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Mr. F. Fitch:

Balanus balanoides.

Chyle, stomach, and appendages of drone-fly.

Teeth of blow-fly shown in relief.

Mr. C. J. Fox:

Polariscope for convergent light, with mica and selenite combinations.

Rev. T. W. Freckelton:

Macrospores and microspores from coal, compared with spores of Selaginella selaginoides.

Mr. H. E. Freeman:

Eggs of Gasterophilus equi from body of female, showing provision for attachment to hairs of the horse.

Dr. W. J. Gray:

Rutilaria epsilon and other rare diatoms.

Messrs. J. How and Company:

Fossil wood with insect borings and excreta, &c.

A new microscope lamp.

Mr. J. Mayall, jun. :

Some special slides of Amphipleura pellucida.

Dr. Millar:

A new camera lucida, designed by Dr. Russell, of Lancaster.
Dr. Matthews:

Triceratium favus, arranged to show images of a black cross.
Stylaster sanguineus.

Mr. A. D. Michael:

The newly discovered male of Cheyletus venustissimus (see p. 313). Professor Owen, C.B. :

Sections of "Granicones," described at p. 233.

Mr. F. Oxley:

The so-called "Pygidia" of grasshoppers, crickets, &c.

Mr. Thos. Palmer:

Sections of butcher's broom, common cane, &c.

Mr. B. A. Priest:

Portion of the bag of a starfish from China.

Mr. W. W. Reeves:

Section through the cone (Lepidostrobus) of Lepidodendron, with spores in situ, from Lancashire coal-measures.

Mr. C. Stewart :

Section through the growing point of Anacharis alsinastrum.

Mr. A. Topping:

Various sections from the tail of a whale (stained).

Mr. F. H. Ward:

Sections (24) of various plants double stained by himself.

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Anaerobiosis of Micro-Organisms, 259.
Angle of Aperture of Objectives, on
the Measurement of the, 321.
Angles, Dihedral, of Microscopic Crys-
tals, on the Measurement of the, 217,
274.

Angular Aperture defined, 360.
Annelida and Crustacea, the Optic
Rod in the, 283.

a new genus of, Wartelia, 355.
Annual Report of the Society, 39.
Antherozoids. Zoospores, &c., Libera-
tion of the, in the Lower Plants, 342.
Anthrax, Theory of the Action of Bac-
teria in, 370.

Apertometer, Professor Abbe's, Descrip-
tion of, with Instructions for its use, 19.
Aperture, Angle of, of Objectives, on
the Measurement of the, 321.
Angular, defined, 360.

Aperture, Numerical, some Observa
tions on, 51.

Apertures of Microscopic Objectives,
on a Theoretical Limit to the, 139.
Apparatus for Resolving Test Objects,

201.

Apple-tree, Rhizopods in an, 80.
Aquaria, Escape of small Animals
from, 280.

Aquatic Animals, Live, Observation of,

353.

Arctic Expedition, The Diatomacea of
the, 375.

Ashes of Leaves, Microscopical Study
of the, 346.

Atlas der Diatomaceen - Kunde,
Schmidt's, 357.

Atmosphere, Organisms suspended in
the, 192.

B.

Bacteria, Action of very low Tempe-
rature on, 25.

in Anthrax, Theory of the Action
of, 370.

87.

as Parasites in Splenic Disease,

Nutriment of, 86.

on Examining, Preserving, and
Photographing, 195.

the Staining and Preparation of,

268.
Bacterium termo, on the Measurement
of the Diameter of the Flagella of,
169.

and Micrococcus, Life-His-
tory of, 350.
Balsam mounted Objects, on a
"Simple Device" for Illumination
of the, 246.

Balsamed Diatomaceous Tests, the
Finest-lined, Method of Resolving,

45.

Bed-bug and its Allies. on the, 27.
Bedwell, F. A., the Mastax-Frame-
work in Melicerta ringens and Cono-
chilus, described by, with further
Notes on these Rotifers, 176.
Bee, Honey, the Sting of the, 367.
Bibliography, 88, 155, 228, 301, 380.
Binocular Microscope, a French view
of the, 149.

with High Powers, 221.

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Cap, Protecting, for Focussing under
Water, 283.

Capnodium Footii, 161.

Castracane, Count, on Diatoms, 152.
Cell-walls, Vegetable, Importance of the,
in the Phenomena of Nutrition, 362.
Cephalosiphon, 30.

Cestoid Host, a new, 254.
Chamber, a moist, 197.

Chemical Society, Soirée of the, 149.

Cheyletus, the Genus, on a Species of
Acarus of, 133.

venustissimus, 313.
Chrysalis Mimicry, 26.

Clay-slates, a Microscopical Study of
some Huronian, 220.

Cleaning Slides and Cover-glasses, 295.
Coal-measures, on the supposed Radio-
larians and Diatomaceæ of, 255.
Coloured Liquids, Diatoms in, 79.
Colouring Microscopic Preparations,

new Process of, with a Picro-aniline
Solution, 82.

Colours, the Ornamental, of Daphniada,
205.

Commercial Microscopy, 257.
Computation, on the Results of a,
relating to Tolles' Objective, 142.
Congress, the American Microscopical,
253.

Conochilus and Melicerta ringens, the
Mastax-Framework in, 176.

Contractile Vacuoles of the Infusoria,
Physiology of the, 257.
Convergent Light, the Ordinary Mi-

croscope as a Polariscope for, 207, 292.
Conversazione of the Royal Society, 148.
Copepoda, Collecting, 368.

Coral, on a new, Stylaster stellulatus,
and Note on Tubipora musica, 41.
Cover Adjustment for Microscope Ob-
jectives, 251.

Glasses and Slides, Cleaning, 295.
Covering Glass, Thin, 298.
Crisp, Frank, on the Present Con-
dition of Microscopy in England, 121.
Crustacea and Annelida, the Optic Rod
in the, 284.

Crustacean, on an Ostracode, of a new
Genus (Acanthopus), 80.

Crystals, Microscopic, on the Measure-
ment of the Dihedral Angles of, 217,
274.

Curves, Lissajou's, 94, 160.
Cutaneous Glands, 344.

D.

Dallinger, Rev. W. H., on the Measure-
ment of the Diameter of the Flagella of
Bacterium termo, a Contribution to the
Question of the "Ultimate Limit of
Vision" with our present Lenses, 169.
Daphniada, the Ornamental Colours of,
205.

Dark-Field Illumination, a new Device
for, 347.

Death Point, Thermal, of a minute
Septic Organism, Experiments made
to determine its, 203.

Desiccation and Revival, Diatom, 26.
Development and Digestion, Insect, 144.
of Lichens, 346.

and Structure of Sponges, 223.
of the Tentacles in Hydra, Mode
of, 282.

Device, Simple, for the Illumination of
Balsam-mounted Objects, 246.

Diatom Desiccation and Revival, 26.
Parasites on a, 281.
Diatomace of the Arctic Expedition,
the, 375.

Kutzing's, 368.

and Radiolarians, on the sup-
posed, of the Coal-measures, 255.
on some new Genera and Species
of, 237.
Diatomaceen-Kunde, Schmidt's Atlas
der, 357.

Diatomaceous Tests, Balsamed, Method
of Resolving, 45.

Diatoms, Count Castracane on, 152.
in Coloured Liquids, 79.

New, 367.

the Revivification of, 150, 311,
374.

Digestion and Development, Insect, 144.
Digestive Apparatus of Spiders, 199.
Dinamoeba, Feeding of, 216.
Discharge, Electric, in Gases, the Com-
pound Microscope applied to the Ex-
amination of, 287.

Disease, Splenic, Bacteria as Parasites
in, 87.

the Germ Theory of, 221.
Diseases, Typhoid and other Enteric,
on the Detection of Toxic Matter
connected with, 33.
Double Refraction, the Microscope ap-
plied to the Phenomena of, 276.
Dry. Immersion Objectives, 154.

E.

Echinodermata and Turbellaria, Ani-
mals parasitic on, on the Ortho-
nectida, a new Class of, 23.
Electric Discharge in Gases, the Com-
pound Microscope applied to the
Examination of, 287.

Embryology of Sponges, the, 263.
Embryo of Terebella, Wartelia wrongly
considered as the, 355.

England, on the Present Condition of
Microscopy in, 121.

English Microscopes, the Fine Adjust-
ment of, 205.

Enteric, Typhoid, and other Diseases,
on the Detection of Toxic Matter
connected with, 33.

Eozoon, Palæozoic Fossils mineralized

with Silicates, in illustration of, 219.
Escape of small Animals from Aquaria,
280.
Excursion, Marine, of the Birmingham
Microscopical Society, 287.
Exhalation and Inhalation of Aqueous
Vapours by the Leaves, part played
by the Stomata in the, 334.
Exo-skeleton in "Reptilia," a Contri-
bution to the Histology of the, 233.
Eyes of Insects, 225.

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Spider, 26.

Fossils called "Granicones," on the,
233.

Paleozoic, mineralized with Sili-
cates, in illustration of Eozoon, 219.
Freezing Methods, Application of, to
the Microscopic Examination of the
Brain, 358.

French view of the Binocular Micro-
scope, 149.

Frog, Amphiuma tridactylum, and
Man, the Structure of the Coloured
Blood-corpuscles of, 57, 97.

Plate, Improved Form of, 298.
Fungi, the Inversion of Sugar by, 24.
Fungus of the Maple (Rhytisma aceri-
num), 265.

G.

Gases, Electric Discharge in, the Com-
pound Microscope applied to the
Examination of, 287.

Gemmiparous and Fissiparous Repro-
duction of the Noctilucæ. 331.
Geneva, Lake of, on an Ostracode Crus-
tacean of a new Genus (Acanthopus)
met with in the, 80.

Germ Hypothesis of Putrefaction, the,
373.

Theory of Disease, the, 221.
Germinal Matter of the Air, Schulze's
Mode of Intercepting the, 206.
Glands, Cutaneous, 344.

Glass, Optical Constants of, Influence
of Temperature on the, 283.
Glyciphagus plumiger, 209.
Gold Method, on the, 250.
"Granicones," on the Fossils called, 233.
Gulf Stream, Hydroida of the, 223.

H.

Hairs, on the Visibility and Optical
Aspects of, viewed from a Distance,
318.

Haliphysema Tumanowiczii not a
Sponge, 261.

Heliozoon, Apparent discriminative
power in the selection of Food by
a, 215.

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Life, the Phenomena of, Influence of
Repose and Motion in, 345.
Ligula, the Genus, 86.

Limit of Vision, Ultimate, with our
present Lenses, 169, 337.

to the Apertures of Microscopic
Objectives, on a Theoretical, 139.
Limits of Accuracy in Measurement
with the Microscope, 344.

of Microscopic Vision, 379.
Liquids, Diatoms in Coloured, 79.

the Movement of Microscopic
Particles suspended in, 146, 272.
Lissajou's Curves, 94, 160.

Low Temperature, Action of very, on
Bacteria, 25.

M.

Man, Amphiuma tridactylum, and the
Frog, the Structure of the Coloured
Blood-corpuscles of, 57, 97.

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