VACCINE-THERAPY 33 



Blood Stains. 



The two in most common use are Jenner's and Irish- 

 man's, and are best bought already prepared. 



Jenner's Stain. — A film is allowed to air dry and then 

 flooded with the stain. This stain fixes as well as stains 

 the specimen, taking three minutes to act. It is then poured 

 off, washed in water, dried, and mounted. 



Leishman's Stain. — A film is prepared and air dried. 

 The specimen is flooded with the stain and allowed to act 

 for thirty seconds, after which a double volume of distilled 

 water to stain is added on to the film and mixed with a 

 platinum loop. This diluted stain is now allowed to act 

 for five minutes. Wash in water, leaving some water on 

 the film for half a minute to bring out the colour. Dry 

 and mount. 



