VI 11 CONTENTS. 
PAGE 
The Movement of Microscopic Particles suspended in Liquids . . 146 
A Test Object for Histologists 148 
On the Rhizopoda of the Salt Lake of Szamosfalva 148 
The Conversazione of the Royal Society on May 1 148 
The Soiree of the Chemical Society 149 
A French View of the Binocular Microscope 149 
The Revivification of Diatoms 150 
A Method of Staining Rapidly 150 
A New Field for the Alicroscopist (the Flagellate Protozoa') .. .. 151 
The Royal Microscopical Society of the Sandwich Lslands .. .. 152 
Count Castracane on Diatoms 152 
The New Oil-immersion Object-glass 153 
Dry V. Immersion Objectives 154 
liibliograpliy 155 
Ib-oceedings of the Society — 
1st May, 1878 159 
Scientific Evening, 15^A May, 1878 162 
5th January, 1878 164 
No. IV. (September). 
].— On the Measurement of tlie Diameter of the Flagella of Bacterium 
termo : n Contribution to the Question of the “ Ultimate Limit of 
Vision” with our present Lenses. By Rev. W. H. Dallinger. 
(Plates VIII. and IX.) 1G9 
II. — The Mastax-Framework in Melicerta ringens and Conochilus, described 
by F. A. Bed well ; with further Notes on these Rotifers. (Plates 
X. and XI.) 176 
HI. — Note on the Eftect produced on P. angulatum and other Test Objects 
by excluding the Central Dioptric Beam of Light. By John Ware 
Stephenson, F.R.A.S., Treas. R.M.S. (Woodcut.) 186 
Notes and Memoranda 188 
A New Organ (?) of the Rotatoria 188 
A Method of Preserving the Rotatoria, Infusoria, ^c., with their 
Organs extended 189 
An Improved Form of Hot Stage. (Woodcut.) 191 
Immersion Paraboloids 192 
Organisms suspended in the Atmosphere 192 
The Foraminifera and Polycystina of the North Polar Expedition 
of 1875-6 194 
On Examining, Preserving, and Photographing Bacteria .. .. 195 
A Aloist Chamber 197 
The “ Zentmayer ” New Patent Microscope 197 
Digestive Apparatus of Spiders 199 
Hooked Spines on the “ Root-fibres ” of British Polyzoa .. .. 200 
A New Postal Box for Slides 201 
A “ New ” Box for Microscopic Slides 201 
Apparatus for resolving Test Objects 201 
