Whilst Tidal Lands is based primarily on the results of our own observations, experiments, and practice, spread over a long series of years, we have become indebted to many persons for information and help on particular points, for facilities of access to certain localities, and especially for the provision of many of the photographs here reproduced.
   Among those of whose courtesy in these various ways we desire to make particular acknowledgment are: the late Dr. Sarah Baker; Dr. Winifred Brenchley; Miss Lilian Britten, of Port Elizabeth; Mr. G. O. Case; Mr. Linn Chilvers; Dr. L. Cockayne, F.R.S., of New Zealand; Mr. A. D. Cotton; Mrs. Cowles, of Chicago; Mr. E. P. Farrow; Sir Francis Fox; Dr. Somerville Hastings; Prof. Augustine Henry; Major T. G. Hill; Lord Ilchester; Mr. Alleyne Leechman, of British Guiana; Mr. J. H. Maiden, F.R.S., of the Botanic Gardens, Sydney; Prof. J. Massart, of the University of Brussels; Dr. C. H. Ostenfeld, of Copenhagen; Mr. William Rowan; Dr. E. J. Salisbury; Prof. William Somerville; Prof. C. Schroeter, of Zurich; Mr. R. V. Sherring; and Mr. R. Hansford Worth. By the courtesy of the Council of the Linnean Society we are able to republish from their Journal fig. 42 and Plate XV, 2. Fig. 3 has been reproduced from the diagram accompanying Mr. G. C. Churchward’s letter published in the Daily Mail, 18th July, 1907.