CONTENTS. 
Transactions op the Society — page 
I. The President’s Address : The History of the Royal Microscopical 
Society. By A. D. Michael, F.L.S., &c. 1 
II. A New Erecting Camera Lucida. By Edward M. Nelson, F.R.M.S. 
(Figs. 1-3) 21 
III. A Portable Microscope by J. Zentmayer of Philadelphia. By Edward 
M. Nelson, F.R.M.S. (Figs. 4 and 5) 26 
IY. Monochromatic Violet. By J. William Gifford, F.R.M.S. (Plate I.).. 145 
V. On the Variations observed in large Masses of Turbinaria. By F. 
Jeffrey Bell, M.A., Sec. R.M.S. (Plates II. and III.) 148 
VI. Patents connected with the Microscope. — 1666-1800. By W. H. Brown, 
Assistant-Secretary R.M.S. (Plates IV. and V.) 257 
VII. On the Form and Proportions of the Brain in the Oribatidse and in some 
other Acarina. By A. D. Michael, President R.M.S., F.L.S. With a 
Note by E. M. Nelson, F.R.M.S. (Plate VI.) 274 
VIII. Some Details of the First Nuclear Division in the Pollen-Mother-Cells 
of Lilium Martagon L. By Ethel Sargant. Communicated by D. H. 
Scott, Ph.D., F.R.S., F.R.M.S. (Figs. 42-51) 283 
IX. Notes on the Podura Scale. By Alfred Letherby, F.R.M.S. (Plate VII.) 397 
X. Development of the Young Valve of Trachyneis aspera Cleve. By 
Thomas Comber, F.R.M.S., F.L.S. (Plate VIII.) 400 
XI. On the Anatomy of Nyctotherus ovalis. By Wm. Cecil Bosanquet, 
M.A., Fellow of New College, Oxford. (Plate IX.) 404 
XII. On the Division of the Chromosomes in the First Mitosis in the Pollen- 
Mother-Cell of Lilium. By Prof. J. Bretland Farmer, M. A. (Plate X.) 501 
Summary op Current Researches relating to Zoology and Botany (prin- 
cipally Invertebrata and Cryptogamia), Microscopy, &c., including 
Original Communications from Fellows and Others.* 
29, 150, 288, 407, 505, 609 
ZOOLOGY. 
Vertebrata : — Embryology, Histology, and General, 
a. Embryology. 
PAGE 
Sedgwick, A. — Inadequacy of Cellular Theory of Development 29 
Zoja, R.— Experimental Embryology 30 
Manton, W. O . — Human Embryology 30 
Jacoby, M. — Development of Primordial Cranium in Man 30 
Mertens, H. — Vitelline Body of BaTbiani 31 
Buhler, A . — Oogenesis in the Babbit and the Medullary Strands of the Ovary in 
Fox and Man 31 
Saint-Remy, G. — Anterior Extremity of Notochord in higher Vertebrates 31 
Mazzarelli, G. — Origin of Sympathetic System 31 
Langer, A . — Bulbus Cordis in Birds and Mammals 32 
Leighton, V. L. — Development of Wing of Sterna Wilsoni 32 
Field, H. H. — Notes on Development of Amphibia 32 
Harrison, R. G. — Origin of Bones of Teleosteans 32 
* In order to make the Contents complete, (1) the papers printed in the ‘ Trans- 
actions,’ (2) the abstracts of the ‘Bibliography,’ and (3) the notes printed in the 
‘ Proceedings ’ are included here. 
