1 62 CHARLES DARWIN 



of the ' Origin of Species.' So widely did the Darwinian 

 wave extend, and so profoundly did it affect every 

 minute point of biological and psychological investiga- 

 tion. 



Each of these later works of Darwin's consists, as a 

 rule, of an expansion of some single chapter or para- 

 graph in the ' Origin of Species ; ' or, to speak more 

 correctly, of an arrangement of the materials collected 

 and the experiments designed for that particular portion 

 of the great projected encyclopaedia of evolutionism, of 

 which the ' Origin of Species ' itself was but a brief 

 anticipatory summary or rough outline. Thus, the book 

 on Orchids, published in 1862, is already foreshadowed 

 in a part of the chapter on the Difficulties of the Theory 

 of Natural Selection ; the ' Movements and Habits of 

 Climbing Plants' (1865) is briefly summarised by 

 anticipation in the long section on Modes of Transition ; 

 the ' Variation of Animals and Plants under Domesti- 

 cation' (1868) consists of the vast array of pieces 

 justificatives for the first chapter of the ' Origin of 

 Species ; ' and the germ of the ' Cross and Self Fertili- 

 sation' (1876) is to be seen in the passage 'On the 

 Intercrossing of Individuals ' in Chapter IV. of the 

 same work. It was well indeed that Darwin began by 

 publishing the shorter and more manageable abstract ; 

 the half, as the wise Greek proverb shrewdly remarks, 

 is often more than the whole ; and a world that eagerly 

 devoured the first great deliverance of the Darwinian 

 principle, might have stood aghast had it been asked to 

 swallow it piecemeal in such gigantic treatises as those 

 with which its author afterwards sought thrice to van- 

 quish all his foes and thrice to slay the slain. 



