288 
NATOTE 
[ JANUARY 17, 1907 
the roots of different shrubs and trees. The species which 
forms the subject of this paper, viz. Hydnora africana, 
uses the common milkbush of the karroo and karroid 
regions of the interior, viz. Euphorbia mauritanica, as its 
host. 
has observed some organ which has hitherto escaped the 
attention of botanists. Each of the three segments of the 
perianth bears a large snow-white body on its inner side, 
while the remainder of the inner surface of the flower is 
of a bright flesh colour. These three white bodies are not 
mentioned in any existing description of Hydnora. 
Examination of the validity of an approximate solution of 
a certain velocity equation: Prof. A. Brown. The question 
here considered is the part played by the initial value of 
y (A) in the solution of the equation 
dy 
dt 
It is commonly assumed that, for a small initial value 
of y, the method of successive approximation is applicable, 
the proviso being sometimes made that the value of v, so 
obtained, be also small. This assumption is shown in the 
paper to be not necessarily correct, or in certain cases to 
lead to a rapid approximation when correct.—List of Natal 
plants: J. Medley Wood. 
=A +Ay 7" -agy+ — — —.. 
DIARY OF SOCIETIES. 
THURSDAY, January 17- 
Roya Society, at 4.30.—The Natural and Induced Resistance of Mice to 
the Growth of Cancer; Dr. E. F. Bashford, J. A. Murray, and Dr. W. 
Cramer.—On the Pathclogy of the Dropsy produced by Obstruction of 
the Superior and Inferior Vena Cava and the Portal Vein; Preliminary 
Communication: Dr. C. Bolton.—Ohservations on the Life-history of 
Adelea ovata, Aimé Schneider; witha Note ona New Gregarine from 
the Gut of Lithobius forficatus : C. C. Dobell. 
CHEMICAL Society, at 8.30.—The Relation between Absorption Spectra 
and Optical Rotatory Power, Part i., The Effect of Unsaturation and 
Stereo-isomerism: A. W. Stewart.—Organic Derivatives of Silicon, 
Part ii., The Synthesis of Dl-ethyl, Propyl Benzyl Silicol, its Sulphona- 
tion, and the Resolution of the Sulphonic Derivatives into Optically 
Active Compounds: F. S. Kipping.—The Association of Phenols in 
the Liguid Condition : J. T. Hewitt and T. F. Winmill.—A New Mercuric 
Oxychloride : J. T. Hewitt.—Aromatic Selenonium Bases: S. Smiles and 
T. P. Hilditch.—The Relation of Colour and Fluorescence to Constitu- 
tion: A. G. Green.—The Constitution of Silver Nitrite, a Correction: E. 
Divers.—Preparation of Chromyl Chloride: F. D. Law and F. -M. 
Perkin.—Tetraketopiperazine ; A. T. de Moulpied and A. Rule. 
Royat INSTITUTION, at 3.—Recent Advances in the Exploration of the 
Atmosphere: Dr. W. N. Shaw, F.R.S. 
LinnEAN Society, at 8.—Platanthera chlorantha, Custor, var. trical- 
carata: W. Botting Hemsley, F.R.S.—Acanthacea of Insular Malaya : 
the late Mr. C. B. Clarke, F.R.S.—A Freshwater Isopod from Calcutta: 
Rev. T. R. R. Stebbing, F.R.S. 
INSTITUTION OF MINING AND METALLURGY, at 8.—Some Sampling 
Results : E. H. Garthwaite.—The Assay of Silver Bullion by Volhard’s 
Method: E.°A. Smith.—Water Skip with Automatic Discharge: W. R. 
Francis.—Breaking Piece for a Swinging-Jaw_Rockbreaker: “G. E. 
Brown.—A Visit to the De Beers Consolidated Diamond Mines: E. P. 
Rathbone. 
FRIDAY, January 18. 
Royat INnsTITUTION, at 9.—Fifty Years of Explosives : Sir Andrew Noble, 
Bart., K.C.B., F.R-S. 
INSTITUTION OF MECHANICAL ENGINEERS, at 8.—Adjourned Discussion 
on Lighting of Railway Premises, Indoor and Outdoor: H. Fowler.— 
Kighth Report to the Alloys Research Committee : On the Properties of 
the Alloys of Aluminium and Copper; Prof. H. C. H. Carpenter and 
C. A. Edwards. 
MONDAY, January 21. 
Victoria INSTITUTE, at 4.30.—The Scriptural Idea of Miracles: Rev. 
Canon Girdlestone. 
TUESDAY, JANUARY 22. 
Roya. INSTITUTION, at 3.—The Sculpture of Aegina in Relation to 
Recent Discovery: Prof. Percy Gardner. 
ANTHROPOLOGICAL INSTITUTE, at 8.30.—Annual General Meeting.— 
Presidential Address: The Burial Mounds and Dolmens of the Early 
Emperors of Japan: Prof. W. Gowland. 
UnsTITUTION Of CivIL ENGINEERS, at 8.—Internal-Combustion Engines 
for Marine Purposes: J. T. Milton. 
WEDNESDAY, JANUARY 23. 
Society of Arts, at 8.—The Isthmus of Panama: Philippe Bunan- 
Varilla. 
ENTOMOLOGICAL SocieTy, at 8.—Annual Meeting. 
GEOLOGICAL SociETy, at 8.—The Geology of the Zambezi Basin around 
the Batoka Gorge (Rhodesia): G. W. Lamplugh, F.R.S: With Petro- 
graphical Notes by H. H. Thomas. 
THURSDAY, January 24- 
Roya Society, at 4.30.—Probable Papers: Experiments on the Dark 
Space in Vacuum Tubes : Sir William Crookes, F.R.S.—Ona New Iron 
NO. 1942, VOL. 75 | 
It is in the structure of the flower that the author 
Carbonyl, and on the Action of Light and of Heat on the Iron Car- 
bonyls : Sir James Dewar, F.R.S., and Dr. H. O. Jones.—Note on the 
Application of Van der Waals’s Equation to Solutions: The Earl of 
Berkeley.—On the Presence of Europiumin Stars : J. Lunt. 
Roya InsTiruTIoN, at 3.—Recent Advances in the Exploration of the 
Atmosphere: Dr. W. N. Shaw, F.R.S. 
Society oF ARTS, at 4.30.—The Bhils of Western India: Captain E. 
Barnes. 
INstTITUTION OF ELECTRICAL ENGINEERS, at 8.—Investigations on Light 
Standards and the Present Condition of the High-Voltage Glow Lamp: 
C. C. Paterson. 
FRIDAY, January 25. 
Roya INSTITUTION, at 9. 
Puysicat Society, at 5.—The Strength and Bebaviour of Brittle 
Materials under Combined Stress: W. A. Scoble.—A Spectrophotometer: 
F. Twyman.—Photographs of Electric Sparizs : K. J. Tarrant. 
INSTITUTION OF CivIL ENGINEERS, at 8.—Alternating-Current Com 
mutator Motors: C. A. Ablett. 
CONTENTS. PAGE 
Social Problems in America, By Prof. John Perry, 
FRESE tits ao 3 a 2 eee ee 
NiavaliChemistry? -) <7) temeemeierstre e-em 266 
Formation of lce on the St. Lawrence ... . 267 
Romantic Undial 4... <)207) eee: (20) ee 
Our Book Shelf :— 
De Vries: ‘Species and Varieties: Their Origin by 
Mutation. ”"—A. D: D! <3 0-2... et 268 
Cunynghame: ‘‘ Time and Clocks: a Description of 
Ancient and Modern Methods of Measuring Time.” 
—W,, BiRin 5. 0 bytes: =) eee 
Thomson: ‘*Conduction of Electricity through 
Gases” ice bs 2) 5 OG. | ee 
Shenstone: ‘‘The New Physics and Chemistry: a 
Series of Popular Essays on Physical and Chemical 
Subjects:?). . 4s... posse ls) 9 ee) 
Thompson: ‘‘ The Manufacture of Light”. . . . . 269 
Hogner: ‘‘ Lichtstrahlung und Beleuchtung” . . . 269 
Kirby: ‘‘A Synonymic Catalogue of Orthoptera, 
vole die” soa gis =) Aleem os ops) eee 
Letters to the Editor :— 
Production of Radium from Actinium.—Prof, E. 
Rutherford, F-RiS: 2. cages =<": See 
Helium and Argon in Common Rocks.—Hon. R. J. 
Strutt, F:R.Se 92 fh) cee gees) sy oe eee 
Ionisation and Absorption and Anomalous Dispersion. 
Dr, Gi/Ae Schott “a tase o!: ke eee 
The Millais British Mammals. (J///ustrated.) By 
Ri oe. <a fees ss - 7 ee 
The Mathematical Tripos at Cambridge. By Prof. 
John} Perry, HOR{SSecwe 4 > eee 
The International Seismological Association . 274 
Science in Higher Education . 275 
Cornelius O'Sullivan, F.R.S. 277. 
Notes Re. 20 LO: ‘core Pema oso. 247/7/ 
Our Astronomical Column :— 
The Temperature of the Moon .......... 281 
The Helium Line, D,, in the Solar Spectrum. . . 281 
A White Spot on Jupiter's Third Satellite... . . 281 
A Remarkable"Nebula.. ... .0.-2.2 > eee 
Periodical Comet Due to Returnin 1907. . ... . 282 
Orbits of Three Double Stars‘ 2 . . J... 2) 282 
The Duke of the Abruzzi’s Ascents in the Ruwen- 
zori Range. (L//ustrated.) sys fence) esteem 
Meteorology in Peru. © (///ustvated.) By W. M. 283 
The Association of Economic Biologists 284 
The Public School Science Masters’ Association 285 
University and Educational Intelligence .. . . . 286 
Societiesiand Academies. {2 7 2.6) ons eeaoe 
Diary of Societies ene a) 6. Sele oa 288 
