218 
POPULAR SCIENCE REVIEW. 
out the front glass, and remove the hour and minute hands. Paste over the 
face of the watch a piece of dead-black paper with a round window cut in 
it, so as to leave nothing exposed but the small circle in which the seconds 
hand rotates. Place the watch on the front of the mirror of the microscope, 
and condense the light of a strong flame on the small white circle that has 
been left exposed. Reflect this light through the beetle’s eye, previously 
placed on the stage, just in the same manner as if the ordinary mirror were 
being employed. Bring the eye into focus, and then gradually draw back 
the objective by means of the fine adjustment until the images of the watch 
hand appear. At first these will probably be dim, but by varying the 
inclination of the watch and careful adjustment of the light the observer 
will at length obtain a bright and distinct image through each lens of the 
eye. The nearer the watch can be brought to the stage without cutting off 
light from the condenser, the larger will be the image. Any power may be 
used from § to § inch, but I prefer a j~th, with a No. 2 eye-piece. Under 
this power the images are sufficiently enlarged, and a good number of them 
are included in the field. The eye may be mounted in balsam, but I think 
I have obtained better results from one specially prepared and mounted in 
glycerine. 
Microscopical Papers of the Quarter . — The following is a list of the con- 
tents of the “ Monthly Microscopical Journal ” for Jan., Feb., and March 
1876 : — 
The Absorptive Glands of Carnivorous Plants. By Alfred W. Bennett, 
M.A., B.Sc., F.L.S., Lecturer on Botany at St. Thomas’s Hospital. — 
Reproduction in the Mushroom Tribe. By Worthington G. Smith, 
F.L.S. — Avoiding the Use of the Heliostat in Micro-photography. 
By G. M. Giles, M.M.M.S. — Improved Method of Applying the 
Micro-spectroscopic Test for Blood-stains. By Jos. G. Richardson, 
M.D., Attending Physician to the Presbyterian Hospital ; Microscropist 
to the Pennsylvania Hospital. — Remarks on the Foraminifera., with 
especial reference to their Variability of Form, illustrated by the 
Cristellarians. By Professor T. Rupert Jones, F.R.S., F.G.S. — The 
President’s Address. By H. C. Sorby, F.R.S., F.L.S., F.G.S., F.Z.S., 
&c. — Further Notes on Frustulia Saxonica. By W. J. Hickie, M.A., 
St. John's College, Cambridge. — On the Characters of Spherical and 
Chromatic Aberration arising from Excentrical Refraction, and their 
relations to Chromatic Dispersion. By Dr. Royston-Pigott, M.A., 
F.R.S., F.C.P.S.— On Staining and Mounting Wood Sections. By 
M. H. Stiles. — On a Mode of Viewing the Seconds Hand of a Watch 
through a Beetle’s Eye. By Dr. Whittell. 
PHYSICS. 
Utilising the Solar Pays . — A method for this purpose has been described 
before the French Academy by M. A. Mouchot. The author’s apparatus is 
composed of three distinct pieces — a metallic mirror with a linear focus ; 
a blackened boiler, the axis of which coincides with this focus ; a glass en- 
closure, which allows the solar rays to reach the boiler, but opposes their 
