[ een 
ABADY (J.) on the Simmance- 
Abady flicker photometer, 341. 
Aerodynamics, on the principles of, 
667. 
Aither, on double refraction in 
matter moving through the, 317 ; 
neutron structure of the, 440; on 
the ascertained absence of effects 
of motion through the, in relation 
to the constitution of matter, 
621. 
Ageregates, on the transfinite car- 
dinal numbers of well-ordered, 61. 
Air, on the condensation method of 
demonstrating the ionization of, 
681. 
Allan (Dr. G. E.) on the magnetism 
of basalt, 45. 
Allan (8. J.) on the radioactivity of 
the atmosphere, 140. 
Ammeter, on a hot-wire, for the 
measurement of small alternating 
currents, 595. 
Andrews (EK. 8.) on the viscosity of 
pitch-like substances, 347. 
Angle, on the division of an, in an 
arbitrary ratio, 75. 
Appleyard (R.) on the conducto- 
meter, 281. 
Arc, on the, in metallic vapours, 95. 
Astigmatic pencil, on the standard, 
700 
Atmosphere, on the radioactivity of 
the, 140. 
Atmospheres, on the escape of gases 
from, 690. 
Atomic vibration, on the nature of, 
420, 
Atoms, on the structure of, 237 ; on 
the dielectric capacity of, 402. 
Austin (L. W.) on the disintegration 
of the platinum metals in different 
gases, 388. 
Barkla (C. G.) on the energy of 
secondary Rontgen radiation, 543. 

Barnego 
202. 
Barnes (J.) on the analysis of bright 
spectrum lines, 485. 
Basalt, on the magnetism of, 45. 
Bennett (W.), notes on non-homo- 
centric pencils, 700, 706. 
Bismuth, on the Thomson effect in 
alloys of, 560. 
Books, new:—Nordmann’s Hssai 
sur le réle des ondes Hertziennes - 
en Astronomie Physique, 77 ; 
Fleming’s Handbook tor the Elec- 
trical Laboratory and Testing 
Room, 233; Michelson’s Light 
Waves and Their Uses, 235; 
Mathias’s Le Point Critique des 
Corps Purs, 235; Classen’s Aus- 
gewahlte Methoden der analyt- 
ischen Chemie, 286; Annuaire 
pour Van 1904, 236; Perrin’s 
Traité de Chimie Physique, 307 ; 
Planck’s Treatise on Thermody- 
namics, 308 ; Ostwald’s Die Schule 
der Chemie, 309; Pernter’s Al- 
lerle: Methoden, das Wetter zu 
prophezeien, 3810; Poincaré’s La 
Science et lHypothése, 310; 
Stark’s Die Dissoziierung und 
Umwandlung Chemischer Atome, 
414; Whittaker’s Course of Mo- 
dern Analysis,605; Hilton’s Mathe- 
matical Crystallography, 605; 
Duhem’s Thermodynamics and 
Chemistry, 606; Young’s Frac- 
tional Distillation, 607. 
Borgnet’s method of dividing an 
angle in an arbitrary ratio, on, 
76. 
Boulton (W. 8.) on the igneous rocks 
at Spring Cove, 3158. 
Brace (Prof. D. B.) on double re- 
fraction in matter moving through 
the ether, 317. 
