PHYSIOLOGY OF THE OVIDUCT 103 
Autopsy No. 3870. Hen No. 952. March 19, 1910 
Egg found in the albumen portion of the oviduct 11 em. in 
front of the cranial end of the isthmus. This egg consisted of 
a yolk surrounded by thick albumen (layer C) but with no trace 
whatever of the albumen layer D. Not yet having entered the 
isthmus the egg lacked a shell membrane. 
Autopsy No. 332. Hen No. 420. December 22, 1909 
This case was similar to that just cited. Here an egg was in 
the albumen portion of the duct with its caudal end 6 cm. in 
front of the cranial end of the isthmus. The egg consisted of 
yolk surrounded by dense albumen (layer C). There was no 
trace of the thin albumen (layer D) to be observed. The egg had 
no shell membrane. 
Autopsy No. 366. Hen No. 276. March 18, 1910 
Egg in albumen portion of oviduct with its caudal end 4 cm. 
in front of the cranial end of the isthmus. This egg had no shell 
membrane. The yolk was surrounded by thick albumen (layer 
C). ‘The egg bore no trace of the thin albumen (layer D), even 
though it was only this short distance (4 em.) from the point 
where the ‘albumen secreting’ portion of the duct was finally 
to be left. 
Autopsy No. 301. Hen No. E39. July 14, 1909 
When this bird was killed an egg was found at the lower end of 
the albumen portion of the oviduct just about to enter the isthmus. 
Not yet having entered the isthmus the egg had no shell membrane 
upon it. It consisted merely of a yolk surrounded by albumen. 
The outermost layer of this albumen was dense and corresponded 
to layer C described above. There was no trace of thin albumen 
(layer D) on this egg although it was just on the point of leaving 
the so-called albumen region of the oviduct. 
