140 GENERAL ANATOMY. 



and infiltrations stercoraceous or urinary ones particularly 

 in the fatty tissue, are followed by extensive gangrene. The 

 very small proportion of living parts contained in the adipose 

 tissue may account for these phenomena. Something analogous 

 may be seen in hernia epiploicoe: if considerable masses of 

 epiploon be left externally, this organ becomes gangrenous on 

 its surface, abundance of oil flows from it, and when in conse- 

 quence of this, its volume is considerably reduced, there re- 

 mains a mere red and very vascular mushroom, formed by 

 the cellular tissue intermediate to the fat and by the develop- 

 ment of the vessels. 



Dr. Traill, of Liverpool, in a case of hepatitis, found in the 

 serum of the blood drawn by venesection, a remarkable quan- 

 tity of oil, nearly two parts and a half to the hundred of se- 

 rum. The cysts of the ovary frequently contain fat mixed 

 with hair, and sometimes teeth, but the alteration is in that 

 case very complex, and this is not the place to speak of it. 

 Biliary calculi are sometimes formed of a fatty matter called 

 cholesterine. Stercoraceous matters sometimes, also, contain 

 fatty substances, either intermixed, or in separate masses. 

 Ambergrease is a fatty substance that appears to come from 

 the intestine of the physeter macrocephalus. Certain cysts 

 of the genital organs and some hydroceles occasionally con- 

 tain brilliant particles that are nothing more than cholesterine. 

 This matter is also found, though less frequently, in morbid 

 tissues situated in other regions. The tumours called me- 

 liceris, steatoma and atheroma, which are considered as sub- 

 cutaneous, Chap, iii., contain a certain proportion of fatty 

 matter. 



ARTICLE IT. 

 OF THE MEDULLARY, OR ADIPOSE TISSUE OF THE BONES. 



170. The medullary tissue is a membranous, vascular and 

 vesicular tissue contained within the cavities of the bones. 

 It has received the names of marrow, medullary system, me- 

 dulla, meditullium, by a comparison with the pith of trees. 



