SCIENTIFIC SUMMAEY. 
325 
stay in place. Mr. Slack has, however, expressed his own views in a letter 
to the same Nmnher of the “ M. M. J.” — [This note was crushed out of the 
last Number of P. S. E.] 
Microscopical Papers of the Quarter. — The following papers have appeared 
during the quarter in the “ Monthly Microscopical Journal ” for April, May, 
and June : — 
Some Eemarks on a Minute Plant found in an Incrustation of Carbonate 
of Lime. By K. L. Maddox, M.D., H.F.E.M.S. — Notes on the Micro- 
Spectroscope and Microscope. By E. J. Gayer, Surgeon H.M. Indian 
Army. — On the Structure and Function of the Eods of the Cochlea in 
Man and other Mammals. By Urban Pritchard, M.D., F.E.C.S., 
Demonstrator of Physiology, King’s College, London. — A New Formula 
for a Microscope Object-Glass. By F. H. Wenham. — Professor Smith’s 
Conspectus of the Diatomacese. By F. Kitton, Norwich. — Hair in its 
Microscopical and Medico-Legal Aspects. By Dr. E. Hofmann. — A 
New Callidina : with the Eesult of Experiments on the Desiccation of 
Eotifers. By Henry Davis, F.E.M.S. — On Agchisteus Plumosus. By 
E. Parhtt. — An Apparatus for Obtaining the Balsam ” Angle of any 
Objective. By Robert B. Tolies, U.S. America. — On Bog Mosses. By 
R. Braithwaite, MD., F.L S. — Binoculars for the Highest Powers. 
By F. H. Wenham, Vice-President R.M.S. — Professor Smith’s Con- 
spectus of the Diatomacese. By Professor H. L. Smith. — A New 
Method of Preserving Tumours and certain Urinary Deposits during 
Transportation. By Joseph G. Richardson, M.D., Microscopist to the 
Pennsylvania Hospital. — On an Entozoon with Ova, found encysted in 
the Muscles of a Sheep. By R. L. Maddox, M.D., H.F.R.M.S. — On 
the Development of the Face in the Sturgeon (Accipenser Sturio). By 
W. K. Parker, F.R.S. — On Cutting Sections of Animal Tissues for 
Microscopical Examination. By Joseph Needham, F.R.M.S., &c.. 
Demonstrator of Histology at the London Hospital Medical College. — 
Remarks on the Aperture of Object-Glasses. By Assistant-Surgeon 
J. J. Woodward, IJ.S. Army. With a Note by F. H. Wenham, 
V.P.R.M.S. — Remarks on Mr. Henry Davis’ Paper On the Desiccation 
of Rotifers.” By C. T. Hudson, LL.D. 
A Neiu Microscopic Object Glass. — A paper of Mr. Wenhams, V.P.R.M.S., 
on this subject, has appeared in the ‘^Monthly Microscopical Journal” for 
April. It is of considerable interest and of some length, but the author says that 
it is of necessity incomplete, for want of definite information concerning 
the optical properties of various kinds of glass. Data obtained from working 
them into small lenses furnish only a rough approximation to the mean dis- 
persive power of the combined flint and crown having the best apparent 
■effect. Of the intermediate rays, little can be known beyond the mere 
appearance of more or less of a secondary spectrum. Nothing of importance 
has been published since Fraiinhofer’s Table, containing the refractive in- 
dices for each of the seven primary colour-lines of the spectrum for ten 
kinds of glass : great advance has been effected since that date in the manu- 
facture of optical glass, a most complete collection of which of every variety 
has been made by the Rosses up to the present date. Selected specimens 
from this will be worked into prisms, and the relative spectra mapped out 
