144 



NA TURE 



[June 7, 1894 



March shows a <If cicIe-1 minimum of spot snrface more marked 

 than ihe minimum of November 1S93 : the maximum for spots 

 was in August 1S93, ^""1 forfacula: in May of the same year. — 

 On four related solutions of the problem of the transformation 

 relative to the elliptic function of the second order, by M. F. de 

 Salvert. — On the limitation of degree for the algebraical 

 integrals of the differential equation of the first order, by M. 

 Autonne. — On Ihe properties of groups of substitutions of which 

 the order is equal to a given number, by M. E. Maillet. — On the 

 integration of partial equations of the second order with two 

 independent variables, by NJ. J. Beudon. — On uniform integrals 

 of partial differential equations of the first order and^<rH;(fr<r.>, by 

 M. Petrovitch. — Variation of the surface tension with the 

 temperature, by M. H. Pellatt. A niathema'ical paper leading 

 to the conclusion that the surface tension is a bnear (unction of the 

 absolute temperature. — On the capacity of the capillary electro- 

 meter, and or. the initial capacity of mercury, by .\1. E. Bouty. — 

 Method for the direct measurement of eleciromotive forces in 

 absolute value, by M. C. Limb. The method depends on the 

 direct comparison of the unknown electromotive force with an 

 induced electromotive force in a case where the latter may be 

 calculated. — Riitimi of meteorological observations made at 

 Joal (Senegal) by the m ssion sent by the Bureau des Longitudes 

 to observe the total eclipse of the sun on April 16, 1S93. A 

 note by M. G. Bigourdan. — On the detection of hydrochloric 

 acid, by M^L A. Villiers and M. Fayolle. — .V comparative 

 study of the nilrobenzoic acids, by M. Oecbsner de Coninck. 

 The reactions of these acids with aqua regia, dilute chromic 

 acid, dilute hydrochloric acid, dilute nitric acid, dilute alcohol, 

 and acetone have been further studied. Just as was found for 

 their physical properties, two of these acids yield similar reactions, 

 and differ from the third. — On the constitution of licareol, by 

 M.^L Ph. Barbier and L. Bouveault. The formula adopted 

 now for licareol is the following : — 



CH3. C{CH,) : CH . CH„. CH(CH„OH).C (CH3) : CH„. 



Athough licareol has given nearly the same products of oxida- 

 tion as geianiol, the corresponding aldehydes appear to be 

 different, as they give compounds with para-amidopbenol having 

 different melting points. Licareol is active, geraniol is inactive, 

 and may possibly be a racemic form of ihe alcohol. — On the 

 melting points of some phenols and their benzoates, by MM. A. 

 Bebal and E. Choay. A tabular statement. — On the rectification 

 of alcohol, by M. E. Sorel — On the latex of the lacquer-tree, by 

 M. G. Bertrand. Themechani^moftheproductionof lacquer from 

 the exudation from trees of the Klnn genus is demonstrated. It is 

 shown that the oxidation of the mbstance /«;•«/ only produces 

 the characteristic black insoluble lacquer in the presence of a 

 diastase termed by the author laccase, — On parthenogenesis in 

 the Sarcoptidx. A note by M. E. Trouessarl. — On the develop- 

 ment of excretory organs \n Amphiuma, by M. Herbert llavi- 

 land Field. — Utilisation of vintage marcs, by M. A Munlz. The 

 wine retained by the maic is displaceil mechanically by water in 

 special cylindrical vessels, and yields a good quality wine 

 practically undiluted. The residual marc after treatment is 

 utilised as cattle food. 



Amsterdam. 



Royal Academy of Sciences, April 21. — Prof, van de 

 Sande Bakhuyzcn in the chair. — Prof. Schoute made a com- 

 munication on the regular seclicni and projections of the heka- 

 IcmkosKdroid (Z'-'") and the hexakosiccdroid (Z*"'). The chief 

 reinlls can be gathered from the following table : — 



.2 I 



44 ll / 



120 !{ e 



78 V 



80 



120 € 



1 ' 



/•■■'"' 



The four columns ol the ahovc represent at the same lime the 

 num1>er of vertices, cdgt?> and faces of ihc i>rojcction5 of 't^^ 



and Z'-"', an*i the numher of faces, edges and vertices of ili 

 sections of Z*-"" and Z'^"'. — Prof. Kamerlingh Onnes communi- 

 cated (he results of measurements made by Dr. Zeeman in the ' 

 Leyden laboratory, of ihe refleclion of polarised light on the, 

 pole of a magnetised nickel mirror. The so-called null rotation j 

 changes its sign at the incidence of 26^ in accordance with 

 Goldhammer's theoij'. Drude's iheoiy gives a value of 6o^ 



BOOKS AND SERIALS RECEIVED. 



Books.— The Frog: Prof. A. Milncs Marshall, slh edition (M.inchester, 

 Cornish). — Walks in Belgium— the i,)ld Flemish To«ns and the Ardennes: 

 edited by P. Lindley (30 Fleet Street). — A Handbook to the Marsupialia 

 and Monotremata: R. Lydekker (\V. H. Allen).— A H.indbook to the Birds 

 of Great Britain: Dr. K. K. Sharpe. vol. i (W. H. Allen).— Flore de 

 France: A. Acloquc (Paris, Baillicre). — The C-imel, iti Uses and Manage* 

 inent; Major A. G Leonard (Longmans). — The Country M-^nth by Month : 

 J. .'V Owen and Prof. Roulger, June (Bliss). — Eiemeotidi Fiscia ; Prof. A. 

 Roiii, vil. 2(Firenze, Moonicr). — An Introduction 10 the Study of MetaU 

 lurgy : Prof. \V. C. Robcrts-.\usten, 3rd edition (Griffin). — Klectriciiti Ap* 

 pliquce a la Marine: P. Mine) (Pan.*, Gauihicr-Villars).— litudc Expiri- 

 mcntale Dynamujue d'une .Machine a Vapcur : \'. Dwelshauvers-Dery 

 (Paris, Gauthier-Vdiars). 



StiRiALS. — Kngtish Illustrated Maga^^tne, June (London).— Zeiischnft (nr 

 Physikalische Chemie, xiv. Band, 1 Heft (Leipzig, fclngelmann).— Brain, 

 Part 65 (Macmdlan) — Natural History of Plants: Kerner and Oliver, 

 t'art 2 (Blackic). — Natural Science, June (Macmillan). — Longman's ^L1ga- 

 zine, June (t-ongmans). — Chambers's Journal, June (Chambers). — Good 

 Words. June (Isbistcr). — Sundsy Magaxine. June (Isbister). — Beiir^ige /ur 

 Methodik der Erdkundc, Heft i (Halle a S.). — Humanitftrian, June 

 (Sonnenschein). - Century Magazine, June (Unwin), — Cassell's Mag.-i.in . 

 June (Cassell). — Report of the Marlborough College Natural Hi- 

 Society, No. 42 (Marlborough). —Tran>aciiuns of the Linnean Soci< ; 

 London, 2nd series, Zjology, Vol. vi. Part 2; The Subterranean Crusi.i 

 of New Zealand : X>t' C. Chilton (Taylor and Francis). — National Re\ ; 

 Jtme (.\llcn). — Contemporary Review, June (Isbister).— Etiropean Hm: 

 (lies and Moths : W. F. Kirby. Part i (Cassell) — Geographical Join; 

 June (Stanford). — Bulletin de rAcadcmie Royale des Sciences dc Bcl^;; 

 No. 4, tome 27 (Bnixeltes). — Journal of Botany, June(West). — FortUK 

 Review, June (Chapman). — Geological Magazine, June (K. Paul).— ! 

 cyklopscdie der Naturwissenschaftcn, Ersic Abihg., 68 Licfg. ; 7-\\- 

 .-Vbthg.. 77 to 8a Liefg. ; Diitie Abthg., 16 to 21 Liefg. (Breslau, Trewc; 

 — Science Progress, lunc (Scientific Press, Ltd.). — ^lichigan Stale A 

 cultural College, Experiment Siatioo, Bulletins 107-110 (Michig^in 

 Bulletin of the New York Mathematical Society, Vol. 3, No. S (New \ 

 Macmillan). 1 



CONTENTS. PAGE 



Hagen's Synopsis of Higher Mathematics. l!y Dr. 



J. W. L. Glaisher, F.K.S 121 



Micro-Chemistry I22 



Our Book Shelf:— 



K. O. Hower : " Practical Botany for Beginners " . . 123 

 J. .\. Hower: ".Simple Experiments for Science 



Teaching " • I : 



Letters to the Editor :— 



The Teeih .ind Civilisation. — J. Howard Mummery, 



M.R.C.S. ... 123 



Centipedes and their Young. — J. J. Quelch ... 124 

 The Penetrative Power of Bullets. — Kev. Frederick 



J. Smith 124 



TheGarhwal Landslip.— Lieut.-GeneralR.Strachey, 



F.R.S 124 



Research Work. — W. G. Woollcombe 124 



A Daylit;ht Meteor. — Jas. G. Richmond 124 



Iron Crows' Nesis. — J. McNaught Campbell . . . 125 

 The Report of the Committee on Army Examina- 

 tions 125 



Recent Additions to the Zoological Society's 



Menagerie. {JlliislrateJ.) 127 



Notes 129 



Our Astronomical Column :— 



Astronoiiiic.il Congresses at Llrechl and Vienna . . 13* 



Proposed Astronomical Congress in 1896 IJ3 



The Law and Greenwich Time 133 



The Work of Hertz. ( (F/M Diagram.) liy Prof. 



Oliver Lodge, F.R.S 133 



The Report of the Astronomer Royal 139 



Science in the Magazines 14° 



University and Educational Intelligence 141 



Scientific Serials 14' 



Societies and Academies 14' 



Books and Serials Received ... 144 



NO. I 284, VOL. 50] 



