86 PBINOEPLES OF VETEEINABT SUEGEBT 



attack of the toxines, and pysemia follows. These parts' 

 cannot be drained; they are beyond reach, and are to-day 

 best combated by intravenous injection of Crede's soluble 

 silver. 



TUMORS. 



Define a tumor. 



Generally speaking, it is a new growth, neoplasm, -with 

 tendency to persist, without physiological function, of non- 

 inflammatory origin, the anatomical arrangement of its 

 component elements differing from the tissues from which, it 

 springs. 

 Does this definition cover all views on tumors ? 



It does not, as some of the authors also include new 

 growths of inflammatory and infectious origin and cystic 

 enlargements. 



Classify tumors from a clinical standpoint. 

 (1) Benignant ; (2) malignant. 



Outline the characteristics of a benignant tumor. 



Its tissues usually are of the same nature as those from 

 which it springs. It is mobile, usually encapsulated and cir- 

 cumscribed ; it is painless and grows slowly because its blood 

 supply is small ; it displaces but does not infiltrate the 

 adjacent tissues. There is no enlargement of the regional 

 lymph glands — that is, those between the tumor and the 

 venous circulation. It does not affect distant metastasis, and 

 when thoroughly removed does not recur. 



Outline the characteristics of a malignant tumor. 



Its tissues are radically different from its tissues of origin, 



