100 RAYMOND PEARL AND MAYNIE R. CURTIS 
Fig. 1 Photograph of a hen’s oviduct which has been removed, slit longitudi 
nally throughout its length and opened out flat in order to show the gross anatomy. 
In order to get the whole duct on the photographic plate it was necessary to tran- 
sect it at about the middle. A, the infundibulum. Note muscle fibers in wall 
and absence of any extensive gland development. 8, albumen secreting portion; 
note heavy glandular development. The albumen portion ends and the isthmus 
begins at z. The line of demarcation is very distinct in the freshly prepared ovi- 
duct. C, the isthmus. D, the uterus orshell gland. E, the vagina; about one- 
third natural size. 
