76 



BACTEKIliLOGY. 



for general u-e, ir i,^ the best form of arridoial illumiuatiou for the 

 mieroM-'ope. 



An ordinary [>arafliu Limp of the cheapest form may be ii>eil. 

 but there are many objection^ to it. such as the shape of the 

 clhmnev. auJ the >tri;i? and defects in tlie ghis^. The best form of 

 paraffin lamp i-> constructed by Baker and bv Swift from sug- 



FiG. 21. — MicKOscOFE Lamp. 



gestions by Xelson and Dalhnger (Fig. 21) ; there is also a similar 

 but much larger pattern -n-hich is made by S-svift (Fig, 22). This 

 form of lamp has a large flat bowl for the oil. It is attached To 

 a standard, and can be raised or lowered to the desired position. 

 The chimney is of metal and blackened, so that there is no reflected 

 light, and it may also with advantage be piro\-ided with a shade, 

 so that no light reaches the eye except through the microscope. 



The burner may be made to revolve, so that either the edge or 



