THE MICROSCOPE. 



89 



tained. On the other hand, the glass stage is as frequently in 

 the way, and on the whole the student can very well dispense 

 with it, as its disadvantages will nearly or quite counterbalance 

 its convenience. No rubber should be employed around the 

 stage nor in fact anywhere around the microscope. 2 The 



1 Nos. TO to 18 are immersion. 



2 Besides its electrical qualities which render it a nuisance, rubber is readily 

 affected by turpentine and benzole which are so necessary in microscopic work. 



