CONTENTS. 
XI 
PACK 
Improved Form of Fr'og-platc 298 
Variation in Spongilla fluviatilis 299 
Borax in Vegetable Physiology 299 
The Vernier applied to the Microscope 299 
Micro-photograph ^00 
Bibliography 
Proceedings of the Society — 
Mh October, 1878 307 
No. VI. (December). 
I. — On a Species of Acarus, believed to be new to Britain. By A. D. 
Michael, F.R.M.S. (Plate XVI.) 313 
II__On the Visibility and Optical Aspects of Hairs viewed from a Distance. 
By Henry J. Slack, F.G.S., President R.M.S 318 
HI. — On the Measurement of the Angle of Aperture of Objectives. By 
F. H. Wenham, F.R.M.S 321 
IV. — Improvements in the Micro-spectroscope. By F. H. Ward, M.R.C.S., 
F.R.M.S. (Plate XVII.) 326 
Notes and Memoranda 331 
The Gemmiparous and Fissiparous Reproduction of the JSfoctilucce 
{Noctiluca miliaris, Suriray) 331 
The Functions of Leaves. Part played by the Stomata in the Exha- 
lation and Inhalation of Aqueous Vapours by the Leaves .. .. 331 
Staining for the Central Nerve System 336 
“ Ultimate Limit of Vision^' 337 
The Aninuil of Millepora alcicornis 310 
Liberation of the Zoospores, Antherozoids, tj-c., in the Lower Plants 312 
CEcistes pilula .' 343 
Cutaneous Glands 311 
“ Limits of Accuracy in Aleasurement xvith the Microscope ” . . 311 
S'' The Influence of Repose and Motion in the Phenomena of Life . . 315 
Development of Lichens 316 
Microscopical Study of the Ashes of Leaves 316 
A New Device for Dark-Field Illumination 317 
The Termination of the Nerves in the Striated Muscles 318 
Observations on Saprolegniece 319 
Life-History of Bacterium termo and Micrococcus 350 
Life-History of Spirillum 352 
Observation of Live Aquatic Animals 353 
Unit of Alicrometry 353 
The proposed Micro-Metric Unit 351 
Wartelia, a new Genus of Annelida, wrongly considered as the 
Embryo of Terebella 355 
Hyalodiscus subtilis (Bailey) 356 
SchmidCs Atlas der Diatomaceen-Kunde 357 
Application of Freezing Methods to the Microscopic Examination 
of the Brain 358 
