224 THE Microscopes. 
ZENTMAYER’S NOSE-PIECE. 
pee new detaching nose-piece consists simply of an adapter 
with the Society screw to be attached to the microscope, 
The screw is provided with a jam nut, to enable one to bring 
the index of the adapter in front of any microscope. One 
screw of the adapter has the opposite quarters of its screw 
threads removed. 
Collars are furnished to attach to the 
objectives, having the same screw of which 
the corresponding opposite quarters are re- 
moved. When the indices of the collar 
and adapter correspond, the collar will enter 
and it requires only one-quarter turn to 
screw it home, one hand only being used. 
It is as rigid asan ordinary adapter with 
full screw; it is light, short and durable, 
and most of the objectives with the collar 
on, will fit their boxes. 
EASY METHOD OF OBTAINING BACTERIA. 
BY J. M. ADAMS. 
(Seetie analine violet, blue, or brown in glycerine, with 
or without alcohol or carbolic acid. Prepare thin covers 
by dropping with pipette a drop of thin bacterial fluid on each, 
and allowing it to dry thoroughly. Cover the dried bacterial 
film with a drop of the staining and let it remain an hour, or 
long enough to stain deeply. Puta drop of water on center of 
slide and invert the cover-on it ready for mounting, letting it 
sway slightly to and fro to wash away a part of the surplus 
staining and glycerine, but not to remove the film. Press down 
the cover with a blotter, which will absorb the surplus, and 
ring quickly. The glycerine being washed away in part does 
not materially dim the bacteria or affect the analine, and it is 
surprising how distinctly visible all kinds of bacilli spiralle, and 
some of the bacteria and micrococci appear by this process. 
One pleasant advantage is the freedom from sediment, as is 
