20S 



INHERITANCE, FERTILITY, AND SEX IN PIGEONS. 



TABLE 189 (continued). 



(first egg, 18 days, nearly. 

 d- Common dove X 9 common dove, period for j egg _ ^ d&a near 



TABLE 190. Summary on period of incubation. 



early. 

 < near)y 



cf Ectopittes X 9 Ectopistes (single egg in clutch), 12j days, nearly. 



/first egg, 15 days + or . 

 <? Ring-dove X 9 ring-dove, period for ......... \eou\ egg, 14 days - or +. 



Crosses of common doves and Ectopistes with ring-doves: 



. , , /first egg, 15 days +. 

 I. <? common doves X 9 ring, period for. . j^^ egg _ H dayg + 



/first egg, 14 days 12 to 20 hours. 

 II . <? Ectoprte* X 9 ring, period for ...... ( secon f e ' gg , 13 days 6 to 20 hours. 



TABLE 191. Crosses of St. humilis with St. risoria; eggs incubated simultaneously. 



(A 15) 



' "I don't think this is quite a typical instance." (The period is usually a little longer for the first egg. EUITOH.) 

 " ( 'omparini! the sei-ond eggs of pairs I and II, the cross (II) gave a period of 13 days plus 6 to 8 hours; the uncrossed 

 pair (I) showed a period of 13 days less 2j to 3j hours. This is a difference of a little less than 12 hours." 



