36 
Williams, on the Martin Microscope. 
tliey liave been readily recognised ; but this would have re- 
quired a knowledge of the instrument which possibly no one 
but Mr. Quekett possessed. This was also the case with some 
of the other instruments^ various pieces of apparatus belong- 
ing to which I had the pleasure of restoring to their original 
position_, and thus of making the lots to which they belonged^ 
complete. 
Before I proceed further,, I must call your attention to the 
triangular box in which the apparatus is contained. This 
forms the original table or stand for the instrument^ and a 
very steady and most convenient one it is ; for as it runs on 
castors, and is in its proper place on the floor, it can be 
brought close up to the observer, and the instrument being- 
inclined to a suitable angle, he is enabled to enjoy the luxury 
of his easy chair and his microscope at the same time, while 
the apparatus, being within easy reach, can be applied with 
great facility. It must also be remarked that from its pe- 
culiar shape, this box occupies the least possible space, and is 
consequently not at all in the way, as it takes up no more 
room than is absolutely necessary for the support of the mi- 
croscope, and as it stands upon three feet it is perfectly steady. 
I shall not take up your time by describing forceps and 
other ordinary apparatus. It may suffice to say they are 
of the usual form, and are applied either by insertion into 
the holes of the stage, or by means of the clip, as I now fix 
the frog-plate, which can be placed in any direction required 
by means of the clip. The objects are contained in six ebony 
slides; three of these afford accommodation for seven objects 
each, and the other three have three oblong apertures in 
each for wings of insects and other large objects. The objects 
are between talc, and are of the most ordinary description, 
one slide being filled with pieces of cloth and other textile 
fabrics, and another with portions of common sea-weeds, 
flustra, and corallines. The wings are those of the libellula, 
and other large insects. 
We have here a piece of apparatus for viewing transparent 
or opaque objects. It consists of a brass, semicircular frame, 
with three apertures. Black and white ivory disks fit into 
two of these apertures, and the third evidently had originally 
a glass in it, and with the glazed cover formed a convenient 
live box. The whole fits into the stage, and can be moved 
on a centre in any direction. 
For the viewing objects in water, this brass frame, with 
seven live boxes of differ ent sizes, has been employed. The 
frame is applied as in the last instance, and the boxes can 
thus be brought in succession under the power with the 
greatest ease. 
