106 Mr. F. Du Cane Godman on the Birds of the Azores. 



stant and violent storms, which blow from all points of the 

 compass, while the latter enjoy almost uninterrupted calms 

 (Darwin's 'Origin of Species/ p. 433). Currents flow in 

 varying directions round the Azores, being apparently influ- 

 enced by the prevailing winds, while those of the Galapagos are 

 strong and unvarying. The results are apparent. The storms 

 which surround the Azores not only maintain, as it were, a cir- 

 culation of the established species, but constantly bring a fresh 

 stock from the dififerent sources of supply. On the other hand, 

 the calm weather and strong currents of the Galapagos not only 

 sustain the isolation of that group from the continent of South 

 America, but even almost preclude the existence of intercom- 

 munication among the islands in sight of each other. 



Subjoined is a comparative list, showing the distribution of 

 birds throughout the three groups of islands forming the archi- 

 pelago of the Azores as I have previously defined them : — 



Table showing the distribution of birds in the Azores *, 



* The dagger (t) prefixed before the name of a species signifies that it is 

 a straggler, and not a resident. The names of places in the last column 

 in italics signify that the appearance of the species there can only be con- 

 sidered occasional. With regard to this list, I should mention that six 

 species included in the Central group I saw in a collection made by a gen- 

 tleman in Terceira ; therefore, in order to arrive at the correct proportion, 

 these should be subtracted, and the numbers would then stand : — Eastern 

 Group, 40 ; Central, 36 ; Western, 29. 



