Piper, on a Portable Slide Cabinet . 17 
compartments, each holding a single slide in a horizontal 
position. 
The trays are enclosed in a strong millboard box, the front 
of which is made to fall down, so as to permit the trays to be 
readily withdrawn. When closed, an elastic band renders 
the whole firm and secure. 
It may be made of any desired capacity. Specimens are 
placed on the table capable of receiving from six to two 
hundred and fifty slides. The smallest is well adapted to 
contain a “ half-dozen series” of anatomical or other subjects; 
and its great strength, combined with lightness, makes it 
peculiarly available for transmission through the post. 
The one figured above is, however, that to which I would 
more particularly call your attention, being of a convenient 
size, and suitable for carrying in the pocket. It contains six 
trays, and will therefore hold three dozen slides. 
Amongst the advantages which may be derived from the 
use of these cabinets I will mention the convenience of dis- 
playing at one view the entire collection of slides, and the 
facility thus afforded for the selection of any required speci- 
men without the troublesome search and difiiculty of 
removal frequently experienced with the old form of box, in 
which the slides are dropped (out of sight) into perpen- 
dicular grooves. It also prevents the possibility of the covers 
becoming detached by shaking about in transit, which is im- 
portant when it is required to convey a rare or valuable 
collection. 
The trays, being all of uniform size, may be transferred 
from one cabinet to another of larger or smaller dimensions 
