vi NOTE 



there be, but, I fear, at the cost of some disappoint- 

 ment to others who had hoped to see their interesting 

 correspondence with Newton included in the book. In 

 cutting down I have tried to act on the principle of 

 preserving his best and most characteristic letters on 

 whatever subject, rather than of including technically 

 important matters, which are elsewhere accessible to 

 naturalists. 



The help that I have received from Newton's friends 

 and from members of his family has, I hope, been in 

 every case gratefully acknowledged. There are two — 

 Mr. James E. Harvie-Brown and Lord Walsingham — 

 whose names must be recorded here : both of them 

 have followed their old friend, but not before they had 

 given me incalculable help in my attempt to preserve 

 his memory. 



A. F. R. W. 



April, 1921. 



