406 MANIPULATION AND PRESERVATION OF THE MICROSCOPE 



rod, ]>. is screwed. The square rod carries a socket, 0, with an arm, 

 D, to which the lamp is attached. 



On each side of the burner, and attached to the arm, I), is an 

 upright rod, G, to one of which the chimney is fixed, independent of 



reservoir of the lamp, thus enabling the observer to revolve the 

 ni-r and reservoir, and ol.iaiii cither the edge or the flat side of 

 the Maine without altering the posilion of the chimney. The 

 chimney, I 1 ', is made of thin lra. witli t \\< > openings opposite to 

 other, into \\hich slide 3x1 glass slips of either white, blue, or 



