187 
I concealed my views, but chiefly from the interest which I had 
long taken 1n the subject.”—Darwin to A. de Candolle. 
“The ‘ Descent of Man’ took me three years to write, but then 
as usual some of this time was lost by ill health, and some was 
consumed by preparing new editions and other minor works.”-— 
Autobiography. 
“During many years I collected notes on the origin or descent 
of man, without any intention of publishing on the subject .. . as 
I thought that [ should thus only add to the prejudices against my 
views. —/ntroduction. 
127. The different forms of flowers on plants of the same species. 
First edition. London, 1877. 
ie no little discovery of mine ever gave me so much pleasure 
as the making out the meaning of heterostyled flowers.”—4uto- 
biography. 
128. The effects of cross and self fertilisation in the vegetable 
kingdom, First edition. London, 1876. 
Records one of the first recognitions and clear descriptions of 
“hybrid vigor.” 
“IT was led to make, during eleven years, the numerous experi- 
ments, recorded in this volume, by a mere accidental observation : 
and indeed it required the accident to be repeated before my atten- 
tion was thoroughly aroused to the remarkable fact that the seed- 
iings of self-fertilised parentage are inferior, even in the first 
generation, in height and vigour to seedlings of cross-fertilised 
parentage.” —Alutobiography. 
129. The expression of the emotions in man and animals. First 
edition. London, 1872. 
3egun January 17, 1871, “the last proof of the ‘ Descent of 
Man‘ having been finished on January 15.” 5267 copies were sold 
on the day of publication. 
zi the subject is in no way an important one; it is simply 
a ‘hobby-horse’ with me, about twenty-seven years old.” 
