INFLUENCE OF SPERMATOZOA ON HATE OF DEVELOPMENT OF EMBRYO. 207 



TABLE 186. Contemporaneous incubation period in 4 cases. 



Summary: I to III are 3 pairs of common pigeons; IV is a cross of a male ring (alba x rimria)X female homer. Time 

 of IV nearly agrees with II and III; is a little less for their first eggs; it, is considerably less than first of I. I, II, and III 

 agree on second eggs; the first egg has longer time, probably due to lighter sitting for first two days. (A 15) 



1 The figure given here, 7 1 ' 05"', is almost certainly wrong: the correct time was almost certainly 2 1 ' 05 m . If this is true 

 the incubation time for this egg is 5 hours longer than indicated by the calculation given above; i.e., it was 17 days plus 

 15 to 10 hours. KUITOK. 



TABLK 187. Normal incubation lime of Eclopistea migratoriiis (4 pairs). 



1 Clutches of only 1 egg each are laid by this species. EDITOU. 



TABLE 188. Incubation period of <? passenger X 9 ring hybrid (alba-risoria x risoria-allia, C 1). 



TABLE 189. Incubation period for d* Ectopistes (I A) X 9 ring-dove (L 2). 



