548 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
warning slip of paper tvs is folded around the front edge of the top slip. 
The loose partitions p running in the grooves in the sides of the case 
can be removed after sliding back the cover c. In the base/' of the cover- 
glass case is the groove r' for the roller r, which is made of brass and 
covered with chamois. To the front of the base is hinged the brass dust- 
excluder de, whose lining of silk plush protects the grooved table t and 
the slot si from dust. The dust-excluder also prevents the delivery of a 
cover-glass by the roller, except when the slot is opened. Into the slot 
projects the point of the screw-stop st, which is so adjusted as to permit 
the passage into the slot and out upon the grooved table of only one 
cover-glass at a time. Above the roller are stacked the cover-glasses eg. 
Near the top of the stack is placed a warning disc w, and upon the top 
cover-glass rests the loosely fitting follower c /, which prevents dis- 
placement and breaking of the covers if the case is accidentally over- 
turned. The adjustable partition ap may be moved backward or forward 
to fit any length of cover-glass from 1/2 in. to 2£ in. The cover c' is 
so constructed as to exclude dust. 
Method of operation : — Thoroughly dust the inside of the case, and 
partly, or completely, fill the compartments with clean slips and cover- 
glasses of the proper sizes, and place the warnings in position. The 
apparatus is then ready for immediate use, or at any time during suc- 
cessive weeks or months until the stock of slips and covers is exhausted. 
The slips are withdrawn from the case singly by pulling forward 
the mounting-table, and from this they are removed, either before or 
after an object is mounted, by inserting a finger into the notches cut into 
the sides of the table. The warning slip having been withdrawn, the 
service compartment is again filled by removing the sliding cover which 
carries with it the cover-glass case, withdrawing a loose partition and 
sliding the cleaned slips from a stock compartment into a service com- 
partment. 
Whenever a cover-glass is needed, the dust-excluder in front of the 
proper slot is opened by a touch of the finger, the milled wheel is rotated 
and the chamois- covered roller pushes the bottom cover-glass through 
the slot and out upon the grooved table, where it is readily grasped by 
the forceps. This action is positive, because the friction between chamois 
and glass is greater than between two clean glass surfaces. The table 
being grooved, only the extreme margins of the cover-glass touch it. A 
touch of the finger closes the dust-excluder. 
It will be noted ( a ) that the slips and covers are doubly protected 
from atmospheric impurities by the dust-proof case and the constant 
contact of clean glass surfaces with each other; and ( b ) that in the 
process of removal for use they do not come in contact with any surface 
from which they receive dust. They come out as clean as when, weeks 
or months before, they were put into the case. Thus the dust problem 
is solved.” 
Visit to Messrs. Bausch and Lomb’s Factory.* — The following is 
ithe description of a visit of the members of the American Microscopical 
Society to the works of the Bausch and Lomb Optical Company. These 
works “ are situated on North St. Paul Street, No. 515, near the Genessee 
* Proc. Amer. Micr. Soc., xiv. (1892) pp. 27-9. 
