itself and varying greatly in thickness according to the 

 size of the whole tumour. In small growths, the layer is 

 thin but in those of one or more inches in diameter, it is 

 exceptionally hard and thick, and may form bosses and 

 irregularities quite apart from the shape of the worm in its 



Microscopic Appearances.— Sections of the outer fibrous 

 wall show that it consists of dense fibrous tissue containing 

 a variable number of blood vessels and cells varying in 

 numbers in different parts. In some places are scattered 

 leucocytes with numerous eosinophile granules. These 

 may be dispersed singly or form columns between the 

 fibrous tissue or be collected into considerable masses in a 

 little fibrous stroma. Such cells constitute by far the 

 majority of those met with in sections of the wall, ordinary 

 polymorphonuclear leucocytes with few or no granules not 

 being noticed. In addition to these cells are varying 

 numbers of connective tissue cells and also in the fibrous 

 stroma itself branching cells with basophile granules— the 

 mast cells of the tissues. 



Degeneration, Injuries, etc.-Occasionally, in the outer 

 layers of the fibrous capsule, a considerable amount of dark 

 venous extravasated blood is found apparently the result 

 of direct injuries received during the last days of the 

 animal's life, to which the prominence of the tumours 

 render them especially liable. This blood rarely extends 

 beyond the outer layers of the capsule. In instances where 

 the injury is older, the nests become yellowish and degener- 

 ated, probably from cutting off of the blood supply. 



A remarkable instance of a foreign body embedded in a 

 tumour was found in one case whilst cutting sections. 

 Buried about half-way through the outer capsule, was found 

 a small fragment of woody or at least vegetable tissue 

 showing portion of a vascular bundle, and leading obliquely 



