INFLUENCE OF SPERMATOZOA ON RATE OF DEVELOPMENT OF EMBRYO. 203 



a certain number of hours. The male has not very much prolonged the period of 

 incubation, but before I can say he has not affected it I have to consider the facts to 

 be learned from the reciprocal cross, from crosses made simultaneously, if possible, 

 and from crosses of still other species. 



Table 180. — Incuhalion -period of cf archangel (Ar I) x 9 ring-doves {D 1 and D S). 



4'' 00" to 4'' SO" p.m. Feb. 18, 1897. 



9'' 29" a.m. Feb. 20, 1897 



4'' 55°> p.m. Mar. 14 



lO"" 30" a.m. Mar. 17 



S*" 18" p.m. Apr. 6 



a.m. Apr. 8 



6>' 12" p.m. Apr. 29 

 a.m. May 1 



5'>26" p.m. May 11. 

 S"- 45" a.m. May 13. 



11 to 12 a.m. Mar. 

 Thin shell 



No development 

 Developed, died. 



No development . 

 No development . 



S"" 27" p.m. June 6 



S"" 57" a.m. June 8 



S"" 37" p.m. June 26 



g"" 11" a.m. June 28 



5 to 6 p.m. July 12 1 1 



a.m. July 14 [^o development 



>No development. 

 >No development. 



>No development. 

 >No development . 



■37" 



5'" 34" p.m. Aug. 29. 

 S"- 50" a.m. Aug. 31. 

 3'' 47" p 

 a.m. Jan. 30, 

 p.m. Feb. 19. 



, Jan. 



9 to 1 p.m. Aua. 18. 

 Pricked shell, failed. 



>No development. 



Developed, died. . 

 No development. 



Pricked shell, failed. 



B 2 I a.m. Feb. 21 No development. 



15 das. 19 to 20 hrs. 



Not tested. \ 



15 das. 16 to 20 



Interval, 1 da. 17 hrs. 29 n 

 nearly. 



Interval, 1 da. 17 hrs. 35 n 



(Interval not certain; C 

 laid 5 days after removal 

 of eggs. 



D 1 laid 5 days after re 

 moval of eggs. 



E 1 laid 6 days after re 

 moval of eggs. Interval 

 1 da. 15 hrs. 19 m. 



Interval, 1 da. 15 hrs. 30 m 



Interval, 1 da. 15 hrs. 34 m 



Interval, 1 da. 14 hrs. 49 m. 



Interval, 1 da. 15 hrs. 16 m 

 Eggs by second 9 (D 2). 



Eggs by second 9 (D 2). 



(A 15) 



Summary: Time, Feb. 18, 1897, to Mar. 1898. Of 24 eggs, 2 hatched, fertilized; none reared. 

 ' Some data referred to in various chapters of Vol. Ill are presented in connection with this and succeeding tables. 

 Editor. 



Table 181. — Incubation period of cT black Japanese tumbler (T 3) X 9 ring-dooe (L. 1). 



liggs. 



5 p.m. July 23, 1897 



7 to 9 a.m. July 25, 1897. 



4 to 6 p.m. Aug. 25. 



8 a.m. Aug. 27 



p.m. Sept. 26 



a.m. Sept. 28. 



■Tin 



at noted; about Oct. 9. 



4'" 08" p.m. Oct. 21.. 



a.m. Oct. 23 



Si-Se" p.m. Dec. 13. 

 8 to 9 a.m. Dec. 15.. 



Hatched. 



Incubation 



No development. 



1 to 2 p.m. Aug. S 



5 to 6 a.m. Sept. 10 



Developed, did not hatch. 

 Lost. 



No development. 



12 noon, Sat., Nov. G. .. 



No development. 



7 a.m. Dec. 30 



6 a.m. Dec. 30 



12 to 1 Mar. 7 



Pricked shell, failed. 



i das. 15 

 : das. 21 



.7 hrs. 

 14 hrs. 



hrs.i 



to 22 hrs. 



14 das. 20 to 22 hrs. 



15 das. 19 to 20 hrs. 



Summary: Time, July 1897, to March 1898; 16 eggs; reared 5, hatched 7, 10 fertilized. (A 15; 



'Hatched only with help and soon died; the hatching was abnormally delayed, perhaps from imperfect development. 



