110 ABNORMAL CONDITIONS OF THE OVA OF BIRDS. 



way one egg becomes included in another. Very frequently the 

 included egg is cracked or broken ; in such cases impaction is 

 probably the cause of the phenomenon. 



473. The shell of a normal Hen's egg, enclosed in a larger very 



thin shell. The inner shell is cracked, and appears 

 to have been cracked within the oviduct. The space 

 between the outer and inner shells probably contained 

 albumen only, poured out under the irritation of the 

 cracked and impacted egg. 



474. A similar specimen. 



475. A smaller egg-shell included within a larger one ; both 



shells are perfect. An opening has been made in the outer 

 one. Presented by Dr. Birch) 1857. 



476. The shell of a Goose's egg, containing that of a second 



egg ; both shells were perfect : the outer shell has been 

 fractured. Presented by Dr. Leach. 



477. A small well-formed pseudo-egg, which was found within 



another egg. Hunterian. 



e. Fibrinous masses from the Oviduct. 



When an egg is broken or otherwise impacted in the oviduct, 

 it may become surrounded by fibrinous layers, and these often 

 form a mass of very large size. 



478. An immense fibrinous mass, containing a broken egg, from 



the oviduct of a Hen. A section has been made to show 

 the composition of the tumour. 



Presented by W. B. Tegetmeier, Esq., 1871. 



479. A section of a similar fibrinous mass, containing a broken 



egg. Presented by W. B. Tegetmeier, Esq., 1871. 



