TABLE OF CONTENTS. 



Page 



Preface by the Editor iii 



Chapter I. Introductory 3 



Chapter II. The Problem of the Origin of Species 9 



Chapter III. The Problem of the Origin of Species (continued) 37 



Chapter IV. The Origin and Relationship of Rock-Pigeons as Revealed in their Color-Pattern. ... 49 



Chapter V. The Turtle-dove Pattern in the Piiylogeny of Pigeons 64 



General statement 64 



The turtle-dove pattern in the 1 'nisi cliche 66 



The Turturinse 66 



The Zenaidina- 75 



The Peristerinie 77 



The Geopeliinx 84 



The Phabinae 95 



The Geotrygoninse ' 102 



Chapter VI. The Turtle-dove Pattern in the Phylogeny of Pigeons (continued) 104 



The turtle-dove pattern in the Treronidse 104 



The Treronina; 104 



The Ptilopodina; 104 



The turtle-dove pattern in the Gouridse 105 



The turtle-dove pattern in the Columbidae 105 



Feral Columba 105 



Domestic pigeons 112 



Color and pattern in domestic pigeons, according to Priitz 113 



Black crescentic tips in toy pigeons 115 



Chapter VII. The Turtle-Dove Pattern in Other Orders of Birds 117 



Historical and introductory 117 



Theories of color and pat tern 11' 



Sexual dimorphism in color 120 



The turtle-dove pattern and its modification in various forms 121 



On the evolution of the ocellus of the Argus pheasant and tin' peacock 131 



Further examples of the turtle-dove pattern and its derivatives in birds .134 



Dark centers 134 



Dark centers and transverse bars 134 



Transverse bars '35 



Black crescentic tips and transverse bars 136 



Concentric crescentic bars 138 



Transverse bars in common fowls 138 



Chapter VIII. Funis and Fundamental Bars as Plumage Characters .... 140 



Fluted and frilled wing-feathers 1-10 



Common pigeon and guinea-pigeon 141 



Flutes pass into frills 141 



The association of frills with other evidences nf weakness 142 



The breast-crease and frill "3 



The breast-crease in hybrids from the common pigeon and the Japanese turtle 143 



The breast -crease and frill in other hybrids and in feral species 145 



The breast-crease and frill in common pigeons 14< 



< In frilled or frizzled races of birds 



The pigeon 1 



Fowls I 50 



Geese ' ^ 



Bullfinch • l51 



Frilled feathers as a character of gradual development rather than saltative 151 



Fundamental bars 15- 



Chapter IX. The Mutation Theory and Mutations 15" 



Introductory '" 



The guinea-pigeon mutation *°" 



The Zenaida mutation "" 



On the color of the young of Zenaida and Zenaidura 168 



On the juvenal plumage colors of a " mutant " and normal Zenaida 171 



General considerations 



Chapter X. The Problem of Organic Development — Facts and Theories 177 



The apical mark as an example of recapitulation 182 



vii 



