Viii TABLE OF CONTENTS. 



PAGE 



Chapter XI. Blond and White Ring-doves Crossed with Mourning-doves, Common Pigeons, and 



THE European Turtle-dove 123 



General statement 123 



Blond and white rings crossed with the mourning-dove and its hybrids 123 



Blond and white rings crossed with common pigeons 129 



Archangel X ring 131 



Admista X ring 131 



Fantail X ring 131 



Tumbler X ring 132 



Homer X ring 133 



Blond and white rings crossed will, ilir Iliiii'iiean turtle-dove and its complex hybrids. . 13S 



Se.x-ratio in crosses of families, suMmiiuIh -, .iiid genera 142 



Chapter XII. Sex-limited Heredity in Crossks Iw ..i,\ i\.. Blond and White Ring-doves and Related 



Species 143 



General statement 143 



Crosses of blond and white ring-doves 143 



Blond rings and blond-white hybrids crossed with Japanese rings 147 



Blond and white rings crossed with red rings 149 



Crosses involving the Surate turtle-dove, and blond, white, and red ring-doves 155 



Chapter XIII. Other Pigeon Hybrids, and the Breeding of Several Pure Species of Doves and 



Pigeons 1'52 



General statement 162 



Several crosses of doves 162 



S,,„f,„l,n,is :< atha 162 



,S'( III ijiili iims •■. rinoria 163 



Miijriiliirnia ,-. lisoria and alba-risoria hybrids 165 



Miyralorius X tdba 165 



Miscellaneous crosses 165 



The sex-ratio and width of cross 166 



Breodinj; ilnta ujion pure-bred pigeons and doves 168 



Siiili,,., Ill, suralrnsis 168 



l'hll|<^^< rlinliniilrm 168 



Stnplopclia rixoria 1"0 



Sex and egg of clutch 171 



Chapter XIV. On the Nature and Basis op Heredity 177 



Hereditv 177 



On MrlHlrll.ill Im irdity 180 



Wi.-:iK ;;( I HIS iiid ii regularities in development 183 



Physical weakness 184 



Weakness in common pigeons 185 



Short, abnormal legs 185 



Distorted development — wry neck — dolicocephalism 185 



Wry-neck — complete lack of co-ordination of head and limbs 186 



Cross-bill 186 



Infertilitv 186 



Early fcidlilv is ,.flri; rnllowcd l.v liiln- infn-l ilily 187 



Chapter XV. Descuiptive ami llisionh \i. u\ mi; S^>n,\T \ iic I'n^iTioN of Certain Ring-doves 189 



The blond riiij;-.l,,vr i.s/,, ,,/„/„/,„ n^„nn\ 189 



Brissoii on I lie i oll.ncd turtle-dove 190 



Temniinciv on ll,r l.lon.l ring-dove 190 



Linne on ( ■.ilinul.., n.nria 193 



Selby on Tiuliii- n.nmis 193 



The white rin'-.l.u ,■ Sir, iilopelia alba 194 



Temmin,! - ,1. -n ,,,| ,on 194 



Boitard ami < 'orlm-s description 195 



The Japanese ring-dove {Slreptopelia douraca) 197 



Recent descriptions of ring-doves 199 



Chapter XVI. Influence of the Spermatazoa of Pigeons on R.vpe op Development of Embryo 201 



Chapter XVII. On the Divisibility of Characters 209 



