BACTERIOLOGICAL MICROSCOPE. 3 
it is useless to do so unless the stand is sufficiently 
steady to carry an oil immersion lens: and it is. useless 
to think of having an inefficient fine adjustment altered . 
for bacteriological use. ; 
There are now many microscopes which are sold at a 
Fic. 2.—Bacteriological Microscope. 
comparatively small price and which will answer every 
purpose. Of these Leitz’s IIb stand, with the lenses 
above mentioned, a triple nose-piece (which is so great 
an advantage that it might almost be called an essen- 
tial) and two eye-pieces costs about £13 and may be 
B2 
