BULLETIN 245. 



ABSTRACTS OF PAPERS PUBLISHED BY THE STA- 

 TION IN 191 5 BUT NOT INCLUDED IN THE BULLE- 

 TINS. 



A complete list of all the publications issued by and from the 

 Station in 191 5 are given on pages xii to xiv of the introduction 

 to this Report. The following pages contain abstracts of the 

 papers issued during the year that are not included in the Bul- 

 letins or Official Inspections for the year. 



RELATION OF SIMULTANEOUS OVULATION TO 

 THE PRODUCTION OF DOUBLE-YOLKED EGGS*. 



(i) Double-yolked eggs with normal separate yolks may 

 have all the egg envelopes common to the two yolks, or they 

 may have some separate and some common envelopes. 



(2) They -may be classified with reasonable accuracy into 

 three groups : 



Type I. — Double-yolked eggs having the entire set of egg 

 envelopes common to the two yolks. 



Type II. — Double-yolked eggs having separate chalaziferous 

 layers but all or part of the thick albumen common to the two 

 yolks. 



Type III. — Double-yolked eggs in which the yolks have en- 

 tirely separate thick albumen envelopes but a common egg 

 membrane and shell. 



(3) Of the eggs studied 16.03 P^r cent belonged to type 1, 

 70.99 per cent to type II, and 12.98 per cent to type III. 



(4) A large series of double-yolked eggs show all gradations 

 within and between these groups. 



*This is an abstract of a paper by Maynie R. Curtis, having the same 

 title and published in Journal of Agricultural Research, Vol. Ill, pp. 

 375-386. PI. XLVI-LII. 1915. 



