January 20, 192 1 J 



NATURE 



683 



less devoid of contents, and in the different species 

 show decided variation in arrangement and number. 

 Their origin is evidently due to the separation of 

 certain cell-tissues and their later disintegration. — Dr. 

 G. Barker : The temperature of the vapour arising 

 from boiling saline solutions. It is shown that the 

 temperature of the vapour can be obtained well over 

 100 C. by boiling the solution in a hypsometer, either 

 by a Bunsen flame or by admission of steam from 

 water boiled in a separate vessel With a solution 

 of calcium chloride boiling normally at 115" C. a 

 mperature of 106° C. was obtained for the vapour 

 I a point 10 in. above the boiling solution. It is 

 1 laimed that under the conditions of the experiment 

 superheating could not take place. — J. H. Maiden : 

 Notes on two .Acacias, (i) The first is a spreading 

 :irub, which may, however, assume an erect habit 

 and become 10 ft. high. Its affinities are shown in 

 that it was formerly known as Acacia doratoxylon 

 var. angustifolia. It differs from that species in its 

 habit, in its smaller size, in the short sessile flower- 

 -pikes, which are axillary and not racemose, and in the 

 l)airy ovary. It is found cFiefly in the New England 

 ^jranite country from Howell, near Tingha, as far 

 north as Stanthorpc and the Toowoomba district in 

 Queensland. {2) The second wattle is submitted as a 

 form or race of Acacia pycnantha, Benth., or a new 

 species. In its ordinary morphological characters it 

 resembles closely the species named, but there are 

 important differences in the seedlings, the percentage 

 of tannin in the bark, and other characters which 

 lead the author to propose it as a new species. The 

 fvpe comes from Jerrabomberra, in the Federal Terri- 

 tory, near Queanbeyan. — E. Clieel : A native tea-tree, 

 Leptospermum flavescens var. grandifloritm. This 

 plant occurs in the deep creeks and river-beds from 

 Penrith, extending to the Blue Mountains on the 

 western line, and from Douglas Park to Braidwood 

 on the southern line and tablelands. It was suggested 

 that the plants were quite different from anv other 

 species, and the oil obtained from the leaves by Mr. 

 A. R. Penfold tends to confirm this view. 



Books Received. 



The Foundations of Chemical Theory. By Prof. 

 R. M. Caven. Pp. viii-^266. (London : Blackie and 

 Son, Ltd.) I2J. 6d. net. 



A Physician's .Anthology of English and American 

 Poetry. Selected artd arranged by Dr. C. A. Wood 

 and t)T. F. H. Garrison. Pp. xxiii+346. (London : 

 Oxford University Press.) Ss. 6d. net. 



Les Hommes Fossiles : Elements de Paltontologie 

 Humaine. Bv Prof..M. Boule. Pp. xi+491. (Paris: 

 Masson et Cie.) 40 francs. 



Penrose's Annual. Volume 23 of the Process Year 

 Book and Review of the Graphic .Arts. 192 1. Edited 

 bv W. Gamble. (London : P. Lund. Humphries and 

 Co., Ltd.; Bradford: The Country Pre.ss.) 101. 6d. 

 net. 



Personal Beauty and Racial Betterment. By Prof. 

 K. Dunlap. Pp. 05. (London • H. Kimpton.) 6s. 

 net. 



Practical Dental Metallurgy. By Prof. J. D. 

 Hodgen. Fifth edition, romplelely revised. Pp. 436. 

 (I^^ndon : H. Kimpton.) 15s. net. 



Lubricating and Allie<l Oils ; A Handbook for 

 Chemists, Engineers, and Students. By E. A. Evans. 

 (The Directlv-Usrful Terhninil .Series.) Pp. xv+ 

 mR. (T.ondnn : Chapman and Hall. Ltd.) 9.?. 6d. 



NO. 2673. VOL. IO6I 



Science Masters' Association : Oxford Meeting, 

 January 5-6, 192 1. Practical Suggestions towards 

 the Study of Crystals in Schools. By T. V. Barker. 

 (Oxford: The Holywell Press.) is. net. 



Palaontologie und -Abstammungslehre. By Prof. K. 

 Diener. Zweite auflage. Pp. 137. (Berlin and 

 Leipzig : W. de Gruyter and Co.) is. gd. 



The Theory of Direct-Current Dynamos and Motors. 

 By J. Case. Pp. xiii+196. (Cambridge: W. Hefler 

 and Sons, Ltd.) 15$. net. 



An Introduction to the Chemistry of Plant Pro- 

 ducts. By Dr. P. Haas and T. G. Hill. Vol. i. : On 

 the Nature and Significance of the Commoner 

 Organic Compiounds of Plants. Third edition. Pp. 

 xiii-i-414. (London : Longmans, Green and Co.) i6s. 

 net. 



A Text-Book of Physics. By Dr. W. Watson. 

 Seventh edition, revised by H. Moss. Pp. xxvi-f976. 

 (London : Longmans, Green and Co.) 21s. net. 



Department of .Applied Statistics (Computing Sec- 

 tion), University of London, University College. 

 Tracts for Computers. Edited by Karl Pearson. 

 No. ii. : On the Construction of Tables and on Inter- 

 polation. Part i. : Uni-variate Tables. By Karl 

 Pearson. Pp. 70. 3s. 9J. net. No. iii. : On the 

 Construction of Tables and on Interpolation. Part ii. : 

 Bi-variate Tables. By Karl Pearson. Pp. 54. 3J. gd. 

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General Practice and X-Rays : A Handbook for the 

 General Practitioner and Student. By .Alice V. Knox. 

 Pp. xiv-l-214-l-xxxii plates. (London: A. and C. 

 Black.) isi. net. 



The New Hazell Annual and .Almanack for the 

 Year 192 1. Thirty-sixth Year of Issue. Pp. lvi-1- 

 823. (London : H. Frowde and Hodder and Stough- 

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Clouds : A Descriptive Illustrated Guide-Book to 

 the Observation and Classification of Clouds. By 

 G. .A. Clarke. Pp. xvi+ 136-^40 plates. (London: 

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The Raw Materials of Perfumery : Tlieir Nature, 

 Occurrence, and Employment. By E. J. Perry. Pp. 

 ix+ii2. (London: Sir I. Pitman and Sons, Ltd.) 

 3*. net. 



Diary of Societies. 



THURSDAY. jAntmiT 20. 



RoiAL IN9TITCTIOK Of Obut BKiTiiH, kt 3.— Dr. A. Harden: 

 Biocbriniitr; (ViUminci). 



Roiii, 80CIITI, at 4.30.— Sir Robert Iladfleld, Bart., 8. R. Wll- 

 liama, and I. 8. Bowen : The Uagnrtie Mrohanieal Analyaia 

 of Manranen Steel.— Dr. W. S. Tucker and E. T. Parii : A 

 Beleetire Hot-wire Hiorophooo.— E. A. Milao and R. II. Fowler: 

 Siien Harmonica and a Pure Tone Siren.— Prof. L. V. ling : 

 The Draign of DIaphragma oapable of C'ontinuoua Tuning. 



LiN:<u>r SociRT, at &.— Prof. £. H. 0. Walah : Lhaaa and Central 



Rout AraoHAmCAL Socirrr (at Royal Society of Arta). at &.— 

 Lord Montairn of Bcaullcn : The Coat of Air Ton-milca oompared 

 with Other Korma of Tranaport. 



ROTiL SocitTT or iltDicixi (Dermatology Scotlon), at S. 



l!t»TiTiirioi« or MiNito axo Mrrti.Li'Bai (at Goolocical Society), 

 at 5.30.— R. E. Palmer: Some Obaerratinna on Mining by the 

 Openoaat or Stripping .Method.— K. A. Wraight : The RUndardlaa- 

 tion of Itateriala Kmplnved in Mining and Millinir Plant.- A. M. 

 Pontie : Notea on the TIlghleTol Diamond Depoaita of Braail. 



IirsTiTtrion or ArTOKoaiii KxoifriiTia (London Oraduatea" Meet- 

 ing), at 8.— W. H. Wardall: OTlinder and Piaton Wear. 



CamiCAL Socirrt, at R.— J, V. Baekea. R. W. Wcat. and M. A. 

 Whiteley : QiiantltatiTe Heduotion by Hydriodic Aeld of Halo- 

 grnated Malonrl Drrl»«ti»ea. Part I., The Amidea of Bym. 

 DiallcTl and ArVl Sii»i«titiited Amidea of Mono, and Dlbromomal- 

 onio Aold.— B. M. Onpta : An InTeatigatlon on the Influence of 

 NerallTe Oroiipa of Piffrrent rharaeter nn the ReaetiTlfy o» 

 Hydrogen Aloma rnrri^d bv the Same Carbon Atom. Part I.-> 

 J. Brfinated ! The TnHuenee of Halta upon the Ohemlral Knnlllbrla 

 In Bnlntlon.— H. Hepwnrth : The Action of the Orlgnard Reagent 

 OB Certain NItrle Eatera.— O. T. Morgan and H. D. I. Dt»» < 



