INTRAPERITONEAL INJECTION. 129 



needle being inserted, the requisite dose is administered. 

 The wound is then sealed with a little collodion. 



3. Intraperitoneal Injection. This is best performed by 

 means of a special form of needle. The needle is curved, 

 and has its opening not at the point, but in the side 

 in the middle of the arch (Fig. 43). The hair over 

 the lower part of the abdomen is cut, 



and the skin purified with an antiseptic. 

 The whole thickness of the abdominal walls 

 is then pinched up by an assistant, between 

 the forefingers and thumbs of the two hands. 

 The needle is then plunged through the 

 fold thus formed. The result is that the 

 hole in the side of the needle is within 

 the abdominal cavity, and the inoculation 

 can thus be made. Intraperitoneal inocu- 

 lation can also be practised with an or- ^^ 

 ,. r- f , FIG. 43. Hol- 



dmary needle. Ihe mode of procedure low nee die with 



is similar, but after the needle is plunged lateral aperture 



through the abdominal fold, it is partially ( at . rt ) f r . intra ' 

 . , , ... . . ' . , - J peritoneal inocu- 



withdrawn till the point is felt to be free i at ions. 

 in the peritoneal cavity when the in- 

 jection is made. There is little risk of injuring the 

 intestines by either method. 



4. Intravenous Injection. The vein most usually chosen 

 is one of the auricular veins. The part has the hair removed, 

 the skin is purified, and the vein made prominent by 

 pressing on it between the point of inoculation and the 

 heart. The needle is then plunged into the vein and the 

 fluid injected. That it has perforated the vessel will be 

 shown by the escape of a little blood ; and that the injec- 

 tion has taken place into the lumen of the vessel will be 

 known by the absence of the small swelling which occurs in 

 subcutaneous injections. If preferred, the vein may be first 

 laid bare by snipping the skin over it. The needle is then 

 introduced. 



5. Inoculation into the Anterior Chamber of the Eye. 

 Local anaesthesia is established by applying a few drops of 



9 



