346 



TUMORS. 



potash, blue-stone, chromic acid, chloride of zinc, and nitric acid, 

 are not especially valuable in the therapeutic treatment of tumors. 



Fig. 75. 



Paquelin's thermo-cautery. 



Removal — Extirpation. This method is the best one to follow 

 in all large tumors which are easily reached. Various modifica- 

 tions are possible, according to the form and location of the tumor, 

 but the following is the general mode of procedure: 



1. The incision: The cut should be made by an ordinary scalpel 

 between the tumor aud soft parts; making the incision, if possible, 

 in the direction of the hair and of the large bloodvessels. 



2. After the extirpation of the tumor the cavity should be cleared 

 of all loose tissue by means of a pair of scissors or scraped with 

 a curette. 



3. Ligate all the bloodvessels. 



4. Tie up, or bring together by means of sutures, the edges of 

 the wound. 



5. Place over the wound an antiseptic dressing. 

 Anaesthesia. We have already given information as regards 



the last three points of the operation. We must confine the 

 animal, in all operations, in such a way as to prevent him from 

 biting or from moving that part of the body which is operated upon. 

 It is best to place a leather strap or bandage around the mouth (see 

 Fig. 76), and have an assistant hold it. This method is preferable 

 to strapping with cord, etc. Berdez, Arnold, and others have con- 

 structed special operating-tables whicli are to be used in hospitals. 

 In very serious operations, accompanied by great pain, it is 

 advisable to place the animal under the influence of some anaes- 



