PHYSIOLCGY OF REPRODUCTION IX DOMESTIC FOWL. 83 



ovulations. The assumption of simultaneity or abnormally 

 close succession of ovulations is necessary to account for the 

 production of a succession of double-yolked eggs or of a double- 

 yolked egg immediately following a long series of normal daily 



10. The double-yolked eggs contain more albumen and have 

 a heavier bhell than single-yolked eggs, and in triple-yolked eggs 

 these parts are heavier than in double-yolked eggs. Yet these 

 parts do not increase in direct proportion to the increase in the 

 weight of yolk. That is, the percentage of albumen and shell 

 is less in double- than in single-yolked eggs and is still smaller in 

 triple-yolked eggs. 



11. The yolks of the multiple-yolked eggs of mature birds 

 are not consistently smaller than the yolks of the normal eggs 

 produced during the same period. 



12. Multiple-yolked eggs are longer in proportion to their 

 : breadth than the normal eggs of the same individual. 



The physiolcgical bearing of these facts is discussed. 



