APPENDIX. 



[The full text of a part of Mr. Darwin's chapter on 

 Instinct written for the " Origin of Species," but afterwards 

 suppressed for the sake of condensation.] 



Migration. — The migration of young birds across broad 

 tracts of the sea, and the migration of young salmon from 

 fresh into salt water, and the return of both to their birth- 

 places, have often been justly advanced as surprising in- 

 stincts. "With respect to the two main points which concern 

 ns, we have, firstly, in different breeds of birds a perfect 

 series from those which occasionally or regularly shift their 

 quarters within the same country to those which periodically 

 pass to far distant countries, traversing, often by night, the 

 open sea over spaces of from 240 to !■!<)() miles, aa from the 

 north-eastern shores of Britain to Southern Scandinavia. 

 Secondly, in regard to the variability of the migratory 



instinct, the very same species often migrates in one country 

 and is stationary in another; or different individuals of the 

 same species in the same country are migratory or stationary, 

 and these can sometimes be distinguished from one another 



by Blight differences. 4 Dr. Andrew Smith has often re- 

 marked to me how inveterate is the instinct of migration in 



some quadrupeds of S. Africa, notwithstanding the persecu- 

 tion to which they an; in consequence subjected : in N. 

 America, however, persecution has driven the Buffalo within 



• Mr Qould inis obserred ilii-* Eaci In Malta, and in Tasmania in tli» 

 southern hemisphere. Bechstein (8tubene6gel, [840, - 298) sayi thai in 

 German) the migrator] and non migraton Thrushes can be distinguished bj 

 the yellow tinge •■! the soles of their feet, The 1,'imil [i migrator] in 

 B. A:,,... but itationarj in Rohin Island, onli two Leagues from the oon« 

 tineol ( /,< lititliint' m Travtlt, roL i, p. 106) i Dr. Andrew Smith oonllnna 

 tint. In Ireland the Quail has latelj taken to remain in cumbers t<> breed 

 there (W. Thompson, Nat. lint. <■/ /V«/.//i</, md* " Birds," rol. Li, p. 7"). 



