62 INHERITANCE, FERTILITY, AND SEX IN PIGEONS. 



Condensed and consecutive record oj matings made to test fertility of offspring of this family." 



cT 452. 5/10/11-5/10/13; 24 mo. 



When a year old this male placed with St. alba 409 (also one year old) which had just laid (while unmated) 

 her first clutch of eggs. These birds remained together until September 3, 1912, without mating. Female 409 

 died November 15, 1912. After September 3, 1912, 452 was placed with T. orientalis (2) then at least 15 years 

 old; no result ( 9 2 died November 17, 1912). During the succeeding winter (and spring) of 1912-13 this male 

 was with several T. orientalis (including 9 475) of similar age but without result. 



<? 446. 5/16/11-2/21/13; 21 mo. 



When 1 year old (June 25, 1912) put with St. alba female 414 (then nearly 1 year old). Five eggs produced, 

 all infertile; this, with a female that tested very fertile earlier, and also later, in the same season, with T. orien- 

 talis 101 and with Si. alba 26, as is fully shown in table 35. 



<? 412. 6/11/11-3/25/13; 21j mo. 



When a year old was placed for a time probably the whole summer with female 48 1 of this series without 

 result. During the winter of 1912-13 (till death) was with a group of T. orientalis, probably without securing 

 a mate. 



9 500. 6/11/11; alive 10/1/14; 40+ mo. 



The very considerable data on this bird will not be presented here in full, nor in tabular form (it would 

 require three full-page tables), since these must be presented in a work of our own (O. R.) soon to be published, 

 in which chemical and other aspects of the ova are studied in much detail. To March 20, 1915, she had hatched 

 59 young, and only 9 infertile eggs have been found. More than 100 eggs have been produced. Nearly all 

 her young are still alive. 



9481. 6/25/11; alive 10/1/14; 40+ mo. 



The complete record of this bird is given in table 29. 



9433. 7/18/11-11/27/13; 28 mo. 



This record is completely given in table 20. 



9 489. 7/16/11-3/28/13; 20 mo. 20 da. 



When 1 year old this bird was put, for about 6 months, with T. orientalis 481; probably with no result. 

 It was at first thought that these birds were mated (in general pen) before being given a separate cage, and 

 thought too that 489 had laid an egg; this probably wrong. From November 1912, till death, March 28, 1913, 

 with several T. orientalis males without result. This bird was therefore by no means the equal of her sisters 

 500 and 433 in fecundity nor in desire to mate. 



? a 1 440. 7/26/11; disappeared 10/24/12-12/1/12; 10+ mo. 



The short mating history of this male is presented in table 34. Sex known only from behavior. 



?cf 424. 7/26/11; disappeared before 5/1/12; 10+ mo. 



428. 8/6/11; escaped before 12/1/12; 10+ mo. 



For 4 months (after a year old) this bird had opportunity to mate with both male and female T. orientalis 

 without doing so. Its escape prevented the ascertainment of its sex. 



9429. 8/8/11; alive 1/1/15; 41+ mo. 



During summer, autumn, and winter of 1912 with two brothers 412 (until January) and 488 without 

 eggs and with no indications of mating. On May 7, 1913 (mated to St. alba 072) she began laying eggs, nearly 

 all of which were infertile; during the following year laid mostly clutches of one egg each (infertile); breeding 

 record in table 30. 



c?464. 8/14/11; alive 10/1/14; 38+ mo. 



When a year old this bird was kept for about G months with a sister female 430 without result. St. alba 

 female 892 was given April 30, 1913. Table 33 supplies the details of this infertile union, and later failure to 

 mate. 

 444. 8/16/11; disappeared before 12/1/12; 16 mo. 



This bird was kept with some of its brothers and sisters without mating. Its escape left the question of 

 its sex undetermined. 



9454. 8/22/11-3/24/13; 19 mo. 



Like the preceding, this bird remained with the other sex of its own species without mating. 



9475. 9/1/11-3/23/13; 18 mo. 22 da. 



This bird was kept with its older brother, 452, from early November 1912 till time of death, with no indi- 

 cation of mating. 



cT 421. 9/15/11-1/1/15; 39^ mo. 



The full history is given in table 31. The sex-glands abnormal; probably a single testicle. 



c? 488. 9/15/11-4/23/13; 19 mo. 



This bird kept with some of its sisters during its whole life; it did not mate. 



9436. 9/26/11-4/5/13; 18 mo. 



During the 6 months preceding its death, female 436 was kept with its brother 464 without result. 



9423. 9/28/11-2/21/13; 17 mo. 



This bird, the last hatched of the series, was continuously with one or more of its brothers without having 

 mated or laid eggs. 



11 The birds are here listed in the order of hatching. 



