viii 
Preface 
There remains the pleasant duty 
of thanking the various British authori- 
ties, societies, and naturaHsts who have 
generously supplied me with informa- 
tion. In particular, I beg to tender 
my heartfelt thanks to Professor F. W. 
Oliver, Mr Clement Reid, Professor 
A. C. Seward, Dr W. G. Smith, 
Mr A. G. Tansley, and, last but not 
least, Dr C. E. Moss, who has kindly 
revised my English manuscript, and 
seen my book through the press. 
H. C. 
30 November^ 1908. 
Danzig. 
