Alfred Russel Wallace 



tribution of Animals," towards which all his previous 

 thought and writings had tended, and from which, again, 

 came other valuable works leading up to the publication 

 of "Darwinism" (1889). 



It will be remembered that Darwin and Wallace, on 

 their respective returns to England, after many years 

 spent in journeyings by land and sea and in laborious re- 

 search, found the first few months fully occupied in going 

 over their large and varied collections, sorting and arrang- 

 ing with scrupulous care the rare specimens they had taken, 

 and in discovering the right men to name and classify them 

 into correct groups. 



At this point it will be useful to arrange Darwin's 

 writings under three heads, namely : (1) His zoological 

 and geological books, including " The Voyage of the 

 Beagle '' (published in 1839), "Coral Eeef s " (1842), and 

 "Geological Observations on South America" (1846). In 

 this year he also began his work on Barnacles, which 

 was published in 1854; and in addition to the steady 

 work on the " Origin of Species " from 1837 onwards, 

 his observations on " Earthworms," not published until 

 1881, formed a distinct phase of his study during the whole 

 of these years (1839-59). (2) As a natural sequence we 

 have " Variations of Animals and Plants under Domesti- 

 cation " (1868), " The Descent of Man " (1871), and " The 

 Expression of the Emotions" (1872). (3) What may be 

 termed his botanical works, largely influenced by his 

 evolutionary ideas, which include " The Fertilisation of 

 Orchids" (1862), "Movements and Habits of Climbing 

 Plants" (1875), "Insectivorous Plants" (1876), "The 

 Different Forms of Flowers and Plants of the same 

 Species " (1877), and " The Power of Movement in 

 Plants" (1880). 



A different order, equally characteristic, is discovered 



2 



