NOTES AND QUERIES. 21 
SwINcGING SupsTAGEs.—At a recent meeting of the Royal 
Microscopical Society Dr. Carpenter gave a description of a 
microscopic stand made by Mr. Wales, of New York, in which the 
inclination of the body did not diminish its stability. Dr. Car- 
penter also stated that he had worked with the Ross-Zentmayer 
swinging substage and had found it very serviceable. He would 
hail with satisfaction its application, or an equivalent, to all student’s 
microscopes. 
THE RepropucTION oF Microscopic Drawincs.—Drawings 
made upon paper with the aniline (graph) ink manufactured by 
Messrs. Judson and Sons, 77, Southwark Street, London, S.E., 
may be extensively reproduced by placing in contact with a layer 
of glycerine jelly, which produces a negative from which at least 
50 copies may be easily obtained. By laying a sheet of writing 
paper upon the negative a slight pressure or smoothing action of 
the finger will give a very clear impression. The jelly may be 
made by soaking two ounces of the best glue in four ounces of 
water for two days, melting by means of heat, and when fluid 
stirring in 6 ounces of commercial, but strong glycerine. 
How To opsERVE MELICERTA RincENs.—For examination of 
Melicerta under the 3, 4-1oth, and } inch powers, it may be 
advantageously placed in a slide trough or tube cell of about 1-6th 
of an inch or less, covered with thin glass. To do this an indi- 
vidual should be noted on the weed, conveniently placed on a 
leaf, or, still better, on the stem. With a small pair of nail scissors, 
the leaf on which the individual is placed should be cut off the 
weed, leaving a small piece of the stem attached, and so transferred 
to the trough or cell. It may sometimes be necessary, with the 
scissors, to pare down or split the leaf carefully without injuring 
the specimens, so as to reduce the leaf to a less width than the 
depth of the trough or cell. This being done, the leaf can be 
placed in the trougli or cell sideways, and the piece of stem attached 
to it retains it in that position, otherwise the Melicerta tube, which is 
generally built in a position standing up from the surface of the leaf, 
would not be conveniently placed for examination. Zhos. Bolton. 
A CAMERA LucIDA FoR EIGHTPENCE.—Mr. H. E. Forrest, 
F.R.M.S., has devised a small instrument simulating Dr. Beale’s 
neutral tint reflector, for the purpose of sketching microscopic 
objects. Its price is sixpence, or post-free eightpence, and can be 
obtained from Mr. Thos. Bolton, 57, Newhall Street, Birmingham. 
During a recent visit to Birmingham, we gave this instrument a trial, 
and can confidently recommend it to our readers. 
Gass CrysTALs.—It may be unknown to many microscopists 
that glass such as we see every day, can be made to crystallize. 
Fig. 1 shows a crystal, which appears to be the nucleus of a 
