MUTATION, FERTILITY, AND LONGEVITY IN INBRED JAPANESE TURTLE-DOVES. 51 



strongest of a weak progeny (table 18a), produced inbred offspring from 2 different 

 males (uncles) during 3 years — her second, third, and fourth years. The number 

 of eggs, offspring, and the data for sex and longevity from these three years (tables 

 26, 27, 26a) is as follows: 



1910 (cf76), 10 eggs, 10 tested, 8 hatched, Icf, 2 9, 5? (? 8 months). 



1911 (d'ye), 30 eggs, 25 tested, 25 hatched, 70^, 9 9,9? (26+ months). 



1912 (cf 40), 10 eggs, 2 tested, 2 hatched, OcT, 19,1? (3^ months). 



It is obvious, therefore, that, in the inbreeding of uncle and niece, among 

 Japanese turtle-doves, a long-lived progeny is difficult to obtain. The results are, 

 however, more favorable than were obtained in the brother-and-sister matings. 

 They are at the same time less favorable than the out-crosses with Streptopelia. 

 These several matings all disclose the weakness of the last germs of the season. 



The large family produced in the uncle-and-niece mating of 1911, whose origin 

 in detail is given in table 27, becomes, in the next chapter, the subject of a further 

 study on the relation of "season of hatching" to "fertility." 



cT 108 "Mutant" T. orientalis; "much white" 9/7/10 3,8/13; 30 mo. 1 da. (see pi. 7). 



9 433 Normal (?)T. orientalis; 7/18/11 11/27/13; 28 mo. 9 da. (see pi. 7). 



The parents are both inbreds, and are related (see sketch of this, page 42). 

 AAl. 3/19/12; ? deserted. 

 AA 2. 3/21/12; ? deserted. 



A 1. 4/1; no development. C 1. 4/28; no development. 



A 2. 4/3; no development. C 2. 4/30; no development. 



B 1. 4/19; not tested. D 1. 5/8; trace development. 



B 2. 4/21; soft shell. D 2. 5/10; 4 to 5 day embryo. 



9 El. 5/30 normal 895 dead 9/18/12 3 mo. 18 da. 



cfEZ. 6/1 '. normal 885 dead 7/19/12 1 mo. 18 da. 



F 1. 6/8; not tested (analysis). 

 F2. 6/10; not tested (analysis). 



cfGl. 6/18 normal 826 dead 3/1/13 8 mo. 12 da. (see pi. 7) 



G2. 6/20; trace, or no development. 



H 1. 6/27 normal 818 disappeared (probably dead) at 9 or 10 mo. 



H2. 6/29; failed to hatch. 

 I 1. 7/6; 13 day embryo (irregular incubation). 



9 12. 7/8 normal 891 dead 4/13/13 9 mo. 5 da. (see pi. 7) 



cf J 1. 7/14 white tail 879 dead 4/2/13 8 mo. 19 da. (see pi. 7) 



9 J 2. 7/16 normal 880 dead 4/20/13 9 mo. 4 da. (see pi. 7) 



K 1. 7/24; on ground, broken. 



K 2. 7/26 hatched 8/10 dead 8/12/12 17 da. 



9 LI. 8/l\one white tail + 861 dead 3/17/13 7 mo. 17 da. (see pi. 7) 



9 L2. 8/3/other white tail + 874 dead 4/9/13 8 mo. 6 da. (see pi. 7) 



, , , M 1. 8/12\one much white ' S59c? dead 3/26/13 7 mo. 14 da. (see pi. 7) 



a ana . ^^^ 8/14/other much white- 801 (?) dead 12/13/12 4 mo. (see pi. 7) 



In 1913 this female refused to mate with male T. orientalis (69). She died from exposure (was nearly 

 naked) on trip — Chicago to New York — more than 15 months after the close of the above record. From 

 9/30 to 11/26/13 she was with a St. alba {6'%~2) without mating (could not gain perch). (0. R.) 



' Also club feet, defective feathering. 



' Also club feet, defective feathering, and only one kidney. 



Table 21. 



d' T. orientalis (2 2) ; 9/20/03; brother; 6/19 06; (one blind eye); 33 mo. 



9 T. orientalis (21); 9/18/03: sister; 7/12/08; (has bad eye); 58+ mo. 

 A 1. 4/1/05; some development. 

 A 2. 4/3/05; some development. 



B 1. 6/27 50 dead 8/26, 05 2 mo. 



B 2. 6/29; pricked shell, unable to hatch. 



