528 THE NEW IMMERSION ILLUMINATION. 
due, in no small degree, to the recurrent ice action of the northern 
hemisphere, so close is the connection between this most destruc- 
tive agent and the highest life. E 
EE E 
THE NEW IMMERSION ILLUMINATION. 
BY R. H. WARD, M.D. 
Tue new illuminating lens, introduced by Mr. Wenham recently, . 
has proved to be a sufficiently important accessory to the micro : 
scope to command more attention than it has yet received in this 
Fig. 123. 
SSCA Se 
the central part of its curvature stopped off with 
and for convenience the part intended to be th 
‘may be ground away as shown in Figs. 123 and p l 
surface being subsequently painted black. The lens j et 
is temporarily attached by some highly refracting medium: 
Gn o l 
