DWARF EGGS OF DOMESTIC FOWL. 



317 



became unable to produce normal eggs on account of a patho- 

 logical condition 18 of the oviduct. (2) In every case the part 

 of the duct affected was the posterior end of the funnel or the 

 anterior end of the albumen secreting region or both. (3) 

 The disturbance in each case was of a nature to constrict or 

 prevent the normal expansion of the lumen of the duct. (4) In 



Date. 



1 

 1 



2 

 j 



3 



1 

 I 

 ■ 1 

 1 



I 



n 

 n 



4 



1 



I 

 I 



I 

 1 

 1 



n 



1 — 



n 



5 



1 

 1 

 x 



1 



1 

 1 



n 

 n 



n 



6 



n 



1 



1 



1 



1 

 1 



n 

 n 

 n 



7 



1 

 1 



1 



n 



1 



n 

 n 



8 



1 

 1 



1 



x 



n 

 n 

 n 



9 



1 

 I 



1 



I 

 1 

 I 



n 

 n 



10 



1 

 1 

 1 

 1 



1 

 n 



n 

 n 

 n 



11 



1 

 1 

 1 



1 

 1 

 1 



n 

 n 

 n 



D 



n 



12 



1 

 1 

 1 



1 



1 

 n 



n 

 n 

 n 

 n 



u 



13 



n 



1 

 1 

 1 

 1 



1 

 1 



n 

 n 

 n 

 n 



n 



14 



1 



1 

 n 



1 



n 

 n 

 n 

 n 



n 



n 



IS 



I 

 I 



1 



•I 

 z 

 1 



n 



D 



n 

 n 



x6 



n 



1 



X 

 X 



1 

 1 



11 



Q 

 B 

 C 



n 



D 



17 



I 



I 



I 



I 

 n 

 n 



n 

 n 



n 



18 



n 



1 

 1 



n 

 n 

 n 



19 



n 



1 



1 

 n 

 1 



1 

 1 

 n 



n 



D 

 D 



n 

 n 



20 



1 

 1 



1 



X 



n 

 n 

 n 

 n 



21 



1 



X 

 X 



1 



X 



I 



n 



n 



1 — 



22 



1 



X 



1 



X 



1 

 1 



n 



n 

 n 



n 



23 



1 

 1 



X 

 X 



n 



X 



1 



n 

 n 

 n 

 n 



24 



1 



X 



1 

 1 

 n 



n 

 n 

 n 



n 



1 — 



25 



n 



1 



X 

 T 

 I 

 n 



X 



n 

 n 



n 



26 



X 

 X 



X 

 X 



I 

 I 



X 



n 



n 



1 — 



27 



X 

 X 

 X 



X 

 X 



n 



n 

 n 



n 



28 



X 



1 

 n 



X 

 X 



1 

 1 



n 



n 



29 



1 

 1 



X 



n 



n 



n 

 n 



n 



30 



X 



1 

 1 

 1 



X 

 X 



11 

 11 



n 



n 



31 



X 



n 



Totals. 



Sept 



Nov 



3 



27 

 25 

 21 

 18 

 13 



19 



18 

 18 





Feb 



Mar 



1 



1 



1 



n 

 n 

 n 



1 



1 

 n 



1 



n 

 n 



107 

 x6a 



July 



1 

 x — 

 

 

 

 3- 

 

 



Sept 

























n 







n 







n 



n 



n 







D 





Feb 





























a " 1 " denotes a normal egg, " i-" a dwarf egg, "n" avisit to the trap nest but no egg, and "D" date 

 killed for data. 



Fig. 56. Egg record of Case No. 1, "1" denotes a normal egg, "1 — " 

 a dwarf egg, and "n" a visit to the trap nest but no egg. 



no case was the passage completely closed. (5) In each case 

 there was convincing evidence that the ovary was in a normal 

 reproductive cycle at the time the dwarf egg was produced. 



Five of the sixteen 19 dwarf eggs produced by these birds 

 contained as a nucleus a small quantity of yolk not enclosed 

 in a vitelline membrane. This yolk was no doubt a part of a 

 normal yolk, the rest of which was absorbed by the visceral 

 peritoneum. Three of the five birds were absorbing yolk in 

 this manner at the time of autopsy. The presence of a part of 



"Four of the five cases had tumorous growths on the walls of the 

 duct. In two cases these involved a large part of the funnel and albu- 

 men secreting region. In the other two the affected tissue was confined 

 to a narrow band in the lower funnel or albumen secreting region. In 

 the fifth case there were two constrictions of the duct in the anterior 

 end of the albumen secreting region. The constrictions were separated 

 by one centimeter of duct with a normal diameter. The tissue in these 

 constrictions did not appear pathological. 



"In two other cases the presence or absence of yolk was not recorded. 



