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POPULAR SCIENCE REVIEW. 
This massive kind is externally altered. Vom Rath also states that the 
locality of serpentine-pseudomorphs affords others of monticellitc altered to 
fassaite. The crystals are an inch and less in size. They have sometimes a 
nucleus of serpentine or calcite. The fassaite pseudomorphism in all cases 
preceded the serpentine. 
MICROSCOPY. 
Tapers of the past Quarter, — The following papers have been published in 
the “ Monthly Microscopical Journal” for the months of July, August, and 
September : — 
Notes on Bucephalus Polymorphus. By Charles Stewart, F.L.S., Hon. 
Sec. R.M.S., &c. — Measurement of Angular Aperture. By J. W. 
Stephenson, F.R.A.S., Treasurer R.M.S. — Notes on the Use of Mr. 
Wenham’s Reflex Illuminator. By Henry J. Slack, F.G.S., Sec. 
R.M.S. — On Dr. Schumann’s Formulae for Diatom-lines. By W. J. 
Hickie, M.A., St. John’s College, Cambridge. — Number of Striae on 
the Diatoms on Moller’s Probe-Platte. By F. Kitton, Norwich. — On 
Bog Mosses. By R. Braithwaite, M.D., F.L.S. — On the Unit of Linear 
Measurement. By Rev. D. Edwardes, M.A., St. Chad’s College, 
Denstone. — The Microscope and its Misinterpretations. By John 
Michels. — Double Staining of Wood and other Vegetable Sections. 
By George D. Beatty, M.D., of Baltimore. — On Conjoined Epithelium. 
By S. Martvn, M.D., F.R.C.P., Lecturer on Medicine and Pathological 
Anatomy, Bristol Medical School. — The Microscopic Germ Theory of 
Disease ; being a Discussion of the Relation of Bacteria and Allied 
Organisms to Virulent Inflammations and Specific Contagious Fevers. 
By H. Charlton Bastian, M.D., F.R.S., Professor of Pathological 
Anatomy in University College. — A Modification of Dr. Rutherford’s 
Freezing Microtome. By William James Fleming, M.B., Assistant to 
the Professor of Physiology, Glasgow University. — On the Origin of 
Life. By Lionel S. Beale, M.B., F.R.S. — On the Existence of Flagella 
in Bacterium Termo. By W. H. Dallinger, F.R.M.S., and J. J. Drys- 
dale, M.D., F.R.M.S. — A New Mode of Illuminating for High Powers. 
By Dr. AVhittell. — The Resting Spores of the Potato Fungus. By 
Worthington G. Smith, F.L.S. 
PHYSICS. 
Action of Magnets in Geissler Tubes. — This has been recently investigated 
by M. J. Chautard, who has studied somewhat at length the effect of a 
magnet on rarified gases enclosed in capillary tubes, illuminated by an in- 
duced current. The gases or vapours employed were II, N, 0, C0 2 , CO, 
C 2 H 4 , S, Se, I, Br, Cl, S0 2 , SiF 4 , SnCl 4 . Bodies of the chlorine family are 
those which gave the most concordant and brilliant effects. An increase of 
temperature diminishes the action of the magnet. This is shown by allow- 
ing the current to pass, for some time, when the magnetic influence is en- 
