viii PBEFACE 



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

 superabundant. Nor must the ' Life and Letters of Charles 

 Darwin' (briefly cited as C.D.) 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. 



