December 9, 1920] 



NATURE 



491 



A. Angeli and C. Lutri : Black compounds of pirrol, 

 viii. — II. S. Washington: Italite, a new leucitic rock. 

 This was discovered by Baron G. \. Blanc and F. 

 Jourdain on the western flank of the volcano of Rocca 



Monfina in a lava-current more than loo metres in 

 length. — G. AndreoU : Some functional inequalities 

 leading to developments in series. — T. Bogglo : Lines 

 of force in a stratified spheroid. — C. .Mineo : Trans- 

 ference of co-ordinates along a geodetic. The formulae 

 established by the author are applied to a numerical 

 example in geodesy previously calculated by Pizzetti, 

 and are found to agree with his results. — M. Pascal : 

 Resultant pressure on a wing of an aeroplane. This 

 is a solution of a hydrodynamioal problem in two- 

 dimensional stream-line motion by means of a con- 

 formal transformation. — G. Allverti : State of con- 

 traction of electrolytic metal deposits, i. Stoney's 

 method is applied to test whether the contraction is 

 or is not due to thermic effects.^E. Oddoae : Deter- 

 mination of the seismic hypocentre. An empirical 

 formula is established connecting the depth of the 

 hypocentre with the period of the waves of maximum 

 length. As applied to recent earthquakes, this 

 formula gives values for the hypocentric depth of 

 from q to i.^ km., agreeing fairly well with the known 

 results obtained by more exact methods. — E. Clerici : 

 Pelagosite from Canalgrandc (Iglesias). This mineral, 

 which was discovered in the form of encrustations on 

 a cavern excavated by the waves, was found to agree 

 in its properties with specimens obtained from Argen- 

 tario. — L. Pieragooll : Patholc^y of Vruts spelaeus 

 from the caves of Egui. These remains, which were 

 fxcavatcd by Prof. Carlo de Stefani, were found to 

 1)0 greatly affected by tuberculosis, showing these 



niimals to be liable to the same diseases as man, and 

 I his to an extent which may have been instrumental 

 !n causing the extinction of the species. — C. Artom : 

 Biology of the genus .Artcmia. — L. Petri : Cause of 



irrested development of the ovary in the olive. Ac- 

 < ording to Dr. Pirotta, olive-trees could be classified 

 into four distinct tvpes, characterised by the presence 

 or absence of sterile or fertile flowers, flowers with 

 imperfectiv developed ovaries, or mixtures of these 

 forms. The author disagrees with Dr. Pirotta's theory, 

 md maintains that the arrested development of the 



vary is a phenomenon common to all varieties of wild 

 .ind cultivated olives, which may be brought about by 

 '•xtraneous temporarv causes of recent date. The 

 ( rmditions favourable to the production of lh« different 

 forms of (lowers remain lo be determined. — A com- 

 mittee, consislinp of L. Luzzatti, G. de Marchi, and 

 R. Pirotta (recorder), presented a report on Dr. Giro- 

 lamo .Azzi's orooosals for dealing with mi-ieorologicnl 

 and geographical problems relating to ai^iii ulturc 



Books Received. 



The Principles of Economic Geography. Bv Dr. 

 K. N. Rudmose Brown. Pp. xv+ztiS. (London : Sir 

 Isaac Pitman and Sons, I. id.) lov. ful. net. 



Infant Kduralion. By Dr. K. Prilchnrd. Second 

 idition. Pp. xv+226. (London: II, Kiiiipton.) 6s. 



net. 



Phvsiolot'v and Biocheniislrv in Mixlern Medicine. 

 Uy ProL J. J. R. \r.ul,,.,l Third edition. Pp. 

 xxxii +993 +9 plates i Kli)|,i n ) 42$. 



net. 



The Yeasts. Bv Prof. .\. (iHilllerniond. Trans- 

 : lated bv Dr. F. W. Tanner. Pn xir f 424. (New 

 York: }. Wilev and Sons, Ir Chapman 



and Hall, Ltd.) .^i*. net. 



H.Tndbuch der Regionalen tnoloiiio. Edited by 

 Prof, G. Steinmann and Prof. O. Wilrkrns. 20 Heft, 

 1 1 1 Band, 1 Ahteilung. : The British Isles. By 



NO. 2667, VOL. 106] 



P. G. H. Boswell and others. Local Editor, J. W. 

 Evans. With an Appendix, The Channel Islands, by 

 J. Parkinson. I^p. 354-|-plaU"-. (Heidelberg: Carl 

 Winter.) 



Nucleic Acids. By Prof. W. Jones. Second edition. 

 Pp. viii+150. (London: Longmans, Green and Co.) 

 9s. net'. 



Bolshevik Russia. By G. E. Raine, in collaboration 

 with Dr., E. Lubolf. I'p. ni2. (l.ninlon: Nisbet and 

 Co., Ltd.) IS. net. 



London Trees. By .\. D. \\ cbsicr. Pp. xii + 218-t- 

 32 plates. (London : Swarthmore Press.) i^i. net. 



Medical Research Council and Department of 

 Scientific and Industrial Research. Reports of the 

 Industrial Fatigoe Research Board. No. 10 : Pre- 

 liminary Notes on the Boot and Shoe Industry. Pp. 

 32-fvii plates. (London : H.M. Stationery Office.) 

 IS. 6d. net. 



A Last Diary. By W . N. P. Barbellion. Pp. 

 xlviii-f 148. (London: Chatto and Windus.) 6s. net. 



.\ncient Egypt. Part 4, 1920. (London : Macmillan 

 and Co., Ltd.) 2s. net. 



Prevention of Venereal Disease. By Sir G. Arch- 

 dall Reid. Pp. xviii-(-447. (London : \V. Heinemann, 

 Ltd.) 15s. net. 



Science German Course. By G. W. P. Moffatt. 

 Third edition. Pp. xii-)-27o. (London : W. B. Clive.) 



Practical Biological Chemistry. By Prof. G. 

 Bertrand and P. Thomas. Translated from the third 

 edition by H. A. CoIwcU. Pp. xxxii-t-348. (London : 

 G. Bell and Sons, Ltd.) io.v. 6d. net. 



Highways and Byways in Northumbria. By P. .\. 

 Graham. Pp. xviii-i-380. (London : Macmillan and 

 Co.. Ltd.) 7s. 6(i. net. 



The I^eague of Nations Starts. An Outline bv its 

 Organisers. Pp. xi-f-282. (London : Macmillan and 

 Co., Ltd.) lox. Cxi. net. 



Diary of Societies. 



THVRSD.ir. DFCEjiBtn 9. 



BOTAL ■Bocimr. kt 4.30.— Lord ItHyloiifh : Duublo Refraction r.tid 

 Oryitslline Structure of Silica (Hus.^.— Prof. J. W. Nioholioo ind 

 Prof. T. R. Merton ; Tho Effect of .Vnymmetry on .'^kve-leiiifth 

 Determination*.— Prof. T. B. Mcrtiin : The Effect of CoDcentm- 

 tion on tho Spectra of Luminous Oasee.- I'rof. E. Wilton : Tho 

 Meaanrement of Low Magnetic 8u8ccptil)itity hj an Instrument 

 of New T^pe.— Prof. W. T. David ; The Internal Energy of In- 

 flammable MIxtnrea of CoalKas and Air after Eiplotion.— Prof. 

 A. MoAulay : Mnltenionii and Differential Inrariant*. 



LiRxuzt SociiTT, at 5.— Prof. R. Nowitead : Uganda Bioloffjr (Lan- 

 tern Lecture). 



I.0!<D07< MirnmiATiCAi. SocuTi (at Ro.val Antronomical Soeiet.v), at 

 S.— 8. Beatty: The Alirebraic Theory of Algehraie Funetioni of 

 One Variable.— F. Uebano : The Con»lruction of Magio Square!.— 

 Prof. A. 8. Kddinirton : An Apniication of the Caleului of 

 Teniora to the Theory of Finite Differences.— Prof. A. R. Forsyth : 

 Developable Surfaces Ihrongh a couple of Oulding Curves in 

 Different Planes,— J. E, Jones : The Dlstrilmtion of Knerifv in 

 tho Neighbourhood of a Vibratlnir Sphere.-L. J. Mordell : 

 (1) The HeoiprooitT Formula for the Oanss's Sums in a Quad- 

 ratic Field. («> A Sew fM«»« of Definite Infej-rals.- Prof. O. N. 

 Watson ■ The Product of Two Ilyiicrircnmefric Functions— Prof. 

 W. It. Tounjt: (1) Inteirration over the Area of a Surface and 

 Transformation of the Varinlilcs in « Multiple Inteiirral. (2> A 

 New Set of Conditions f..r n Formula for an Area 



Rorti Socrrrr or M«n>cti«« (Balneology and CIii> * ' "' ' '' 



at SI.', —Dr. Ma« Pors-es ■ Mud Baths and ' 

 Hernaman-Johnson : The Importance of Couii 

 DIaMosis and 1 I'r. S. Bnrrld^e : snme i-o.«iihc 



III effects of Bar , _, .. 



l!t«TiTrTto«c or Ft -..ifirsaa (at Tnstltntinn of rt»(f 



I at «, All, •nm.il Discussion "' "'' Tl 



und B Kain on The t)i 

 rconomie Asitects of K.H.T. 

 lea. 

 It r or Mrninis (Veuroloev fleetlonl. at •.».— Dr. P. 



I! iihes. it* Karlr Reemrniflon and Treatment. 



rnrnAr. D«ctii»«« i«. 



Ainnfuti'V .It voxoMir Tlir>i.notsn (ia the Bntanieftl Theatr*. 



1 at J.30.— Eihibitlon of SpeelmeDS 



W. J. Dnwson ■ Problems of 



) !■ F.ast Affiea.— Dr. M. C. Raynrr : 



HiUageu Fixation in titc Krie 



