CONTENTS. 
TRANSACTIONS OF TEE SOCIETY. 
PAGE 
I. The Foraminifera of the Gault of Folkestone. — VIII. By Frederick 
Chapman, F.R.M.S. (Plates I. and II.) 1 
II. The President’s Address : Sketches from the Anatomy of the Acarina. 
By A. D. Michael, F.L.S., &c 15 
III. On some New and Interesting Freshwater Algge. By William West, 
F.L.S., and G. S. West, A.R.C.S. (Plates III. and IV.) 149 
IV. On the Male of Stephanoceros Eichorni. By F. R. Dixon-Nuttall, 
F.R.M.S. (Plate V.) .. 166 
V. Notes on the Genus Apsilus and other American Rolifera. By Dr. 
Alfred C. Stokes. (Plate VI.) 269 
VI. Interzooecial Communication in Flustridae, and Notes on Flustra. By 
Arthur William Waters, F.R.M.S, F.L.S. (Plates VII. and VIII.) 279 
VII. On an Addition to the Methods of Microscopical Research, by a new 
Wav of Optically producing Colour-Contrast between an Object and 
its Background, or between Definite Parts of the Object itself. By 
J. Rheinberg. (Plates IX. and X.) 373 
VIII. The Royal Microscopical Society’s Standard Screw-Thread for Nose- 
Piece and Object-Glasses of Microscopes. Being the Report of a Sub- 
Committee, drawn up by Conrad Beck, F.R.M.S. (Fig. 75) .. .. 389 
IX. On the Occurrence of Endocysts in the Genus Thalassiosira. By 
Thomas Comber, F.R.M.S. (Plate XI.) 489 
X. The Foraminifera of the Gault of Folkestone. — IX. By Frederick 
Chapman, A.L.S., F.R.M.S. (Plates XII. and XIII.) 581 
XI. A Simplification of the Method of Using Professor Abbe’s Apertometer. 
By E. M. Nelson, F.R.M.S 592 
XII. Photomicrographic Camera, designed chiefly to illustrate the Study of 
Opaque Objects, more especially in the Study of Palaeo-Botany. By 
J. Butterworth, F.R.M.S. (Plates XIV. and XV.) 595 
SUMMARY OF CURRENT RESEARCHES 
RELATING TO ZOOLOGY AND BOTANY (PRINCIPALLY INVERTEBRATA AND 
Cryptogamia), Microscopy, &c., including Original Communications 
from Fellows and Others.* 27, 167, 293, 393, 492, 597 
ZOOLOGY. 
VERTEBRATA. 
a. Embryology. 
Rohde, F . — Present State of the Question as to the Origin and Inheritance of 
Acquired Characters 27 
Minot, C . — Heredity and Rejuvenescence 28 
Herbst, Curt — Formative Stimuli in Development 29 
Wagner, F. v. — Hertwig's Theory of Development 29' 
Rvder, J. A . — Dynamical Hypothesis of Inheritance •• 60 
Sedgwick, A. — Further Remarks on the Cell-Theory •• 62 
* In order to make the Contents complete, the papers printed in the ‘ Transactions ’ 
and the notes printed in the Proceedings’ are included here. 
