I said that ' all the years invent; 

 Each month is various to present 

 The world with some development.'" 



Tennyson's ' Tivo Voices.' 



" Not only does the marvellous structure of each organised being involve the 

 whole past history of the earth, but such apparently unimportant facts as the presence 

 of certain tyi^es of plants or animals in one island rather than in another, are now 

 shown to be de^iendent on the long series of past geological changes — on those 

 marvellous astronomical revolutions which cause a jJeriodic variation of terrestrial 

 climates, and on the endlessly varied actions and reactions of organised beings on 

 each other. . . . We are thus encouraged to study more completely every detail and 

 every anomaly in the distribution of living things, in firm conviction that by so doing 

 we shall obtain a fuller and clearer insight into the course of nature." 



Alfred Russel Wallace, in ■ Island Life' 



