yiii PEEJ^ACE 



last at ninety-four — the material to draw upon has been 

 superabundant. Nor must the * Life and Letters of Charles 

 Darwin' (briefly cited as CD.) and the *More Letters of 

 Charles Darwin ' (M.L.) be forgotten. They are a mine of 

 information about the scientific interests of the period and the * 

 personal relations between the two friends, and my grateful 

 acknowledgments to Sir Francis Darwin are repeated here. 



One more name must be mentioned in this place, a name 

 which also appears on the title-page. In gathering materials, 

 in collating letters, in furnishing personal information, the task 

 undertaken with such thoroughness by Lady Hooker has been 

 no light one. But if her careful ' spade-work ' has meant much 

 for the book, to the writer her active sympathy has meant 

 even more. 



L. H. 



October 1917. 



