of Photography to the Microscope. 187 
in the compound body, as recommended by Shadbolt, if the 
eye-piece is not employed. Precautions must of course ke 
that light does not enter at unguarded points. At F is a rod 
connected with a flap of blackened sheet brass in the interior of 
the box, with which the exposure of the sensitive plate is very 
conveniently effected. It is obvious that while the operator is 
manipulating the mirror, or using the stage movements, on ac- 
count of the length of the apparatus it is impossible for him to 
Concentrating the light of a small camphene lamp on the object 
with lenses. | 
lth two le Vhenam in repeating this experiment met 
with no success. I concentrated the light of t 0 
“burning fluid” lamp with a bulls-eye-condenser on the object, 
Minutes. With samples prepared by myself tolerably intense 
hegatives were Sbininad in four minutes. With the ¢ inch ob- 
own work direct sunlight is always employed. aie 
display of microscopic objects, 
be 
if the 
oy 
f 
