190 



THE MICROSCOPE. 



or side-reflector, the plane side must be turned towards 

 the lamp. 



FIG. 124. -Bull's-eye Condensing Lens. 



The Microscope Lamp. The 

 introduction of paraffin into 

 household use has somewhat 

 modified our views with regard 

 to the most suitable artificial 

 source of illumination. Paraffin 

 burns with a whiter and purer 

 flame than either oil or gas, and 

 consequently is less liable to pro- 

 duce fatigue or injury to the 

 eyes. The first cost of the lamp 

 is trifling ; for a moderate sum a 

 handy form of lamp can be pro- 

 cured, mounted on an adjustable 

 sliding-ring stand, and with a 

 porcelain, metal, or paper shade, 

 to protect the eyes from scat- 

 tered rays of light (fig. 125). 



To give the increased effect of 

 whiteness to the light ("white FIG. 125. Beck's Microscope 



cloud illumination" as it is 



Lamp. 



termed), take a piece of tissue paper, dip it into a hot 



