: Ree ee aa 
i “: te he . 5 3 ye 
en te er Se eS ; oy 
: bees _ REPORTS FROM THE SECTIONS. 
_ ‘The Gne exkibited is about equal to a single lens of j-inch 
and is not very inferior to an achromatic objective, over 
which it possesses very decided advantages for our present purpose 
14 { 
as diatoms as one = Lhomboides may be — recognized, its use 
mounting is 
I find ee a Seca of the rays are shut out oe a suit- 
_ able diaphragm the definition is ae but as this limits the 
field T have preferred in —— 
