Age and Area: 
A Reply to Criticism, with Further Evidence. 
BY 
J. C. WILLIS, M.A., Sc.D., F.R.S., 
European Correspondent, Botanic Garden , Rio de Janeiro. 
With five Figures in the Text. 
Contents. 
PAGE 
General.193 
The Criticisms of Mr. C. Tate Regan (with a Note on Distribution of Family 
Names).. 201 
Some Statistics of the British Flora, to show the Trifling Differences due 
to ‘Lumping’ and ‘Splitting’, or to Continued Work upon the same Flora 209 
The Distribution of Genera by Sizes in Definite Areas; a Difficulty for the 
Supporter of Relicdom...* . 210 
Prediction applied to the Flora of the British Islands.211 
A Correction of Previous Work upon the Flora of Ceylon .... 213 
Summary.214 
General. 
W ITH a paper in October, 1921 ( 10 ), I began a second series of 
communications, of wider scope than the first ten, though also 
based upon Age and Area. My first intention was to continue the series in 
logical order until I had published the whole theory of Age and Area and 
its many implications, but when I fully realized that to do this would take 
perhaps six or seven years, I determined to bring out a book dealing chiefly 
with Age and Area, and incidentally with its further implications. To this 
course I was also strongly urged by various friends. The book ( 11 ) has now 
appeared, and contains original matter that would have sufficed for at least 
another dozen papers. A gap is thus made between this paper and the 
last, which I must ask my readers to regard as filled by the publication of 
the book. 
At a joint session of the Zoological and Botanical Sections at the 
meeting of the British Association at Hull in 1922, there was a discussion 
upon 4 The Present Position of Darwinism ’, understanding thereby the 
theory of Natural Selection. At the meeting I continued the attack upon 
Natural Selection which I have persistently carried on since 1902 (cf. 5 . 
[Annals of Botany, Vol. XXXVII. No. CXLVI. April, 1923.] 
O 2 
