384 
Department of Fisheries, Ceylon. 
Vol. 1, Bulletins 1-3. 
(Colombo.) 
Forest Bulletin No. 48 : Note on Kindal or Hongal (Terminalia paniculata, 
W.andA.). By R.S. Pearson. Pp. 12. (Caleutta : Government Printing 
Office.) 6 annas, 
Forest Bulletin No. 52: Classification of Thinnings. Pp. 5+7 plates. 
(Calcutta : Government Printing Office.) 6 annas. 
Department of Agriculture and Natural Resources: Weather Bureau. 
Aunual Report of the Weather Bureau for the Year 1919. Part 4: Hourly 
Results of the Observations made at the Magnetic Observatory of Antipolo, 
near Manila, P.I., during the Calendar Year 1919. Pp. 47. (Manila: 
Bureau of Printing.) 
The Journal of the Institute of Metals. 
Vol. 28. Pp. ix+1010. 

Bulletins of the Ceylon Fisheries, 
Edited by Dr. J. Pearson. Pp. iv+134, 
Edited by G. Shaw Scott. 
(London : 36 Victoria Street.) 31s. 6d. net, 

Diary of Societies. 
SATURDAY, Marca 17. 
British Myco.osicat Society (in Botany Department, University 
College), at 11.—Rev. P. J, Alexander; An Ecological and Phenological 
Account of the Mycetozoa of Surrey.—Miss M. H. Carré, Dr. A. 8, 
Horne, Miss H. M. Judd, and Mrs. H. 8. Williamson: Hidamia.— 
Dr. J. S. B. Elliott and Miss O. Stansfield: The Life History of 
Polythrincium Trifolii Kunze.—J. Ramsbottom : (1) The Correspondence 
of Berkeley and Broome ; (2) Mycology at the British Empire Exhibi- 
tion (1924). 
Roya InstituTiION oF Great Britaty, at 3.—Sir Ernest Rutherford: 
Atomic Projectiles and their Properties (5). 
MONDAY, Marcu 19. 
RoyaL GEOGRAPHICAL Society (at Lowther Lodge, Kensington’ Gore), 
at 5.—Col. M. N. MacLeod, Squadron-Leader F. C. VY. Laws, and Major 
Griffiths : Recent Developments of Air Photo-topography. 
INSTITUTION OF ELECTRICAL ENGINEERS (Informal Meeting), at 7.—H. T. 
Young and others: Discussion on the Need for Co-operation between 
Electrical Manufacturers and Contractors. 
InSrITUTION OF MECHANICAL ENGINEERS (Graduates’ Section), at 7.— 
R. C. Bond; The Walschaert Locomotive Valve-gear. 
Roya INstirvre oF Brirish ArcHiTects, at 8.—G. E. 8. Streatfeild: 
The Hammersmith Housing Scheme. 
ARISTOTELIAN Society (at University of London Club), at 8.—Miss H. D. 
Crested and others: Discussion on Prof. Wildon Carr's A Theory of 
onads. 
Roya Society or Arts, at 8.—J. EH. Sears, jun.: Accurate Length 
Measurement (3) (Cantor Lecture). 
CxremicaL InpusTRY CLUB (at Whitehall Court), at 8. 
TUESDAY, Marcu 20. 
Roya. InstitUTION oF GREAT BRITAIN, at 3.—Lecture: Diseases of the 
Prehistoric Britons. 
Roya. Society or Mepicing, at 5:—General Meeting. 
Royat CoLLeGe OF Puysicians oF Lonpon, at 5,—Dr. A. J. Hall: 
Encephalitis Lethargica (Epidemic Encephalitis) (2) (Lumleian 
Lecture). 
Roya Sraristicar Society, at 5.15. 
NEwcoMEN Socrery (at Prince Henry's Room, 17 Fleet Street), at 5.30.— 
D. Brownlie: The Early History of the Gas Process. 
LysTITUTE oF TRaNsPoRT (at Institution of Electrical Engineers), at 
ee on Town-planning and Re-modelling in Relation to 
raffic. 
ZooLocicau Society or Lonpon, at 5,30.—Snshil Ch. Sarkar: A Com- 
parative Study of the Buccal Glands and Teeth of Opisthoglyph Snakes, 
and a Discussion on the Evolution of the Order from Aglypha.—O, 
Thomas and M. A. ©, Hinton: The Mammals obtained in Darfur by the 
Lynes-Lowe Expedition.—R. I, Pocock ; (1) The External Characters of 
Elaphurus, Hydropotes, Pudu, and other Cervide ; (2) The Classification 
of the Seiurid. 
INSTITUTION OF CivIL ENGINEERS, at 6, 
InsTITUTE or MARINE Enoineers, INc., at 6,80.—J. Lamb; Operation of 
the Marine Diesel Engine—Cylinders and Pistons. 
Royat PuoroaraPHic Society or GREAT Britain (Scientific and 
Technical Group), at 7.—W. F. A. Ermen: The Preparation of Metol 
and its Homologues, 
Mepico-Leaat Society (at Medical Society of London), at 8.30—Dr. 
H. A. Burridge and others: Diseussion on State Effort to rescue 
Drug Victims, with special reference to the Dangerous Drugs Act. 
WEDNESDAY, Marcu 21. 
InsTITUTION OF NAVAL Arcurrecrts (at Royal United Service Institution)» 
at 11.—Sir Eustace T. d'Eyncourt and J. H. Narbeth: A Proposed 
Aircraft-carrying Mail Steamer,—Sir John E. Thornyeroft and Lieut. 
Bremner : Coastal Motor Boats in War-time.—At 3.—A. C. F. Henderson : 
Remarks on Some of the Present-day Problems in the Design of Ships. 
Women’s ENGINEERING Soctery (at 26 George Street, W.1), at 6.15.—Dr, 
R. 8. Hutton: Scientific Studies of Manual Work (Motion Study and 
Vocational Training). 
Roya MicroscopicaL Sociery (Industrial Applications Section), at 7.— 
B. Hatschek : The Standard Methods of Ultra-microscopy.—Dr. A. C. 
Thaysen : The Destruction of Cotton and other Fabrics by Bacteria, and 
the Importance of the Microscope in the Study of this Destruction. 
RoyaL MeETKoroLoarcaL Socrery, at 7.80.—G. M. B. Dobson: The 
Characteristics of the Atmosphere up to 200 km., as obtained from 
Observations of Meteors. 
NO. 2785, VOL. 111] 
NATURE 
[Marcu 17, 1923 ’ 



Rovat Society oF Arts, at 8.—Dr. F. W. Edridge-Green: Some Curious 
Phenomena of Vision and their Practical Importance. 
ENTOMOLOGICAL Society oF Lonpon, at 8. 
Roya. Society oF MepiciNe (Social Evening), at 9.—Dr, H. C. Cameron : 
The Mystery of Lord Byron’s Lameness. 
THURSDAY, Marcu 22. 
INSTITUTION OF NAVAL ARCHITECTS (at RoyalUnited Service Institution), — 
at 11.—The Hon. Sir Charles A. Parsons, 8. 8. Cook, and H. M. Duncan; — 
Mechanical Gearing.—W. Le Roy Einmet: Electric Ship Propulsion. — 
At 3.—G. 8. Baker and W. C. 8S. Wigley : Model Screw Propeller Experi- 
ments with Mercantile Ship Forms. At8.—K.C. Barnaby : The Powering 
of Motor Ships. : 
Royat Inst1TUTION OF GREAT BRITAIN, at 3.—Lt.-Col. BE. F. Strange: 
Japanese and Chinese Lacquer (2). 
Roya Socrery, at 4.30.—G. Hewett: The Dusuns of British North 
Borneo.—L. T. Hogben and F. R. Winton: The Pigmentary Effector 
System. III. Colour Response in the Hypophysectomised Frog.—H. 
R. Hewer: Studies on Amphibian Colour Change.—J. Walton: On 
Rhbexoxylon, Bancroft. A Triassic Genus of Plants exhibiting a Liane- 
type of Vascular Organisation.—Margaret Tribe: The Development of 
the Hepatic Venous System and the Postcaval Vein in the Marsupialia. 
—J. Gray : The Mechanism of Ciliary Movement. III. The Effect of 
Temperature.—E. Ponder; The Inhibitory Etfect of Blood Serum on 
Hemolysis. : 
Rovat COLLEGE oF Paysicians oF Lonpon, at 5.—Dr. A. J. Hall: — 
pret! Lethargica (Epidemic Encephalitis) (3) (Lumleian 
Lecture). 
FELLOWSHIP OF MEDICINE (at Royal Society of Medicine), at 5.30.—Dr, H. 
W. Barber: The Investigation of certain. Diseases of the Skin in the 
Light of Recent Research. 
CuiLp-Stupy Socrery (at Royal Sanitary Institute), at 6.—Dr, H. C. 
Miller ; The New Discipline. 
OpticaL Society (at Imperial College of Science and Technology), at 7.30. — 
—Dr. L. C. Martin: Surveying and Nautical Instruments from an — 
Historical Stand point, 
Camera Cuus, at 8.15.—T. Bell: Portraiture. 
Royat Society or Mepicrne (Urology Section), at 8.80.—S. Joly: 
Diverticulum of the Bladder with special reference to Operative Treat- 
ment, 
FRIDAY, Marca 23. 
InsTITUTION OF NAVAL ARCHITECTS (at Royal United Service Institution), 
at 11.—Prof. T. Bs-Abeli: The Behaviour of Stiffened Thin Plating 
under Water Pressure.—Dr. J. Montgomerie: Further Experiments on 
Large-size Riveted Joints.—J. Anderson: The Influence of Form upon 
the Stability and Propulsion of Passenger Ships.—At 3.—W. Thomson : 
The Effect of Variations in Loading on Longitudinal Structural Stresses 
in Ships.—E. V. Telfer: Graphical Trim Calculation and a Trim 
Nomogram. b 
AssocIATION oF Economic Broxoaists (in Botany Theatre, Imperial 
College of Science and Technology), at 2.30.—-Prof. J. H. Priestley: 
The Causal Anatomy of the Potato Tuber.—E. H. Richards: Cellulose — 
Decomposition: its Control and Applications. 
PuysicaL Society oF Lonpon (at Imperial College of Science and — 
Technology), at 5.—Dr, W. J. H. Moll: A Moving-coil Galvanometer 
of Rapid Indication.—Dr, W. J. H. Moll : A Thermopile for measuring — 
Radiation.—Capt. C. W. Hume: Aberration and the Doppler Effect on 
the Theory of Relativity;—and the following Experimental Demon- 
strations :—C. R. Darling and the Hon. F. W. Stopford: The Produe- 
tion of E.M.F.’s by Heating Junctions of Single Metals.—R. H. 
Humphry: The Donble Refraction due to Motion in a Vanadium 
Pentoxide Sol, and some Applications. 
Junior LystiTUTION OF ENGINEERS, at 7.30.—R. J. Siddall; History and 
Development of the Underground Railway, 
Roya PHoToGRAPHIC Sociery oF GREAT BRITAIN, at 8.—F. G. Newmarch : 
A Tramp through Corsica, 
Roya InstiruTION OF GrEaT Britain, at 9.—Sir Ernest Rutherford : 
Life History of an Alpha Particle from Radium. 
SATURDAY, Marcw 24. 
Royav InsriruTion or GREAT Briain, at 3.—Sir Ernest Rutherford : 
Atomic Projectiles and their Properties (6). 4 
British PSycnoLocicat Socrery (at King’s College), at 3.15.—Miss Mary F 
Sturt: The Estimate of Duration. 
PUBLIC LECTURES. 
SATURDAY, Marcu 17. : ; 
¢ 
Horniman Museum (Forest Hill), at 3.30.—Dr. A. Abram; Travelling 
in the Middle Ages. 
TUESDAY, Marca 20. 
ScHoot or OntenTaL Stupies, at 5.—Sheikh Abd el Razek: The Study 
in Europe of Moslem Civilisation. 
WEDNESDAY, Marcu 21. 
Roya Institure oF British ARCHITECTS, at 5.—Lord Sumner of Ibstone: 
The Public and the Architect. 
SATURDAY, Marcu 24. - 
Horniman Museum (Forest Hill), at 3.30.—Dr. W. A. Cunnington ; The 3 
Natural History of Lobsters and Prawns. + 
