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editorial covpeanen ide Prof. P. F. Smith. Pp. xv+ 
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Lectures on the Theory of Functions 
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Hortus Mortolensis Enumeratio Plantarum in 
Horto Mortolensi Cultarum. Alphabetical Catalogue 
of Plants Growing in the Garden of the late Sir 
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Ventimiglia, Italy. By IN Berger. Pp. .xxiv+ 
468+vi plates. (London: West, Newman and Co.) 
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Smithsonian Miscellaneous Collections. Vol. 59, 
No. 1:—The Natives of Kharga Oasis, Egypt. By 
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The Vulgate Version of the Arthurian Romances. 
Edited from the Manuscripts in the British Museum 
by H. O. Sommer. Vol. v. Le Livre de Lancelot 
del lac. Part iii. Pp. 474. (Washington: Carnegie 
Institution.) 
Guide to the Manuscript Materials relating to 
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Prof. M. D. Learned. Pp. vii+352. (Washington : 
Carnegie Institution.) 
A Physical Study of the Firefly. 
lentz. Pp. 46+plate. (Washington : 
tution.) 
Verhandlungen der 
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IIAARY OF SOCIETIES. 
THURSDAY, June 6. 
Rovat Society, at 4.30.—Croonian Lecture: The Process of Excitation 
in Nerve and Muscle: Keith Lucas. 
Royat InstituTion, at 3.—On X-Rays and Matter: Prof. C. G. Barkla. 
InsTITUTION OF MintnG ENGINEERS. at 11 a m.—Address by President : 
W. E. Garforth.—Why Leave Shaft-pillars? W. H. and B. H. Pickering. 
—Safety-devices in Connection with Electrical Machinery and Appliances 
for Coal- -mines: D. Bowen and W. E. French.—A Rope-driven Coal- 
cutter: W. L. Spence. 
Taeenn Society, at 8.—The Development of the Cod, Gadus morrhua, 
Linn. : Prof. A. Mrek.—Lantern-slides of Orchids recently observed in 
Suseex: E. J. Bedford.—Palzontographical relations of Antarctica; 
C. Hedley.—Lantern-slides illustrating the Fauna and Flora of the 
Falkland Islands: R. Vallentin. 
FRIDAY, June 7. 
Roya Institution, at 9.—Lord Lister: Sir William Macewen. 
SATURDAY, June 8. 
Rovat InsTITUTION, at 3.—The Weather and the Utilities of Forecasts: 
Willis L. Moore. 
MONDAY, June 10. 
Rovyar. Grocrapuicat Society, at 8.30.—The Garden of Eden: Sir 
William Willcocks, K.C.M.G. 
NO. 2223, VOL. 89] 
[June 6, 1912 
TUESDAY, June 11. 
RovaL ANTHROPOLOGICAL INSTITUTE, at 8.15.—Excavations in’ the 
Coldoun, Ancient Stone Monuments and Description of Human 
Remains: F. J. Bennett and Dr. A. Keith. 
WEDNESDAY, June 12. 
AERONAUTICAL SOCIETY, ut 8.30.—Hydro-aéroplanes : G. Holt Thomas. 
THURSDAY, June 13. 
Royal. Society, at 4.30.—Prolable Papers: A Chemically Active Modi- 
fication of Nitrogen, produced by the Electric Discharge, IV..: Hon. R. 
J. Strutt, F.R.S$.—(1) On the Series Lines in the Arc Spectrum of 
aa (2) On the Constitution of the Mercury Green Line A=546r 
AU and on the Magnetic Resolution of its Satellites by an Echelon 
Grating: Prof. J. C. McLennan.—(1) On the Convergence of certain 
Series involving the Fourier Constants of a Function. (2) On Classes of 
Summable Functions and their Fourier Series : Prof. W. H, Young, F.R.S- 
—The Number of 8 Particles emitted in the Transformation of Radium : 
H. G. Y. Moseley.—Portland Experiments on the Flow of Oil: S. D. 
Carothers.—On a Form of the Solution of Laplace's Equation suitable for 
Problems relating to two Spheres: GB. Jeffery.—On the Emission 
Velocities of Photo-Electrons: A. Ll. Hughes. 
FRIDAY, June 14. 
Rovat Institution, at 9.—Unknown Parts of South America: A. He 
Savage Landor. 
Gro.oaists’ AssociaTIon, at 8.—The Geology of West Mayo and Sire 
with special reference to the August Long Excursion: Prof. A. J. Cole. 
Roya ASTRONOMICAL SOCIETY, at 5. 
Puysicat Society, at 8.—Demonstration of a Method of Determining 
very small Differences of Density: T. H. Blakesley.--The Maximum 
Sensibility of a Duddell Vibration Galvanometer: Dr. F. H. Haworth.— 
An Accurate Examination of the Steinmetz Index for Transformer Iron, 
Stalloy and Cast Iron: F. Stroude. 
MALAcoLoGcicaL Society, at 8.—On a collection of Molluscs collected by 
Mr. E. Jacobson in Java: M. M. Schepman.—Description of Thirty- 
three New Species of Gastropoda from the Persian Gulf, Gulf of Oman, 
and Arabian Sea: J. Cosmo Melvill.—Note on the™ Generic Name 
Pectunculus : Wm. H. Dall.—Note on Ianthina species: Tom Iredale.— 
Egyptian Non-marine Molluscs: Maxwell Smith. 
CONTENTS. PAGE 
Technical Chemical Analysis ..... it am 
The Ancestry of Flowering Plants ....... 342 
Physical Text-books . perme ha) SUS, 
The Testing of Building Stones A hy eh ee ae 
OurpgBookshelf) |. (heat apo eS 
Letters to the Editor :— 
Discovery of Fossils in the Chert and Black Shale | 
Series at Aberfoyle.-—Dr. Thomas J. Jehu ~ S47: 
The Protection of Nature in South Bavaria. —Dr. C. 
Ciprosseus .-: = 347 
A Simple Eclipse Experiment _Ww,. G. Royal: 
Dawson : “ee . 347 
Solar Halos on May 17. C50) “Bartrum . mate 348) 
Earthquake of May 23.—Rev. W. Sidgreaves, Sa 348; 
' Anatomy of the Bee’s Sting.—Dr. Percy E. pik 
mann. . -f aehebtoe CaS) 
Clouds.and Shadows.—Dr. T.C. Porter, 2) 4am 348 
Red Water.—Cyril Crossland... . + ies SRS GOF 
Zoological Nomenclature. — Prof. Sydney J. 
Hickson, F.R.S. = 5 eee, 
The Dundee Meeting of the Britich ‘Association. 
By Prof. D’Arcy W. Thompson, C.B....... 349 
m@hesCeylon Pearl. Fishery) tangs) -) =) i.e 5 
WOfeSierne. Sold 6 eC oo GE 
Our Metonomical Column — 
The Solar Eclipse of April 17. (Zé/estrated.) . . . 355 
Origin of the ‘‘ Earth Light <. ~ . roe © SOS 
‘bhewMinor Planet 1orr Mies. 2) lee hO 
The Royal Observatory, Greenwich ..... 356 
Eighteenth International Congress of Americanists. 
By Dr, A. C. Haddon, F.R.S... .. 2h 357 
The Annual Conference of the pecociation of 
Teachers in Technical Institutions : 1. 358 
The Crystallisation of Metals. (Wiustrated.) By 
DruCecil Hy Desch --. = . 2 4359) 
Sinhalese Iron and Steel of Aucians Gein Us 
trated.) By Sir Robert Hadfield, F.R.S.... . 360 
University and Educational Intelligence .. . . +. 362 
Societies’and) Academies!) Sasa geerae) «i. vals sO 
BooksmReceivedt “soc ueememrcne) ou” cong OS 
DianyjofiSocieties . “: ) 4 0) Maem tess) oe oor 
