34 BACTERIOLOGICAL DIAGNOSIS. 
The bacillus of tetanus. 
<5 5 tuberculosis. 
9 9 leprosy. 
The actinomycosis fungus. 
The following important pathogenic bacteria do not 
stain by Gram’s method :— 
' ‘The gonococcus. 
Diplococcus intracellularis meningitidis (Weich- 
selbaum). , < 
Still’s diplococcus oe posterior meningitis. 
The pneumo-bacillus. & 
The bacilli coli communis, 
The bacillus of glanders. 
” 3 typhoid fever. 
Fr ey influenza. 
” ” plague. 
”. ” soft sore. 
-The-vibrio of Asiatic cholera. 
EXAMINATION OF FILMS. USE OF MICRO- 
SCOPE. 
Daylight is the best illuminant for ‘microscopic work, 
and the light reflected from a white cloud opposite the 
sun is best of all. Direct sunlight is, useless, but the 
light obtained from a ground glass window on which 
the sun is shining is very good. 
For work at night the light from an incandescent gas- 
burner at a distance of two or three feet is excellent, 
but an ordinary paraffin lamp will answer quite well. 
Having arranged for a suitable source of light turn 
the flat mirror uppermost and move it about until 
