ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
547 
the side of the case. A screw stop is inserted in the front of the case 
above each slot. 
The case is fitted for 3 in. by 1 in. glass slips of any thickness, and 
has a capacity of six to twelve dozen. It has four compartments for the 
cover-glasses of the sizes 1/2 in., 3/4 in., 7/8 in, or 12-24 mm., either 
circles or squares or oblongs of the above widths, and any lengths up 
to 2J in. The screw stops regulate the depth of the slots for either 
No. 1, 2, or 3 thickness of cover-glasses. 
Fig. 82 is a vertical section from front to back showing the plan of 
the case. The section of the lower half is made in the median plane, 
Fig. 82. 
that of the upper half in the plane of the screw stop. Through the 
base b projects the stop s into a narrow groove in the mounting-table nit , 
which slides in and out between the base and the floor / of the stock 
compartments sc’. The service compartment sc is deepened by a shallow 
cavity cut into the upper surface of the mounting-table, and in the bottom 
of this cavity is fitted a sheet of celluloid bearing a series of concentric 
lines. The slips ss are stacked in the service compartment, the lowest 
slip fitting the shallow cavity in the mounting-table, as shown at ss'. A 
