lO QUATERCENTKNARY STUDIES IN PATHOLOGY 



and stained by different methods so as to establish the structure and the 



identity of the different tissues and organs. 



The following tissues and organs are present in the tumour : — 



Skin and appendages. — A large part of the surface of the tumour is 



covered by skin with fine hairs. Microscopic sections of this show 



a well-developed epidermis with numerous hair follicles and both 



sebaceous and sweat glands. 



The lower part of the tumour is covered by a thin dark red membrane, 



which consists of a stratified epithelium resting on a loose fibrous tissue. 



Immediately under the epithelium are very numerous blood capillaries, 



distended with blood cells, and giving the dark red appearance to this 



part of the tumour. 



Fig. 5- — Abortive heart attached to deformed hard palate of Epignathus. (Natural size.) 



Bo7ie aiid teeth. — The bone mostly forms irregular pieces radiating 

 from the centre of the mass. To the right, one piece of bone can be 

 identified as two fused superior maxillary bones. The palatal and 

 alveolar processes of these bones can be distinctly recognised, and 

 embedded in the alveolar processes are eight well-developed dental sacs 

 containing teeth. 



Month. — In relation with these alveolar processes is an irregular 

 mouth cavity seen on the right aspect of the tumour (Fig. 2). This 



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