332 
TOPULAR SCIENCE REVIEW. 
MICROSCOPY. 
Contents of the Microscopical Journal. — During the past three months the 
contents of this journal, besides several letters, and the reports on the pro- 
gress of microscopical science, have been as follows : — “ On the Structure of 
the Podura Scale, and certain other Test-objects, and of their Representation 
by Photomicrography.” By Lieut.^Col. Dr. J. J. Woodward, U.S. Army. — 
“ Microscopical Examination of Water for Domestic Use.” By James Bell, 
F.C.S. — “ On the Winter Habits of the Rotatoria.” By Charles Cubitt, 
C.E., F.R.M.S. — “ The Magnifying Power of the Microscope.” By Count 
Castracane. — “A Few Experiments bearing on Spontaneous Generation.” 
By Metcalfe Johnson, M.R.C.S.E., Lancaster. — “On the Mode of Working- 
out the Morphology of the Skull.” By W. Kitchen Parker, F.R.S., Presi- 
dent R.M.S. — “Linear Projection considered in its Application to the 
Delineation of Objects under Microscopic Observation.” By Charles Cubitt, 
C.E., F.R.M.S. — “ Optical Appearances of Cut Lines in Glass.” By Henry 
J. Slack, F.G.S., Secretary R.M.S. — “Object-glasses and their Definition.” 
By F. H. Wenham, Vice-President R.M.S. — “Transmutation of Form in 
certain Protozoa.” By Metcalfe Johnson, M.R.C.S.E., Lancaster. — “ Micro- 
scopical Examination of Two Minerals.” By Prof. A. M. Edwards. — “Ad- 
ditional Observations concerning the Podura Scale.” By Dr. J. J. Wood- 
ward, U.S. Army. — “ Remarks on the General and Particular Construction 
of the Scales of some of the Lepidoptera, as bearing on the Structure of the 
‘Test Scale’ of Lepidocyrtus curvicollis.” By R. L. Maddox, M.D. — “On 
the so-called Suckers of Dytiscus and the Pulvilli of Insects.” By B. T. 
Lowne, M.R.C.S. 
Photomicrographs for the Stereoscope. — In the “Microscopical Journal” 
for May there is an abstract of Dr. R. H. Ward’s interesting researches on 
this point. Dr. Ward informs us, that in order to photograph, without 
delay, any field of view which a working microscopist deems worthy of 
preservation, he should have a camera mounted on a plank which is blocked 
at one end for the feet of the stand used as a “ working instrument.” 
Then, whenever desired, the eye-piece is removed, the instrument levelled 
into a horizontal position and placed accurately on the plank, and the mag- 
nified image instantly thrown upon the focussing plate of the camera. 
Finding the usual band, passing around pulleys and over the fine-adjust- 
ment wheel, to be a slight annoyance in carrying out this plan with the 
stand he ordinarily uses (a large stand of the “ Jackson” model), he makes 
the fine-adjustment by a somewhat soft cylinder of india-rubber lying 
upon the wheel. This cylinder is rather more than three inches long, is 
an inch and a half in diameter, and weighs about four ounces. It is open 
through its centre, like a tube with thick walls and small bore, and is 
mounted upon one end of a straight, light, w r ooden rod, the other end of 
which is supported on or near the top of the camera. It is prevented 
from rolling off from the fine-adjustment wdieel by a horizontal wire, trans- 
verse to the axis of the apparatus, attached by a hinge-joint to a post at 
the side of the wheel, loss of motion is simply impossible, and an extremely 
fine and manageable motion is secured. The unequalled facility and cer- 
