13 
GEOLOGY, Etc. 
PAGK 
Part, G. M. — Ordovician Lavas of N. Pembrokeshire 43d 
Larsen, E. S . — Microscopic Determination of Non-opaque Minerals 439 
ULTRAMICROSCOPY, COLLOIDS, Etc. 
Bradford, S. C. — Colloids, or the Material of Life 439 
Hatschek, E. — Diffusion in Deformed Gels 439 
Mukherjee, J. N., & B. C Papaconstantinou — The Kinetics of Coagulation . . 439 
Murray, H. D. — Size of Colloid Particles and Adsorption of Electrolytes . . .. 439 
Porter, A. W., & J. J. Hedges — Distribution of Particles in Colloidal Suspensions 439 
NOTICES OF NEW BOOKS. 
Kofoid, Charles Atwood, & Olive Swezev — 77ie Free-living Unarmoured 
Dinoflagellata 440 
PROCEEDINGS OF THE SOCIETY. 
Conversazione, Oct. 11, 1922 442* 
Meeting, Ocfc. 18, 1922 445 
„ Nov. 15, 1922 447 
Authors of Papers printed in the Transactions are entitled to 25 copies of their 
communications gratis. Extra copies can be had at moderate charges on application 
to the Secretary. 
ROYAL MICROSCOPICAL SOCIETY. 
LIST OF ORDINARY MEETINGS AND OTHER FIXTURES 
to be held at 20 HANOVER SQUARE, LONDON, W.l 
at 7.30 P.M. 
Wednesday, Jan. 17, 1923 
Annual Meeting for Election 
of Council and Officers. 
„ Feb. 21, 1923 
,, Mar. 21, „ 
„ Apr. 18, „ 
Wednesday, May 16, 1923 
May 23, „ 
Annual Pond Life Exhibition. 
7.30 to 10 p.m. 
June 20, 1923 
