624 
NATURE 
[May 5, 1923 

pharynx intermedia inhabits the pelvic flexure and 
dorsal colon of the host, of which it is one of the 
commonest parasites, and Habyonema zebre occurs 
in fairly large numbers in the stomach.—Sir Thomas 
Muir: Note on Zeipel’s condensation-theorem and 
related results. Both Zeipel’s papers on deter- 
minants are now over fifty years old and have been 
somewhat neglected. One or two of the basic 
results of Zeipel’s first paper are discussed and a 
number of deductions that cluster somewhat pictur- 
esquely round them. 

Official Publications Received. 
Mysore Agricultural Calendar, 1923. Pp. iii+54. (Bangalore : Govern. 
ment Press.) 1 anna. 
The Journal of the Royal Agricultural Society of England. Vol. 83. 
Pp. 8+260+exlviii+24. (London: J. Murray.) 15s. 
Thirty-fourth Annnal Report of the Bureau of American Ethnology to 
the Secretary of the Smithsonian Institution, 1912-13. (With accom- 
panying paper, “‘A Prehistoric Island Culture Area of America,” by 
J. Walter Fewkes.) Pp, 281+120 plates. (Washington: Government 
Printing Office.) 
Report of the Board of Commissioners of Agriculture and Forestry of 
the Territory of ‘Hawaii for the Biennial Period ended December 31, 
1922, Pp. vi+102+16 plates. (Honolulu, Hawaii.) 

Diary of Societies. 
SATURDAY, May 5. 
Roya INsTiITUTION OF GREAT Britain, at 3.—Dr. L. L. B. Williams: 
The Physical and Physiological Foundations of Character (2). 
MONDAY, May 7. 
Royat Instirvrion or GREAT BRITAIN, at 5.—General Meeting. 
Society or ENGINEERS, Inc. (at Geological Society), at 5.30,—P. Mauclére : 
Pneumatic Handling of Petrol and other Inflammable Liquids. 
ARISTOTELIAN Sociery (at University of London Club, 21 Gower Street), 
at 8.—L. J. Russell: Some Points in the Philosophy of Leibniz. 
Roya Socrery or Arts, at 8.—S. 8. Cook: The Development of the 
Steam Turbine (2). (Howard Lecture.) 
Surveyors’ Institution, at 8.—C. H. Bedells: Some Functions of a 
Surveyor under the Settled Land Acts 1882-1890, and Part II. of the 
Law of Property Act, 1922. 
RoyaL GroorapuivaL Society (at olian Hall), at 8,30.—F. Kingdon 
Ward : The Tibetan Border ; Yangtse to Irrawaddy. : 
Royat Society or Meprcine (Tropical Diseases and Parasitology Section) 
(Annual General Meeting), at 8.30.—Lt.-Col. A. E. Hamerton: The 
Establishment of an Anti-rabic Institute in the Tropics. 
TUESDAY, May 8. 
Roya InstiruTion or GREAT Britain, at 3.—Prof. A. C. Seward: The 
Ice and Flowers of Greenland. 
INSTITUTION OF PETROLEUM TECHNOLOGISTS (at Royal Society of Arts), 
at 5.30.—W. A. Guthrie: Heavy Grade Egyptian Crude Petroleum. 
Zoorocicar Society oF Lonpon, at 5.30.—The Secretary ; Exhibition of 
Photographs of Big Game from Choma, Northern Rhodesia.—Miss 
L, E. Cheesman : (1) Exhibition of Living Specimens of Peripatus from 
Trinidad. (2) Exhibition of Section of a Nest of the Stingless Bee 
from Australia.—H. Burrell: Note on a Hibernating Female Specimen 
of the Marsupial Acrobates pyqmeus.—F. Martin Dunean: The Micro- 
scopic Structure of Mammalian Hairs.—I. The Hairs of the Primates. 
Royat Society or Mevicine (Psychiatry Section), at 5.30.—Annual 
General Meeting. 
British Psycwonocicat Society (Education Section) (at London Day 
Training College), at 6.—R. R. Dobson: Mental Tests. 
RoyaL PxHoroorapuic Society or Great Brirar (Scientific and 
‘echnical Group), at 7.—E. Kilburn Scott: The Pioneer Work of Le 
Prince in Moving Pictures. 
pace Microscopicat Cius, at 7.30.—R. Paulson: Fungi and Birch 
Trees, 
WEDNESDAY, May 9. 
Roya CoLLeGE oF SuRGEONS oF ENGLAND, ‘at 5.—Prof. G. Keyues: 
Chronic Mastitis. 
Royat Soctety or Mepictne (Surgery : Sub-section of Proctology) (Annual 
General Meeting), at 5.30.—Sir Humphry Rolleston, Sir Thomas Horder, 
W. E. Miles, P. Lockhart-Mummery, Prof. L. 8. Dudgeon, Dr, W. E. 
Carnegie Dickson, and Dr. A. F. Hurst: Discussion on Ulcerative 
Colitis. : 
INSTITUTE OF PuHysics (at Institution of Electrical Engineers), at 5.30.— 
Dr. J. W. Mellor: The Application of Physics to the Ceramic Industry. 
INSTITUTION OF AUTOMOBILE ENGINEERS, at 7.30.—Col. R. E. Crompton : 
The Effect of Motors on Roads. 
Roya Society or Arts, at 8.—Prof. W. A. Rone: Recent Developments 
in Surface Combustion, with Special Reference to Recent Developments 
in Radiophragm Heating. 
THURSDAY, May 10. 
TRON AND STEEL InsTITUTE (at Institution of Civil Engineers), at 10 a.m.— 
Report.—Presentation of Bessemer Medal to Dr. W, H. Maw.—E, k. 
Sutcliffe and E. C. Evans: The Reactivity of Coke as a Factor in the 
Fuel Economy of the Blast Furnace.—F,. Clements ; British Steel Works 
NO. 2792, VOL. 111] 

Gas Producer Practice. —J. EB, Fletcher: Some Characteristics of 
Moulding Sands and their Graphical Representation.—J. H. Whiteley 
and A. Braithwaite : Some Observations on the Effect of Small Quantities 
of Tin in Stvel.—L. Northcott: Note on Temper Carbon.—J. W. 
Landon: Change of Density of Iron due to Overstrain. 
Iron AND Steet [Nstirute (at Institution of Civil Engineers), at 2.80.— 
Prof. H, C. H. Carpenter: The Production of Single Metallic Crystals 
and some of their Properties.—Prof. J. ©. Arnold: The Co-relation of 
the Chemical Constitutions of “True Steels" to their Micrographic 
Structures.—D. Hanson and J, R. Freeman: The Constitution of the 
Alloys of Iron and Steel.—T. F. Russell; The Potential Energy of Cold 
Worked Steel.—F. C. Thompson and A. Goffey: The Changes in Iron 
and Steel below 400° C.—L. E Benson and F.C. Thompson: Some 
Experiments on Grain-growth in Iron and Steel. 
Roya InstiTuTION oF GREAT BrRiTAIN, at 3.—Prof. J. T. MacGregor- 
Morris : Modern Electric Lamps (3); Glowing Gases (Neon Lamps). 
Royat Socrery, at 4.30.—Prof. A. Fowler: The Series Spectrum of 
Trebly-ionised Silicon (Si [V).—Sir)Robert Robertson and W. EB. Garner: 
Calorimetry of High Explosives.—Dr. H. 8. Hele-Shaw: Stream Line 
Filter.—Dr. F. W. Aston: A Critical Search fora Heavier Constituent: of 
the Atmosphere by means of the Mass-Spectrograph.—Prof. H. E. 
Armstrong: Electrolytic Conduction; sequel to an attempt (1886) to 
apply a Theory of Residual Attinity.—Prof. H. E. Armstrong: The 
Origin of Osmotic Effects. IV. Hydrono-dynamic Change in Aqueous 
Solntions.—Prof. R. W. Wood and A. Ellett : The Influence of Magnetic 
Fields on the ,Polarisation of Resonance Radiation.—W. G. Palmer: A 
Study of the Oxidation of Copper and the Reduction of Copper Oxide 
by a new Method.—E., A. Fisher: Some Moisture Relations of Colloids. 
ae Further Observations on the Evaporation of Water from Clay and 
Wool, 
Roya Society or Mepicine (Neurology Section), at 5.—Annual General 
Meeting, to be followed by a Clinical Meeting. 
InsTITUTION OF ELECTRICAL ENGINEERS, at 6.—Dr. J. A. Fleming: Prob- 
lems in Telephony, Solved and Unsolved (fourteenth Kelvin Lecture). 
Optic 1 Socrety (at Imperial College of Science and Technology), at 7.30. 
—Dr. J. W. French : Stereoscopy restated. 
CHEMICAL Socrery (at Institution of Mechanical Engineers), at 8.—Prof. 
W. H. Perkin: Adolph von Baeyer Memorial Lecture. 
FRIDAY, May 11. 
Iron anp Steet Institute (at Institution of Civil Engineers), at 10.— 
Announcement of award of the Andrew Carnegie Research Scholarship. 
—C, A. Ablett: Economic Principles governing the Use of Blectrical 
Power in Iron and Steel Works.—T. P, Colclough: The Constitution of 
Basic Slags—its Relation to Furnace Reactions.—Prof. C. H. Desch 
and A. T. Roberts: Some Properties of Steels containing Globular 
Cementite.—K. Honda and T. Murakami: The Structural Constitution 
of Iron-Carbon-Silicon Alloys.—T. Matsushita : Some Investigations on 
the Quenching of Carbon Steels.—E. J. L. Holman: Note on a Value 
for the Surface Tension of Iron Sulphide. 
Tron AND Steet Instirute (at Institution of Civil Engineers), at 2.80.— 
C A. Edwards and C. R. Austin: A Contribution to the Study of 
Hardness.—F. C. Langenberg: An Investigation of the Behaviour of 
Certain Steels under Impact at Different Temperatures.—J. Stead : 
The Cold Working of Steel with Reference to the Tensile Test.—J. J. A. 
Jones: The Ac] Range in Alloy Steels.—C. R. Austin : Some Mechanical 
Properties of a Series of Chromium Steels.—H. O'Neill: Variation of 
Brinell Hardness Number with Testing Load. 
Royat. AstRonomica Socrery, at 5. 
PuystcaL Sociery or Lonpon (at Imperial College of Science and 
Technology), at 5.—J. H. Jeans: The Present Position of the Radiation 
Problem (Eighth Guthrie Lecture). 
Roya. Soctery or Mepicine (Clinical Section), at 5.30.—Annual General 
Meeting. : 
Britisu PsycHo.oaicay Society (Hstheties Section) (at Bedford College), 
at 5.30.—Prof. C. W. Valentine: The Place of Imagery in the Apprecia- 
tion of Poetry. 
MALACOLocIcaL Society or Lonpon (at Linnean Society), at 6. 
Juntor [NstiTUTION OF ENGINEERS, at 7.30.—W. F. C. Cooper: The Theory 
of Resistance to the Flow of Gases and Fluids in Pipes (Durham Bursar’s 
Lecture), 
Roya Institution OF GREAT BRITAIN, at 9.—Prof. W. A, Bone: Gaseous 
Combustion at High Pressures, 
PUBLIC LECTURES. 
MONDAY, May 7. 
IMPERIAL COLLEGE OF ScreNcE AND TECHNOLOGY, at 5.15.—Prof. W. de 
Sitter: Problems of Fundamental Astronomy. - 
TUESDAY, May 8. 
University Cotter, at 5.—Prof. H. R. Kruyt: The Electric Charge of 
Colloids.—At 5.30.—J. H. Helweg: Danish Scenery, ‘ 
Kino’s Cou.ece, at’ 5.30. — Prof. H. Wildon Carr: Blaise Pascal: 
Tercentenary of his Birth, June 19, 1923 (1) (succeeding Lectures on 
May 15, 22, and 29). r 
BrrkBEcK COLLEGE, at 6.—Sir Richard Gregory : The Worth of Science. 
WEDNESDAY, May 9. 
University Couiecr, at 5.15.—Sir Thomas H. Holland: Phases of Indian 
Geology (succeeding Lectures on May 23 and 30), 
THURSDAY, May 10. 
St. Mary's Hospitat (Institute of Pathology and Research), at 4.30.— 
Dr. H. H, Dale: The Physiology of Insulin. ate Mh. 
Kine’s Couieor, at 5.30.—Principal L. P. Jacks: Reality in Religion and 
Education (Hibbert Lecture). 
FRIDAY, May 11. 
Scsoor or OrrenTAL Srupies, at 5.—Dr. P. Giles : The Aryans (sneceeding 
Lectures on May 25 and June 8. 
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