Answers to Queries. 137 
372.—Microscope.—By all means get a good stand with 
Society’s Standard screw to start with ; this with one eye piece and 
x” and 4” objectives can be had for £4 or £5 from the best 
makers. Then, when experience is gained, more expensive and 
higher powers can be added. If R. C. will write to me, through 
Our worthy editor, I can give him the full results of my 
experience in buying a microscope. I bought mine at £20, to 
start with, from a well known maker, who supplied it with a 2” 
objective that was quite useless, and which he promised to change, 
and did so after four years had passed. ad I now to go over the 
same ground, I would buy one of the new-pattern foreign instru- 
ments, with a much shorter tube than the ordinary English make. 
Having recently had the pleasure of working with one of these, I 
can testify to its extreme convenience and suitability to every 
purpose required by those whose studies necessitate the use of no 
higher power than 1%”. HooWe. Ler. Nie A. 
373.—Noctiluca Miliaris.—I cannot recall to mind any article 
which gives a notice of the anal orifice specially. The chief 
writer, I believe on this monad is Cienkowski, and of those found on 
the U.S. coast, Mr. E. Bicknell. I believe the only outlet from the 
esophagus, which passes into the digestive cavity, is an oval nucleus 
which lies in front, and represents the anal orifice. A network of 
granular fibres arises from the granular layer ; these fibres pass into 
the middle of the body tothe nucleus and digestive cavity. I would 
refer B. O. RB. to F. Ritter v. Stein, in Part III. of his ‘‘ Organisms 
der Infusions,” abth. III., Halfte II., in which he discusses the 
Noctilucidze, Ptychodiscus, etc., and mentions that in addition to 
a mouth-opening there is another opening which is analogous to an 
anus. See also Clans and Sedgewick ; Huxley, “Invertebra;” and 
Rolleston, Quarterly Journal Microscopical Sctence. VAS Tes 
374.—Eye of Cat.—The muscles of iris are zzvoluntary, 
sphincter and dilators ; and the ciliary muscle consists of unstriped 
muscle. V.A.L: 
375.—Amputation of the Leg.—The mind refers the origin of 
every sensation that reaches it through a sensory fibre, to the end 
organ of that fibre, even though stimulation has been applied to 
the trunk of the nerve. Thus, persons whose arms or legs have 
been amputated often feel sensations, which they refer to their 
fingers or toes. Any stimulation of the optic nerve, mechanical 
or electrical, the mind refers to the action of light upon the 
retina. See Wein Mitchell on Nerve Phantoms, Lipincott’s 
Magazine, and Injuries and Diseases of Nerves, for a better and 
more complete explanation. V. A. LaTHaM. 
377.—Plant Crystals.—Notwithstanding the researches of 
numbers of botanists, the use of plant crystals, whether raphides, 
