PHYSIOLOGY OF REPRODUCTION IN DOMESTIC FOWL. 73 



The third triple-yolked egg was produced Oct. 8, 1913, by 

 bird No. i6K. It was her sixth egg. The dimensions were as 



follows: 



Length 65.2 mm. 



Breadth 46.2 mm. 

 Weight 7741 gms. 



The egg was opened and the three yolko were seen lying in 

 practically the same position as those in the triple-yolked egg of 

 65K. In an attempt to get a photograph of this egg the edge 

 of the shell was accidently pressed against two of the yolks and 

 yolk flowed out into the albumen. The yolk which was not 

 broken and the thell were weighed. More data could not be 

 accurately obtained but on the assumption thai the yolk saved 

 represented a mean of the thiee yolks the data for this egg aie as 



follows. (The calculated data are in italics.) 



* 



Weight of yolk = 10.29 X 3 = 30.87 gms. Percentage of yolk 30.88 



W r eight of albumen = 30.17 gms. Percentage of albumen. . 50.60 

 Weight of shell = 7.37 gms. Percentage of shell 9.52 



THE SIZE AND PROPORTION OF PARTS IN THE SINGLE-, DOUBLE- 

 AND TRIPLE-YOLKED EGGS OF THE SAME INDIVIDUAL. 



On September 28 and 29 the bird 6sK which had laid the second 

 triple-yolked egg laid normal single-yblked eggs. These eggs 

 were not preserved. On October 2 she laid a double-yolked egg. 

 Complete data were taken on this egg. 



It was apparent that this bird's eggs offered an excellent 

 opportunity to study the proportion of the parts in multiple eggs 

 when compared with normal eggs produced by the same indi- 

 vidual. Accordingly data were taken on the next ten normal 

 eggs. On October 6 the bird produced another double-yolked 

 egg. This was her seventh egg. Both of the double-yolked 

 eggs of this bird had separate chalazal membranes but a common 

 thick albumen envelope. 



The data on the triple- and double-yolked eggs and the mean 

 for the ten normal eggs are given in Table II. 



The data given in this table show that the double-yolked eggs 

 of this bird are not twice, nor the triple-yolked eggs three times, 

 the size of the normal single-yolked eggs. Thij agrees with 



