59 CAEE OF THE EYES. 



It is the common experience with microscopists that the eyes 

 improve with use and are permanently benefited, the same as by 

 judicious exercise of other portions of the body. 



The light suitable for microscopical work should be strong 

 enough to enable the object to be clearly seen, yet not so bright as 

 to dazzle the eyes. Always avoid direct sunlight. The light from 

 a north window is to be preferred, especially if the sky is clear 

 or covered only with white clouds. Microscopic work can be carried 

 on in the evening by lamp, gas, or electric light. Lamp and gas 

 light are not very desirable and usually give unsatisfactory results. 



The use of electric light is very highly recommended, provided 

 a ground glass shade be fitted to the incandescent lamp. This gives 

 a uniform, modified light and proves to be very satisfactory. 



