igS CLINICAL BACTERIOLOGY AND HiEMATOLOGY 



Tuberculosis, except tuberculous meningitis (15,000 to 25,000), 

 and occasionally in tuberculous pleurisy (10,000 to 20,000). 



Typhoid fever. 



Malta fever. 



Measles. 



Malaria. 



Mumps. 



Varicella. 



Pernicious ancemia. 



Chlorosis. 



Primary syphilis. 



Influenza. 



In any of these there will be leucocytosis if an inflammatory 

 complication is present. Thus, in typhoid fever with perforation 

 or pneumonia the count is raised. 



Very severe sepsis. 



V. A Lowered Count, or Leucopenia (under 5,000).— This 

 is not met with very frequently, and all the cases are included 

 under IV. The chief are typhoid fever, pernicious ancemia, chlorosis, 

 influenza, malaria, and uncomplicated tuberculosis. It is also found in 

 starvation and malnutrition. 



THE INVESTIGATION OF THE MORPHOLOGY OF 

 THE LEUCOCYTES AND RED CORPUSCLES 



To study the morphology of the leucocytes and red corpuscles 

 it is necessary to prepare thin and even films of the blood, and to 

 submit them to appropriate methods of staining. 



Method of Preparing Films — I. With Cover- glasses. 



This is the best method for ordinary purposes, and, if the in- 

 structions are carried out exactly, is a very easy one. 



Requisites.- — i. Perfectly clean cover-glasses. They should be 

 cleaned by one of the methods described on p. 31, and kept in 

 spirit. Immediately before they are required for use they must 

 be removed with a clean pair of forceps and dried with an old 

 and soft handkerchief. They may then be passed rapidly through 

 the flame, and allowed to cool. 



I prefer No. 2 cover-glasses for this examination, as much 

 better films are made on them than on thin ones, which are 



