INDEX. 
285 
P. 
Palmodictyon viride in Britain, 29. 
Peronospora, Is it the cause of the 
American Onion Blight ? 246. 
" Personal Equation " in Microscopy, 
243. 
Pigment-cells, how they are influenced 
by the Nerves. By M. Pouchet, 168. 
Pigment-flakes, Pigmentary Particles, 
and Pigment - scales. By Dr. G. 
ElOHARDSON, 19. 
PiGOTT, Dr. KoYSTON-, F.K.S., on the 
Invisibility of Minute Refracting 
Bodies caused by Excess of Aperture, 
and upon the Development of Black 
Aperture Test-Bands and Diffraction 
Eings, 55. 
on the Principle of testing 
Object-glasses by Miniatures of Illu- 
minated Objects examined under the 
Microscope, especially of Sun-lit Mer- 
curial Globules ; and on the Develop- 
ment of Eidola or False Images, 147. 
Plowright, Charles B., Some Re- 
marks upon Sphseria morbosa, 209. 
Polariscope and Lantern, a Micro-, 264. 
Poppy Fungus, the, 244. 
Pouchet, M., How Pigment-cells are 
influenced by the Nerves, 168. 
Powers, the Advantages of High and 
Low, 174. 
President, the Address of the, 97. 
Probe-Platte, Measurements of the 
MoUer. By J. Edwards Smith, 
Esq., 240. 
Proceedings op Societies : — 
Academy of Natural Sciences, Phila- 
delphia, 280. 
Medical Microscopical Society, 40, 
93, 139, 273. 
Memphis Microscopical Society, 43, 
183, 277. 
Microscopical Society of Victoria, 
42, 179. 
Quekett Microscopical Club, 95, 139, 
184. 
Royal Microscopical Society, 35, 91, 
135, 175, 226, 268. 
San Francisco Microscopical Society, 
278. 
South London Microscopical Club, 
228, 275. 
South Australian Microscopical Club, 
277. 
R. 
Refracting Bodies caused by Excess of 
Aperture, on the Invisibility of 
Minute, and upon the Development 
of Black Aperture Test-Bands and 
Diffraction Rings. By Dr. Royston- 
Pigott, 55. 
Rhizopods, New Species of. By Pro- 
fessor Leidy, 86. 
the Amoeban, Actinophryan, and 
Difllugian. By Dr. Wallich, 210. 
Richardson, Dr. Joseph G., on Pig- 
ment-flakes, Pigmentary Particles, 
and Pigment-scales, 19. 
Note on the Diagnosis of 
Blood Stains, 213. 
Rotifers, on some Male. By C. T. 
Hudson, LL.D., 45. 
S. 
Saes, Dr. G., on the Dimorphic De- 
velopment of the Cladocera, 244. 
Schmidt, Dr. H. D., on tlie Develop- 
ment of the Smaller Blood-vessels in 
the Human Embryo, 1. 
Screw, the Society's Universal, 33. 
Slack, Mr. H. J., Translations from 
Papers of Von Baer, Lacaze-Duthiers, 
and Alf. Giard, on B. polymorphus 
and B. Haimeanus, 141. 
on Angle of Aperture in 
Relation to Surface Markings and 
Accurate Vision, 233. 
"Slit," on a Modification of the, for 
Testing Angle. By Robert B. 
Tolles, 21. 
Small-pox, the Lymph of, 254. 
Smith, Mr. J. (U.S.A.), on the Illumi- 
nation of Difficult Test-objects : the 
Use of Blue Glass, 88. 
J. Edwards, Esq., Measurements 
of the Moller Probe-Platte, 240. 
SoRBY, H. C, F.R.S., on New and 
Improved Microscope Spectrum Ap- 
paratus, and on its Application to 
various Branches of Research, 198. 
Soundings, the ' Challenger.' By Dr. 
Wyville Thomson, 245. 
Spectrum Apparatus, on New and 
Improved Microscope, and on its 
Application to various Branches of 
Research. By H. 0. Sorby, F.R.S., 
198. 
SphjBria morbosa, 118. 
some Remarks upon. By 
Charles B. Plowright, 209. 
Sphagnum intermedium, 61. 
cuspidatum, 63. 
laricinum, 229. 
Pylaiei, 231. 
Sponges, the Microscopic Anatomy of, 
167. 
T. 
Taylor, Thomas, on certain Fungi 
Parasitic on Plants, 118. 
Teeth, Development of the, in Reptilia 
and Batrachia, 85. 
