148 INHERITANCE, FERTILITY, AND SEX IN PIGEONS. 



mental strength" of these germs is here obviously higher than in those from pair I. 

 In this second pair we get failure to complete the development in only the first 

 clutch, and two "very light colored" birds (no whites) only from the last clutch of 

 the season. It will be noted that pair I produced one more clutch of eggs than did 

 II. From i^air I — the "weaker" series — were produced 2 males and 3 females, the 

 sexes being of both colors. From ])air II — the "stronger" series — 2 males and 2 

 females arc known; the light-colored young ai'e of both sexes. The sex of all the 

 dark birds is unknown. 



Besides the association of sex and color in inheritance already noted in this 

 cross, or group of crosses, it may be further remarked that the tables indicate a 

 high degree of fertility, and coincidentally a fairly long term of life of the 

 offspring. Inbreeding (table 137) i:)robably introduced a reduction of both fertility 

 and longevity. 



Table 134. 



Pair 1. 



c? St. risoria (5) ; age unknown. 



9 St. douraca (O); 12/30/02. 



9A1. 7/19/01 light, nearly color of risoria dead 3/1 1/O.J 44 mo. 



d'K 2. 7/21/01 decidedly dark (douraca) dead 1/13/04 30 mo. 



cf B 1. 4/6/02 complexion dark; ad. color pale brownish 9/6/04 29 mo. 



B 2. 4/8/02 complexion light; ad. color pale brownish. 



9 CI. 5/12 



d'Dl. 6/29 complexion dark alive 4/9/03; fertile. 



cf'D2. 7/1 complexion dark dead 9/22/02 (trip). 



cT St. douraca; alive S/3/03. 

 9 St. risoria (C) ; alive 8/3/03. 



9 A 1. 4/10/02 dark, like reciprocal dark birds dead 11/5/02 7 mo. 



o''A2. 4/12/02 dark dead 11/28/02 7i mo 



9B 1. 5/13 quite dark dead 4/10/04 23 mo. 



B2. 5/15 quite dark. 



9 CI. 6/24 dark color dead 12/28/04 30 mo. 



C 2. 6/26 complexion dark. 



D. 8/1 color ? probably died early. 



cTE 1. 10/1 nearly as light as risoria dead 1/24/04 . . . . 



E 2. 10/3 nearly as light as risoria dead very young . 



cT risoria-douraca (A 2) : very dark; 7/21/01; 1/13/04; 2 yr. 6 mo 

 9 St. risoria (from 1901); isabelline; alive 1903; 2+ yr. 



(fA 1. 4/21/02 hatched, complexion dark; ad. like risoria dead 10/20/04. 



9 A 2. 4/23/02 hatched, complexion not as dark as A 1 (fertile) ?. 



B 1. 5/5 hatched, color light. 



B 2. 5/7 hatched, complexion linht dead 7/5/02. . . 



; (fertile). U. ID 17; no record. 



1 dead 5/22/0 



cTFl. 2/22/03 hatched, light ,I.:mI 'i 'i lis 5 yr. 7 mo. 



9F2. 2/24/03 hatched, dark .!.;,. I 7 .. iC. 2 yr. 5 mo. 



gGl. 7/201 o light ffertilc)- other d.irk M.^hMii I'idl 1 yr. 3 mo. 



^ G 2. 7/22 r""^' ^ '"^'" (Itrtilc) , other, dark .^^^^^ ^.^^,^. ^.,j ^j ^^^ 



H 1. 9/12; broken. 



H2. 9/14 hatched, com|ilexion dark dead 11/14/04 1 



