Lyiiipliaiigioiiia ; Sarcoma. 365 



costal, pulmonary and pericardial pleura of a horse there were found 

 numerous superficial, vesicular growths from the size of a pin's head 

 to that of a nut or pigeon's egg, some with broad surface, others 

 pedunculated, exuding a serous fluid on section from the spongy 

 tissue. Microscopically, they consisted of a loculatcd connective 

 tissue framework, the spaces lined with endothelium and containing 

 scattered l\niph cells. The growth was entirely local, the lymph 

 glands not afifected. 



Schindelka observed in a cat as an anomah', perhaps of tlii^ same 

 categorj', a number of tumors about all the nipples, ranging in size from 

 that of a hazel nut to that of a hen's egg. encircling the nipples and hang- 

 ing loosely, filled with fluid and fluctuating like a leather bottle when 

 handled ; firm lymph cords, of the thickness of the little finger and varicose, 

 branched out from these formations into the skin. 



Now and dien large, tortuous lymph vessels filled with lymph are found 

 in the horse in the heart or mesentery, which are, however, merely lymph- 

 angiectases. 



Sarcomata. 



The name sarcoma (o-dp^. Hesh; fleshy ttimor, from its similarity 

 to proud flesh or exuberant granulation tissue) was applied by \'ir- 

 chow to those connective tissue tumors which do not possess the 

 definitive characteristics of a fibroma, chondroma, lipoma, etc., that 

 is, which are not composed entirely of matttre fibrous tissue, carti- 

 lage, bone, etc.. btit throughout their continuous growth are made 

 up of cells of the connective tissue group persisting in their embry- 

 onic characters. They are new growths whose tissue shows no 

 tendency to maturation and is composed principally just as in 

 embryonic life of undifterentiatcd mesoblastic cells and scanty in- 

 tercellular substance, and whicli are distinguished from the simple 

 connective tissue tumors particularly b\- thc'r malignant character, 

 their rapid and destructive growth, their tendency to recurrence 

 after removal and their formation of metastases. 



The sarcomata are classified from two standpoints : first, from 

 the predominating t\pe of the cells of the growth ; and second, 

 from the admixture of mature tissue with the embryonic cells. 



Many sarcomata are characterized by a special predominating 

 tvpe of cell ; and although the shape of a cell does not alone deter- 

 mine the character of a tumor, the tissues of origin and the nature of 

 growth being also taken into consideration, it gives the microscopic 

 picture of a tumor an individuality of importance in nomenclature, 

 and characteristic because of the deficiency of fully mattered types oi 



