THE ORIGIN OP SPECIES 



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FIG. 194. A few varieties of domestic Pigeons. Over one hundred and fifty 

 different breeds have been derived by selection from the wild Blue-rock Pigeon, some 

 of which "differ fully as much from each other in external characters as do the most 

 distinct natural genera." (Darwin.) 1, Blue-rock Pigeon, Columba livia, ancestral 

 form; 2, homing; 3, common mongrel; 4, archangel; 5, tumbler; 6, bald-headed 

 tumbler; 7, barb; 8, pouter; 9, Russian trumpeter; 10, fairy swallow; 11, black- 

 winged swallow; 12, fantail; 13, carrier; 14, 15, bluetts; bird between 14 and 15, a 

 tailed turbit. (From photograph of an exhibit in the United States National Museum.) 



