CONTENTS. 
CHAP. PAGE. 
I.—INTRODUCTION . ‘ ; ; ; ; F I 
I1.—THE PRESENT FLORA OF BRITAIN . . 10 
III.—MEANS OF DISPERSAL : F ; “20 
IV.—-CHANGES IN GEOGRAPHY AND CLIMATE 2. 638 
V.— DEPOSITS CONTAINING FOSSIL PLANTS. . 48 
VI.—FORMER DISTRIBUTION OF BRITISH PLANTS. 97 
APPENDIX.—TABLE SHOWING THE RANGE IN TIME 
OF THE BRITISH FLORA . ‘ ‘ ‘ . 171 
