118 BACTERIOLOGICAL DIAGNOSIS. 
PART III. 
COLLECTION AND EXAMINATION OF 
CERTAIN MORBID MATERIALS. 
Methods of collection and examination of :— 
Fluids from the pleural cavities. 
Fluids from the synovial cavities. 
Fluids from the meninges (lumbar puncture). 
Pus. 
Materials obtained at post-mortem examinations. 
The blood, including :— 
1. Enumeration of red corpuscles. 
2. Enumeration of leucocytes. 
3. Preparation of blood films. 
4. Examination for the parasite of malaria. 
5. Bacteriological examination. 
Solid materials by sections. 
THE COLLECTION OF PATHOLOGICAL 
EXUDATES. 
A bacteriological examination of the inflammatory 
exudates which collect in the various cavities of the 
body often yields important information as to the 
nature of the morbid process, suggests treatment, and 
influences our views as to the prognosis of the con- 
dition. This is especially the case with the fluids 
which collect in the pleura, the membranes of the brain 
