November 17, 192 1] 



NATURE 



39» 



five Italian stations of Rocca di Papa, Moncalieri, 

 Padua, Montecassino, and Valle di Pompei for each 

 month of 19 16. — Dr. J. C. Cortini : Tylotnyces 

 gummiparus, n. sp., the prototype of a new genus 

 of hyphomycetes, i. This fungus was found on some 

 specimens of carnation that were attacked by 

 Fusarium, and the author refers it to the family 

 Dematiaceae, section Phragmosporae. The paper is 

 I illustrated by figures. — C. Artom : Cytological data on 

 : the tetraploidism of Artemia salina from the district 

 of Margherita di Savoia, in Apulia. A development 

 arising from a previous investigation, in which the 

 author found that the Artemias from eighteen different 

 localities were separable into two distinct groups, 

 differing in the size of the nuclei of their intestinal 

 cells. 



Books Received. 



Fundamental Catalogue of 1846 Stars for the 

 Equinox 1900, from Observations made at the Royal 

 Observatory, Cape of Good Hope, during the years 

 1912-1916, under the Direction of S. S. Hough. Pp. 

 xxx+38. (London : H.M. Stationerv Office.) los. 

 net. 



More Hunting Wasps. By J. H. Fabre. Trans- 

 lated by A. T. de Mattos. Pp. viii + 376. (London : 

 Hodder and Stoughton, Ltd.) 85. 6d. net. 



The Wonder Book of Science. Bv J. H. Fabre. 

 Pp. 287. (London : Hodder and Stoughton, Ltd.) 

 Ss. 6d. net. 



Fluoreszenz und Phosphoreszenz im Lichte der 

 Neureren Atomtheorie. By P. Pringsheim. Pp. viii 

 M-202. (Berlin : J. Springer.) In Germanv, 4S 

 marks; in England, 144 marks. 



Modern Electrical Theor>-. By Dr. N. R. Camp- 

 bell. (Cambridge Physical Series.) Supplementary 

 Chapters. Chapter xv : Series Spectra. Pp. viii-H 

 no. (Cambridge: At the University Press.) 105. 6d. 

 net. • 



An Introduction to Psychology. Bv S. S. Brierlev. 

 Pp. viii+152. (London :' Methuen and Co., Ltd.) 55. 

 net. 



Exploration of Air : Out of the World North of 

 Nigeria. By .A. Buchanan. Pp. xxiy + 258. (London : 

 J. Murray.) i6s. net. 



The Practical Chemistry of Coal and its Products. 

 By A. E. Findlay and R. Wigginton. Pp. 144. 

 (London : Benn Bros., Ltd.) 12s. 6d. 



Modern Gasworks Practice. By A. Meade. Second 

 edition, entirely re-written and greatly enlarged. 

 Pp. xii + 815. (London: Benn Bros., Ltd.") 555. 



Verhandelingen van Dr. P. Zeeman over Magneto- 

 Optische Vershijnselen. Pp. xyi + -i4i + i4 plates. 

 (Leiden: E. Ijdo.) ot t 1- 



Annales de I'Obserxatoire Meteorologique Physique 

 et Glaciaire du ,Mont Blanc. Publiees sous la direc- 

 tion de J. Vallot. Tome vii. Pp. vi-l-240. (Paris : 

 G. Steinheil.) 



Diary of Societies. 



THURSDAT, Notembee 17. 

 fe^nS"*^''"'"''"*'' ^'^'"^' ^* 10-€.-International Potato Con- 



^T''«^u***'""v."* 4.30.-Major P. A. MacMahon and W. P. D. 

 ^a^-Mahon: The Design of Repeating- Patterns.— Prof. J. W 

 Nicholson : .4. Problem in the Theory of Heat Conduction.— Prof. 

 Liw '-n /^ ^^ Thermal Stresses in Spherical Shells Concentric- 

 ally He.ated.-R A Fisher : The Mathematical Fonndations of 

 Theoretical Statistics.-F. P. White: The Diffraction of Plan<' 

 Kle^romag-netic Waves by a Perfectly Reflecting Sphere.— Prof. 

 Phenome*'"^'^ ""^ ^" ^' S^^^^'l^nd • The Whispering Gallery 



^^iT^'^*^^'!"' ?•■ I^O'-'DO^- at 5.— Capt. A. W. Hill : Account of an 

 Kspedition to the Cameroons and Nigeria in 1921. 



lx)KiK)if Mathematical Society (at Roval Astronomical Society), at 

 o (Annual General Meeting).— S. Banach : An Example bf an 



NO. 2716. VOL. 108] 



Orthogonal Development whose Sum is Everywhere Different from 

 the Developed Function. — A. C. Dixon: Expressions and Func- 

 tions Reduced to Zero by the Operator sinh D-cD. — H. Hilton : 

 Plane Curves of Degree 2n with Tangents having bi-n-point 

 Contact— C. Krishnamachary and M. Bhimasena Rao : A Table 

 of Values of 30 Eulerian Numbers, based on a new method. — L. J. 

 Mordell : The Number of Solutions in Positive Integers of 

 the Equation yz+zx+xy = n. — 6. P61ya : Sur ies series entiferes 

 k coefficients entieres. — H. J. Priestley : Some Applications of 

 Integral Equations to the Theory of Differential Equations. — 

 — W. F. Sheppard : Inverse Correspondence of Differences and 

 Sums. — T. Stuart : The Parametric Solutions and Minimum 

 Numerical Solutions of i'-f}--(- ■i=u*+v* — ^R. Vythynatha- 

 swamy : Generating Regions of a Quadric in Space of n Dimen- 

 sions. — B. M. Wilson : Proofs of some Formulae enunciated by 

 Ramanujan. 



RoiAL SociETT or Medicixe (Dermatology Section), at 5. 



RoTAL Aehonactical Societt (at Royal Society of Arts), at 5.30. — 

 Col. F. Searle : Requirements and DiflSculties of Air Transport. 



IssTiTmoN- OF MixixG A\D METAiirBGT (at Geological Society t. 

 at 5.30.— H. F. Collins : The Igneous Rocks of the Province of 

 Huelva and the (Senesis of the Pyritic Orebodies. 



iNSTiirTiox OF ElECTRTCAL ExGiNEEBS, at 6. — E. S. Byng : Telephone 

 Line Work in the United States. 



Chemical Society, at S.— H. Burton and J. Kenner : The Influence 

 of Nitro-groups on the Reactivity of Snbstituents in the Benisine 

 Nucleus. Part. T., Heteronucleal Dinitro-derivatives. — F. Chal- 

 lenger and J. F. Wilkinson : Organo-deriyatives of Bismuth. 

 Part v.. The lability of Halogen. Cyano-, and Thiocyano- 

 derivatives of Tertiary Aromatic Bismuthines. — F. Challeneer and 

 L. R. Ridgway : Organo-derivatives of Bismuth. Part TI.. Thp 

 Preparation and Properties of Tertiary .\romatic Bismuthines 

 and their Interaction with Organic and Inorganic Halogen Conn- 

 pounds.^^. Silberrad : Researches on Sulphury 1 Chloride. Part I., 

 Influence of Catalysts : A Convenient Method of Chlorinating 

 Beniine. 



RoYAt Society op Teopicai Medicixe axd Hygiexe (at London 

 School of Tropical Medicine), at 8.15.— Laboratory Meeting. 



FRIDAr, NOVEMBEB 18. 



Royal HoETicrLTCKAL Society, at 10.30 — 1.30. — International Potato 

 Conference. 



Association or Ecoxomc Biologists (in Botanical Lecture Theatre, 

 Imperial College of Science and Technology), at 3. — Dr. E. J. 

 Butler and others : Discussion : Meteorological Conditions and 

 Disease. 



IxsTiTCTE OF Tr.axsport (Graduates' and Students' Section^ (at 

 Royal Society of Arts), at 5. — J. P. Thomas : The Operation 

 and Development of Urban Electric Railway Services. 



Royal Society of Medicixe (Otology Section), at 5. 



IxsTiTVTio.v of MECH.AXICAL ExoiXEEBS, at 6. — Dr. E. H. Salmon : 

 The Machinery of Floating Docks. 



JixiOB IxsTiTCTiox OF ExGiXEEBS, at 7 (Annual General Meetingl. 



Royal Photogbaphic Society of Gbeat Bbitaix, at 8. — J. D. John- 

 ston : Photography in Relation to the Graphic Arts. 



Royal Society of Medicixe (Electro- therapeutics Section), at 8.30. — 

 Dr. F. Daels : (1) Histological Pictures of the Curing of Uterine 

 Baso-cellular Epithelioma. (2) The Use of Drainage Tubes in 

 the Irradiation of the Pelvis with Radium. — Dr. G. Fildes : 

 Further Remarks on the Potter-Bucky Diaphragm. 



SATURDAY, November 19. 



British Mycological Society (in Botany Lecture Theatre, Univer- 

 sity College), at 11.— Dr. G. R. Bisby : The Use of Fungicides 

 on Potatoes in North America. — Dr. W. Brown : The Growth of 

 Fungi in Cultures. — W. N. Edwards : An Eocene Microthyriaceous 

 Fungus from Mull, Scotland. — Dame H. C. I. Gwynne-Taughan : 

 The Grouping of the Simpler Ascomycetes. — Dr. A. S. Home : 

 Fungi from a Diseased Hevea Stem. 



Physiological Society (at St. Thomas's Hospital), at 4. — J. N. 

 Langley : Sweat Secretion. — W. E. L. Brown : An Independent 

 Determination of the Value of " n " in Hill's Equation. — T. 

 Lewis, C. C. Iliescu, and A. M. Wedd : A Paradoxical Effect 

 of Vagal Stimulation upon the Auricles. — D. Noel Paton : The 

 Significance of Digestion Leucocytosis. — F. R. Fraser : The 

 Reaction of Human Blood in Cardiac and Renal Disorders by 

 the Colorimetric Method.— A. V. Hill : The Maximum Work of 

 Human Muscles.— A. V. Hill and J. C. Bramwell : The Velocity 

 of the Pulse Wave. — Miss D. V. .Atkinson : The Osmotic Pressure 

 of Haemoglobin in Blood. — E. C. Dodds and T. I. Bennett : 

 Some New Observations on Diabetes Mellitus. — J. H. Burn : The 

 Relation of Nerve Supply to Sweating produced by Pilocarpine. 

 — J. Mcllanby : Experimental Dyspnoea. 



JlOyDAT, November 21. 

 Ixstitttiox of Electrical Exgixeebs (Informal Meeting), at 7. — 



A. J. Hainsworth and others : Hydro-electric Power. 

 IxsTiTrTiox OF Mechaxical Exgixeebs (Graduates' Meeting), at 7. — 



J. Harrison : Some Thoughts on Motor-cycle Engine Design. 

 Abistoteliax Society (at University of London Club), at 8. — Dr. 



F. W. Thomas : Xn Indian Doctrine of Perception and Error. 

 Royal Ixstitute of British Architects, at 8. — G. H. Widdows : 



School Design. 

 RoT.AL Geographical Society (at ^olian Hall), at 8.30. — J. il. 



Wordier Jan Mayen : An Old Arctic Volcano. 



TUESDAY. November 22. 



Royal Society of Medicine (Medicine Section) (at St. Thomas's 

 Hospital), at 4.45. 



Zoological Society, at 5.30.— Dr. A. Smith Woodward : Exhibition 

 of a Fossil Human Skull from Broken Hill. North Rhodesia. — 

 Dr. C. F. Sonntag : Contributions to the Visceral Anatomy and 

 Myology of the Marsupialia. — C. W. Hobley : The Fauna of 

 East Africa and its Future.— H. Matsumoto : Megalohyrax 



