852 



NATURE 



[December 8, 1923 



p. G«ub«rt : The detonnination of minerals by the 

 microacopical examination of the streak left on a 

 hanl boay. The microscopical examination of the 

 streak produced on a plate of ground gla»i» or <iii.irtz 

 can be used as a means of rapid idciitii a 



mineral or of its constituents. It has i m- 



t.i^je of using only a minute weight of the material 

 without damage to the specimen. — Sabni Stefsnescu : 

 The activity and correlation of the molars and 

 maxillaries of miistodons and elephants. — Ren6 

 Sou^ges : The cmbryogeny of the Plantagacea;. The 

 development of the embryo in Flanlago lanceolata. — 

 J. Dauvergne and Mile. L. Weil: A method of pro- 

 pag.iting by cuttings in a sterile liquid medium. — J. 

 Beauverie : The yellow rust of wheat (Puccinta 

 ghimarum) in 1923. — Henri Coupin : The swelling of 

 seeds and the osmotic pressure of the medium. From 

 expenments on the swelling of seeds in sugar solutions 

 of varying concentration it is shown that the osmotic 

 pressure of the cells of seeds is generally high, from 

 20 to 45 atmospheres. — H. Colin and H. Belval : The 

 levulosanes in cereals. — Ph. Joyet-Lavergne : The 

 cytoplasmic structure of Adelina dimidiata, a parasite 

 of Scohpendra cingulata. — Pierre Danglard : The 

 vital coloration of the vacuolar apparatus in the 

 marine peridians. — Jules Amar : Transformism and 

 heredity. — L. Page and R. Legendre : The lunar 

 rhythms of some ncreidians. — C. Levaditi, S. Wicolau 

 and Mile. R. Schoen : Etiology of encephalitis. 



Official Publications Received. 



R«*cor<)8 ofllip Botanicnl Survey of Iniiia. Vol. 8, No. 4 : Flora Arabica. 

 ny Prof. Kthellwrl Blattwr. Part 4 : l-abiateap-Ceratophyllaceae. Pp. 

 8«.'>-450. (Calcutta : Oov.Tiinwnt Printing Office.) 1.6 rupee*. 



HofKirl of tho HoUnicnl Survey of India for l'.i2'J-23. Pp. 10. (Calcutta : 

 Ooveriinwnl Priiitinn Olllcf.) 



A Keix)rt o( th« Fifth ConKross of the Far Eastern Asuociation of 

 Tn.pica! Mwiicine held in .Malaya, September 3-17, 1!».'.S. Edited by Dr. 

 J. W. Schartl'. Pp. 90. (SingajMjre : Government Printing Office.) 



St«t«nientj< laid l»'for« the Committee on iieri-Heri (Sintrol and the 

 Ueiolntioii recommended tiy the Committee as amended by the Council 

 and i>as»ed at the General Meelinj; of the Fifth Congress of the Far 

 En.sterii Association of Tropical Medicine. Pp.12. (Singapore: Govern- 

 ment PrintiuK t)fflce.) 



Fon'st Uulletin No. 53 : Summary of Results of Treated and Untreated 

 KxiMMimental Sleepers laid in the various Railway Systems of India, 

 brought up to dat»'. By H. S. Pearson. Pp. 28. (Delhi : Government 

 C'-ntral Pn>8s.) 6 aniia.>i. 



University of Ciilifornin Bulletin. Third Series, Vol. 16, No. 11 : 

 University of Califomi,-* Publications, Price List 1923. Pp. 89. (Berkeley, 

 Cal. : University of California Press.) 



ProceedioRs of the Cambridge Philosophical Society. Vol. 21, Part 6. 

 Pp. 5m»-S12-(-viil. (Cambri.lge : At the University Press.) 10*. M. net. 



IJviiiKstone Collfjte. Annual Keport and Statement of Accounts for 

 the Year 1922-23. Pp. 24. (Leyton, E.IO.) 



The Maiiehester Steam Users' As.socialion for the Prevention of Steam 

 Boiler Explosions, and for tli"- .\ttaiiiinent of Economy in the Application 

 of Steam. Memoran-iiiiu by ( liicf Knjjiu.'.r for the Year llt22. Pp. 2a 

 (.Manchester.) 



Diary of Societies. 



MONDA Y, Dbcembbr 10. 

 Victoria ImmruTE, at 4.30.— W. Dale : Egypt in the Days of Akhenaten 



and Tutankhamen. 

 RoTAL Ofoorapiiical SociitTV (at Lowther TiOdge, Kensington Gore), at 



5. — Dr. A. T. Doodson : Tlie Work of the Liverpool Tidal Institute. 

 British Psvchoi.o<iical Society (Education Section) (Annual General 



Meeting) (at London Day Training College), at 5.30.— Prof. Wynn- 



.lones : Vocational Tests in Music. 

 Society or Enoineers, Inc., at 6 —Annual General Meeting. 

 Hotal Socirrv or Arts, at 8.— Prof. A. F. Barker : Recent Progress in 



the Wool Industries (Cantor Lectures) (2). 



TUESDAY, December 11. 



Ikstitittion of Petrolrom Technologists (at Royal Society of Arts), 

 at 8..S0.— L. R. McCollum : The Modern Rotary DrillinK System. 



Institute or Trassih>kt (MetropoliUn Graduate and Student Society) 

 (at Institution of Electrical Engineers), at t>.— C. Anderson : Ministry 

 of Transport Requirements, with reference to Railway Companies. 



Institite or Marine Knoinf.krs, Inc., at 6.80.— Adjourned Discussion 

 on Paper read by E. W. Blocksidge at the Shipping and Engineering 

 Exhibition on Life Saving Appliances on Large Passenger Steamers. 



RoTAL Photooraphic Socibtt (Scientific and Technical Group), at7.— 

 W. Clark : The Sensitivity of the Silver Halide Grains of a Photo- 

 graphic Emulsion. — Communication* from the Eastman Kodak 

 R«search liaboratory.— L. A. .Tones and E. Huse : The Relation 

 between Time and Intensity in Photoeraphic Exposure.— J. B. CUpstaflT 

 and N. B. Green : A Motion Picture O-ns-tonjfter. 



NO. 2823. VOL. 112] 



QvBKKrr MirHoNourioaL Ou7B, ftt 7.S0i— J. I. Bftrntrd : Soom Prob:' 



In MMtrn) MlrroMOpX. 

 I1.U V " 'iKCBBiiio S ' rtdfal aoaMgr or A«t*9k St - 



0.1 \. iTM.Bod' Kittommatmt Jk§§Vtm t. 



nil. ' Mi^iBMriiw ill i 



RoTAi. AMimMi-MumiOALlinrTiTi tk, ai 1. 1».— O. Hcvatt: ThtDoau' 

 Biltlali North BorMa 



WKDSKSDA r. DBt^num IS. 



NirriTOTtoK or Civil. RxoiirxBM (iDfomiAl MMtiag^ st 7.— W. I' > 



PaoRbBcntl, W. N. Booth, and others : DiaeoaaioBOB Tha Liglitli'. 



Factories. 

 It<ivAi. Socirrr or Amtb, at 8.— Mr Frank Balnaa: Tba P raaanratt''^ 



Hlntoric Bulldlnga and Andaat MoniuiMnta. 

 RfjYAL HoctBTY ow Mbdicivb (Pwychtatry Baction), at t.aOi'—Dr. W I. 



Templeton and Dr. H. J. Macbrldn : Tbf Malaria Trsatioaat of O. P 1 



THURSDAY, Dbcbmmr IS. 

 LoMDOv MAT»irM»Ttf At. ^rtrirrr (at Rrrm) Aiitr»w>m<r«1 JVjrfefr), b» ' 



H. n. C. li.. ■ T T ■ T- T' ■■■ 



•entatioii 



Kiilioia : - • 



.Marr : 111'- < )iriiti.iic.' nf a l.iii-:ii I».t<Tinitiantal Synfm of Point» - 



Major P. A. MacMahon : Propertlea of Prime NomMn dadoead tmm 



the CalculuK of Symmetric Functions. 

 Cini.D-.Sri i>v SociBTY (at Royal SaniUry In»tltot«), at 6.— Mlaa Kate 



Stevens : My Trip round the World. 

 Institi'tion or Ki,K<TKf M- Ks.. INKERS at «.— D. Brownlle: Piilrarl»#d 



Fuel and Elllcient St> I ,u. 



Society of Dvr.its and < London 8«M;tioo)(at the Dyam' Hall; 



Dowgate Hill), at 7. Klhea<l : Colour OolvenU and Uieir 



Application to Textib; Fibrca. 

 Optical Society (at Imperial CoUago of Scianea and TechnoloRy). at 7.sa 



— T. Smith : The Prioiarr and Secondarr Constant Magnin< ation 



Surfaces of Thin Lenses.— W. Swaine : A 8agge«t«d Stai 



Case and Simplittcation in Ophthalmic Policy.- B. K. Jo). 



hibitton of an Optical Revolution Counter. -D. Baxandall : > 



of the Troughton Dividing Engine (from tha Scienca MuAcum. 



Kensington). 

 C.B.C. SfiiETY KOR Constructive Bibth 0)irrBOL axd Raoal Pbo- 



oBF,ss (at Essex Hall), at 8.— Prof. E. W. MacBride: The Inheritance 



of Mental Defects. 

 Institute of Metai.s (Ixindon Ijoc»\ Section) and Institctioh or British 



FouNDRVMEN (at Institute of Marine Engineers, Inc.), at 8.— A. H. 



Mundav : Some Foumlry Problems. 

 Royal Society or Tropical Medicine and Hygiinb (Laboratory Meeting) 



(at London School of Tropical Me<iiclne, Endsleigh OardenaX at 8. r 



FRIDAY, De( EMBER 14. 



Royal Astronomical Society, at 5.— Dr. J. H. Jeans: Internal Motion* 

 in Spiral Nebulie.-J. W. GifTonl : Teleacopic Triple Object Olaaa of 

 High Relative Aperture. —J. a Plaskett : The H and K Line* of 

 Calcium in O-type Stars —J. H. Reynolds : The Galactic Distribution 

 of the Small Spiral ami Spheroidal Nebulte. 



Institution or Me( hanical Engineers, at 6.— Pro'. A. H. Gibson and 

 H. W. Baker : Exh.iust-Valve and Cylinder-Head Temperature* In High- 

 sj)ee*l Petrol Engines. 



Malacolooical Society or London (at Linnean Society), at «. 



Junior Institution or Enoinf.ers, at 7.30. — S. Bylander rJL.C.C. Regula- 

 tions for Steel Framed Buildings. 



SATURDAY, December 15. 



British Psycholooical Socikty (Annual General Meeting) (at 

 College), at 3.1.1.— Miss H. M. Wells: A Note on tlie P- 

 Sigiiitlcanceof the Psycho-galvanic Reaction.— J. Kay: Vi.*u.il ! 

 Tests. 



PUBLIC LECTURES. 



SATURDAY, December S. 



Horniman Museum (For«8t Hill), at S.SO.-Dr. B. M. Del- 



and Life. 



MONDAY, Dbckmbkr 10. 

 University Ck)LLBOE, at 5.30.— Prof. J. N. Bronsted : >om<- 1 ii.ii.t.-r> in 



the Recent Development of the Theory of Electrolytic Dissociation. 



(Succeeding Lectures on December 12 and 14.) 



TUESDAY, December 11. 



Royal Colleoe or Surc.eons or England, at 4.— F. W. I 



Intluence of Environment on the Life of Bactaria. (bucct^i i.^ 



Lecture* on Deceml)er 18, 17, 18, and 19.) 

 Royal iNSTrrcTE or Public Health, at 5. — Prof. D. LeTa.iiti : 



Harben Lectures. (Succeeding Lecture* on December 12 and 13.)' 

 KiNos College, at 5.80.— Miss Hilda D. Oakeley: The Root« of Early 



Greek Philosophy: Ethical. 



WBDSSSDAT, Dbcbmbek 12. 

 Rotal Institute or Piblic Health, at 4.— H. D. Herring: The iu.'^p. sai 



of the l)ead, with Special Reference to Cremation. 

 WFj!TriEi.» CoLLEf;K (IlautpsteadX at 5.15.— Prof. Craigie: The Making 

 of a Dictionary. 



THURSDAY, Dbcbmbbb IS. 

 Kino's Colleob, at 0.30.— Prof. Seton Watson : Tlie Balkan Slate> and 



Europe (League of Nations Union I^ecture). 

 UNIVF.R.SITT Colleob, at 5.30.— Miss M. A. Murray : Matrillneal Descent. 



SATURDAY, December 15. 

 Horniman Museum (For«8t Hill), at 3.80.— Miss M. A. Murray : My 

 Excavations in Malta. 



