120 
inside the equations have to be modified by adding the 
convection current to the displacement current, as done 
by Fitzgerald.—The contact-phenomena at the junction of 
Lias and Dolerite at Portrush: Prof. G. A. J. Cole. The 
paper describes the microscopic characters of the rocks 
at and near the junction of Dolerite (or basalt) and cal- 
careous Lias shale at Portrush—a junction of considerable 
interest in the history of geological opinion. The silicifi- 
cation of the shale is accompanied by the production of 
abundant minute crystals of a pale green pyroxene. The 
“ bronzite ’ of Portlock and Oldham, named by them with 
some hesitation, proves to be a brown mica, locally de- 
veloped after the formation of the pyroxene. The author 
has had the advantage of using the original specimens 
collected by Portlock’s survey. Some details as to the 
later sheets and veins of dolerite are given, and the occur- 
rence in them of differentiation, by gravitation of ferro- 
magnesian minerals to their under surfaces, is compared 
with similar cases elsewhere. 
Paris. 
Academy of Sciences, November 19.—M. H. Poincaré 
in the chair.—The inflorescence of the seed-bearing ferns 
of the Culm and the Coal-measures: M. Grand’Eury.— 
Observations of the new comet (1906g), made at the 
Observatory of Besancon with the bent equatorial: P. 
Chofardet.—Curves reproduced periodically by the trans- 
formation (X, Y; x,y, y’): S. Lattes.—A family of hyper- 
elliptic surfaces of the fourth order: L. Remy.—A theory 
of magneto-optic phenomena in crystals: Jean Becquerel. 
—The heat of combustion and formation of some cyclic 
nitrogen compounds: P. Lemoult. From the experimental 
data given in this paper the author calculates the thermal 
changes in passing from nitro-compounds to oxyazo-com- 
pounds, from the latter to azo-bodies, from azo- to hydrazo- 
compounds, and from the last to amines.—The isomorphous 
crystals of lead nitrate and barium nitrate: P. Gaubert. 
A mixed crystal of lead and barium nitrates is not homo- 
geneous, in spite of its transparence and limpidity: it is 
constructed of groups of pyramids the composition of which 
varies with the nature of the faces to which they corre- 
spond. The results are applied to the explanation of a 
similar structure frequently found in minerals.—The dis- 
tribution of Anopheles maculipennis in the neighbourhood 
of Lyons: A. Conte and C. Vaney. The reduction in the 
amount of malaria in this region is much greater than 
would be expected from the slight reduction in the numbers 
of mosquitoes that has taken place in recent years. The 
possible causes of this are discussed.—The consumption of 
the glucose of the blood by the tissue of the mammary 
gland: M. Kaufmann and H. Magne. The experiments 
cited are all in favour of the theory of the transformation 
of the glucose into lactose in the mammary tissue in 
secretory activity—Study of the variations of the mass of 
the blood in man: Gabriel Arthaud.—Chromotropism and 
its artificial inversion: Romuald Minkiewicz.—The stroma 
of the red corpuscles: MM. Piettre and Vila. A new 
method of separating the stroma is described.—Experi- 
mental researches demonstrating that anthracosis of the 
lungs is due to inhalation, and not to the deglutition of 
atmospheric dust : .—The presence of the _ spiro- 
cheta of Schaudinn in the testicle of a new-born 
syphilitic infant: Ch. Fouquet.—The fractionation of 
the rare gases in mineral waters: the proportions of 
helium: Charles Moureu and Robert Biquard.—The 
hydrology of the Bulgarian Dobroudja: M. De Launay. 
DIARY OF SOCIETIES. 
FRIDAY, NoveEmMBER 30. 
Roya. Society, at 4.—Anniversary Meeting. 
INsTITUTION OF CIvIL ENGINEERS, at 8.—Applications of Electricity in 
Printing-works: P. A. Spalding. 
InsTITUTION OF MECHANICAL ENGINEERS, at 8.—Steam as a Motive 
Power for Public Service Vehicles (Discussion): T. Clarkson. 
MONDAY, DECEMBER 3- 
SocioLtocicat Society (Research Meeting), at 8.—Mating, Marriage and 
the Status of Women: S. S. Buckman. 
Society oF CHemicat InNpustrRy, at 8.—The Direct Estimation of 
Antimony : H. W. Rowell —Bacterial Method of Investigating Disin- 
fectants: M. Wynter Blyth.—The Detannisation of ‘Solutions in the 
Analysis of Tanning Materials: Dr. J. Gordon Parker and H. G. 
Bennett. 
Society of Arts, at 8.—Artificial Fertilisers : 
A. D. Hail. 
NO. 1935, VOL. 75 | 
Nitrogenous Fertilisers: 
NATURE 
| NovEMBER 29, 1906 
TUESDAY, DECEMBER 4. 
Society oF ARTS, at 4.30.—The Cape to Cairo Railway: The Hon. Sir 
Lewis Michell. 
INSTITUTION OF CiviIL ENGINEERS, at 8.—The Talla Water-supply of the 
Edinburgh and District Waterworks (Discussion): W. A. P. Tait,—Re- 
pairing a Limestone-concrete Aqueduct: M. R. Barnett.—The Yield of 
Catchment-areas : E. P. Hill. 
ANTHROPOLOGICAL INSTITUTE, at 8.15.—Village Deities in Southern 
India: Lord Bishop of Madras. 
WEDNESDAY, DECEMBER 5. 
ENTOMOLOGICAL SOCIETY, at 8. 
Society or Arts, at 8.—The Metric System: Sir Charles M. Watson. 
GEoLocicaL Society, at 8.—On the Geological Conditions which have 
contributed to the Success of the Artesian Boring for Water at Lincoln : 
Prof. Edward Hull, F.R.S.—Notes on the Raised Beaches of Taltal 
(Northern Chile): O. H. Evans. 
THURSDAY, DECEMBER 6. 
RoyaL Society, at 4.30.—Probable Papers: A Comparison of Values of 
the Magnetic Elements deduced from the British Magnetic Survey of 
189r with Recent Observation: W. Ellis, F.R.S.—The Theory of the 
Composition of Numbers, Part ii.: Major P. A. MacMahon, F.R.S.— 
On the Transpiration Current in Plants: Prof. Henry H. Dixon.—The 
Theory of Photographic Processes, Part iii, The Latent Image and its 
Destruction, an Abstract: S. E. Sheppard and C. E. K. Mees.—The 
Chemistry of Globulin: W. Sutherland. 
CHEMICAL SOCIETY, at 8.30.—The Liquid Volume of a Dissolved Sub- 
stance: J. S. Lumsden.—Some Derivatives of Renzophenone; Synthesis 
of Substances occurring in Coco-bark (preliminary notice): W. H. 
Perkin, jun., and R, Robinson.—A Synthesis of Terebic, Terpenylic 
and Homoterpenylic Acids: J. L. Simonsen. 
LINNEAN Society, at 8.—Pagers: A Contribution to the Physiology of the 
Museum Beetle, Anthrenus museorum (Linn.): Prof. A. Ewart.—Note 
on the Origin of the Name Chermes or Kermes: E. R. Burdon.— 
Exhibitions: An Abnormal Specimen of a Dab with Three Eyes: Dr. 
A. T. Masterman.—A Note on Siegesbeckia orientalis, Linn.: Rev. H. 
Purefoy FitzGerald. 
LNsTITUTION OF ELECTRICAL ENGINEERS, at 8.—Selection and Testing of 
Materials for Construction of Electric Machinery : Prof. J. Epstein. 
CONTENTS. 
PAGE 
Alternating Currents .. . ; 97 
The Cell and Heredity. ByJ.B.F....... .. 08 
Disease and its Prevention. By Prof. R. T. 
Hewlett 99 
Captains of Chemical Industry. — By Dr. T. E, 
AUSF, (CylEh_IMelsoish 6 le bod so 3 100 
Aids to Photography é IOI 
Our Book Shelf : — 
McAlpine: *‘ The Rusts of Australia ; their Structure, 
Nature, and Classification” . we) 1. ++; CeO 
Prince: ‘‘The Dissociation of a Personality, a Bio- 
graphical Study in Abnormal Psychology.”— 
A. D.L. Meee > 6 Sirecsti oreo oo Hee 
‘The ‘ Lloyd’ Guide to Australasia” ...... 102 
Letters to the Editor: 
Presence of Neon in Radio-active Minerals.—Hon. 
Rj. Strutt, FoR ISI. ne + sn eee OS: 
Radium and Helium.—Dr. B. Walter 102 
Magnetostriction.—D. O. S. Davies . . . ... . 102 
Photography in Natural Colours.—Julius Rhein- 
bergaer ee: cea Ete chal) el LOR 
Antarctic Exploration, (J///ustrated.) By J. W. G.. 103 
Syntonic Wireless Telegraphy. By J. L. M. a6 WOR 
Marine Biological Association and International 
Fishery\lnvestigations Goo 0 9. o. | aeeeeenOO 
Notesists 0 eo io eacaeetree ae. + epitome lO? 
Our Astronomical Column :— 
Astronomical Occurrences in December ... . 6 0 
Comets 1906g (Thiele) and 1906/ (Metcalf) . 5 ant 
Photographic Observations of Giacobini’s 1905 Comet I11 
Sun-spots and Magnetism MM Ooo oo ih 
The Solar Eclipse of Next January ........ II! 
Naked-eye Observations of Venus. . 2 eas 
The International Chart and Catalogue ...... III 
The Perseids, 1906 , eet 23) 3) te alee 
Recent Experiments on the Crystallisation of 
Minerals. (With Diagram.) By Dr. T. M. Lowry 112 
Character and Cause of Sun-spot Spectra, .... 113 
Anthropological Notes) .))5 0: aera 114 
Geological Research in South Africa. (J//lustrated.) 
By WWieGrye rss sy ia ankle panera ened Oi ee 
The Scope and Problems of Protozoology. By Prof. 
EVAWMinchint. 7). 35 Saaeehe =i }78 721 Rete 
University and Educational Intelligence ..... II7 
Societies and Academies. ............ 118 
Diary/offSocieties!.. 2. a t-lesie-mn asl lel piste ZO 
