I50 



NA TURE 



[December 3, 1908 



the east end of the Tygerberg:, in order to study tne evidence 

 for Dr. Sandberg's views. It seemed to him that the anti- 

 clinal structure of the range was clear, for at many 

 places in it the Witteberg beds were seen to dip under 

 the Dwyka on either side. The masses of quartzite in 

 the Dwyka described by Dr. Sandberg appeared to be 

 parts of that formation, i.e. originally sandy sediments 

 with few or no pebbles, formed at the same time as part 

 of the tillitc. Similar quartzites in the Dwyka had been 



1. scribed from several localities in the south of the colony. 

 All examination of Sand River valley showed not only 



li.'it it was extremely unlikely that a 'mass of Witteberg 

 beds underlay the surface, for those beds were not known 

 to form valleys like that of Sand River, but that where 

 outcrops of rock in situ occurred they belonged to the 

 Ecca series. He had come to the conclusion that it was 

 unnecessary to assume the presence of a great overturned 

 fold to account for the appearances at Tvgerberg, and that 

 the earlier observers were quite justified in ascribing an 

 anticlinal structure to the range. 



DIARY OF SOCIETIES. 



• THURSDA y, December 3. 

 LiN-NEAN Society, at 8.— Biscayan Plankton, the Ostracoda: Dr. G. 



Herbert Fowler.— Note on J„tipeni3 ta.x!/oUa, Hook, and Arm. : Bunzo 



Hayata.— Mimicry in Spiders: R. I. Pocock. 

 RcjNTGEV Society, at 8.15 — Phenomena observed in Electrical Currents of 



Continuous Oscillation : Dr. H. Manders. 

 Civil and MKCHA^■ICAL Engineers' Society, at 8.— The Influence of 



Track upon Railway and Tramway Carriages: J. S. Warner. 



FRIDAY, December 4. 

 Cfologists' Association, at 8.— Personal E.vperiences of the Jamaica 



Earthquake of 1907 : Dr. Vaughan Cornish. 

 Institution of Civil Engineers, al 8.— The Design and Erection of 



a Plate-girder Bridge over the River Lee, at Broxbourne : L. W. 



Atcherley. 



MONDAY, December 7. 



Society of Chemical Industry, at 8.— Cellulose 



Industry : C. F. Cross and E. J. Bevan. 

 Royal Society of Arts, at 8.— Twenty Years Progre 



Oscar Guttmann. 

 RovAL Geograf'hical Society, at 8.30.— The Danish North 



land Expedition : Lieut. A. TrolM. 



Chemical 

 Explosives : 

 Green - 



compared with halfa-century ago : Prof. Edward Hull, F.R.S. 



TUESDAY, December 8. 



Rotal Anthroi'Ological Institute, at S.rs.— Notes on Early Ornament : 

 Dr. C. H. Re.ad.— The Lushai-Kuki Clans : Lt -Col. J. Shakespear. 



Institution of Civil Engineers, at 8.— The Rotherhithe Tunnel : E. H. 

 labor. 



WEDNESDAY, December 9. 



THURSDAY, December 10. 



Royal Society, at ^.^a.—ProbaHe Pafic-rs : On Reciprocal Innervation of 

 Antagonistic Muscles. Xllth Note : Proprioceptive Reflexes. Xlllth 

 Note : On the Antagonism between Reflex Inhibition and Reflex Excita- 

 tion : Prof, C. S. Sherrington, F.R.S.— Electrolytes and Colloids. The 

 Physical State of Gluten : Prof. T. B. Wood and W. B. Hardy, F.R.S.— 

 On the Specific Heats of Air and CO at Atmospheric Pressure by the 

 Continuous Electric Method at lo" and loo'C. : W.F.G. Swann. — Potential 

 Gradient in Glow Discharges from a Point to a Plane : J. W. Bispham.— 

 The Extension of Cracks in an Isotropic Material : A. Mallock, F.R S.— 

 Results of Magnetic Observations at Stations on the Coasts of the British 

 Isles, 1907 : Commander L. Chetwynd, R. N.— The Rotation of the Electric 

 Arc in a Radial Magnetic Field : J. Nicol.— On Anomalies in the Intensity 

 in Difl"racted Spectra : H. C. Pocklington, F.R.S.— The Isothermal Layer 



of the Atmosphere and Atmospheric Radiation : E. Gold Contribution 



the^^Osmotic Theory of Solution : The Earl of Berkeley, F.R.S., and 



C. V. Burl 



-A Compai 



Spectra obtained 



ary General Meethis). 

 :rjc Machinery : J. C. 

 Commercial Electric 



----- r loftheRadi 



by Diflerent Observers : T. Royds. 

 Institution of Electrical Engineers, At8{0?-^i) 



—Output and Economy Limits of Dynamo E1->-t 



Macfarlane and H. Barge. -Praiaile Papi 



Heatmg : J. Roberts. 

 Royal Society of Arts, at 4.30.— The Birds of India : Douglas Dewar. 

 Mathematical Society, at 5.30.— On the Propagation of Sound Waves 



Vertically in the Atmosphere: Prof. H. Lamb.— (i) On Sir William 

 niton's Fluctuating Functions ; (2) On the Representation of 



Rowan Ha 



NO. 2040, VOL. 79] 



I by Series of Bessel's Functions: Dr. E. W. Hobson.— Theory 

 ofCauchys Prii.cifal Values (Fourth Paper): G. H. Hardy.-, Solution of 

 a Problem of Mersenne's : Dr. T. Sluatt.— Note on a Continued Fraction 

 Equivalent to the Remainder after n Terms of Taylor's Series : Prof. L. J. 

 Rogers.— Solid Angles and Potentials of Plane Discs : Balak Ram 



FRID.AY, December it. 



Physical Society, at 8. 



Malacological Society, at 8. — On Ca7-i'lia pilshryi, n.sp. : E. R. Sykes. 

 -The Radute of British Helicids. Pt. II.: Rev. E. W. Bowell.— New 

 Species of Plectop5lis: G. K. Gude.— A Preliminary List of Recent 

 Middlesex Mollusca : J. E. Cowper and A Loydell.— The Application of 

 the Names Gomphina. Marcia, Hemitapes and Katelysia : A. J. Jukes- 



CONTENTS. PAGE 



Physics, Old and New 121 



Biography of Spencer 122 



Ocular Pathology 125 



A Study in Seaweeds 126 



Our Book Shelf:— 



Hall: "TheSoil."~M. J. R. D 127 



H. P H. : "The Stars of the Year"; "Star Calen- 

 dar for 1909"; "The Star Almanack, 1909." — 



W. E. Rolston 127 



Lundbeck : " Diptera Danica " 127 



Bamford : " Moving Loads on Railway Underbridges, 

 including diagrams of Bending Moments and 

 Shearing Forces, and Tables of Equivalest Uniform 



Live Loads" 12S 



Lancaster: " Praciing Floor Malting" 128 



Letters to the Editor; — 



Students' Physical Laboratories.— Sir Oliver Lodge, 



F.R.S 128 



Apparent Decay of Radium.— Sir William Ramsay, 



K.C.B., F.R.S . . 129 



Production of Helium from Uranium. — Frederick 



Soddy . . 129 



An Annotated Copy of Newton's " Principia." — 



Bruce Smith 130 



The Semi-diurnal Barometric Oscillation. — W. H. 



Dines, F.R.S 130 



The Fauna of the Magellan Region. — Joseph A. 



Clubb 130 



A Disclaimer. — Chas. H. 'Walter 130 



Two Gift-books on Geology. (Illustrated.) By 



G. A. J. C 131 



The Archasological Survey of Nubia 132 



Himalayan Physiography. (W'itli Cliail.) By 



T. H. H 132 



Anniversary Meeting of the Royal Society .... 134 



Notes 138 



Our Astronomical Column : — 



Morehouse's Comet, i9o8(" 142 



The Change in the Physical Condition of Nova 



Persei 143 



Refraction due to Jupiter's Atmosphere 143 



Observalions of the Zodiacal Light 143 



L'Annuaire du Bureau des Longitudes 143 



The Correlation of the Teaching of Mathematics 



and Science 143 



Scientific Investigations of Fisheries. By W. C. M. 144 

 The European Population of the United States . . 145 



University and Educational Intelligence 146 



Societies and Academies 146 



Diary of Societies 150 



