760 
Bragg (Prof. W. H.) on the absorp- 
tion of a rays and on the classi- 
fication of the a rays from radium, 
719; on the ionization curves of 
radium, 726. 
Brooks (Miss H.) on the decay of 
the excited radioactivity from 
thorium, radium, and actinium, 
573. 
Burbury (S. H.) on the theory of 
diminishing entropy, 43. 
Burton (E. F.) on a radioactive gas 
from crude petroleum, 498. 
Cathode disintegration in the dis- 
charge through gases at low 
pressures, on, 145. 
Chabot (J. J. I.) on an arrange- 
ment for reading off deflexions, 
11h, 
Cheinical dissociation and electrical 
conductivity, on, 437. 
Chree (Dr. C.) on the law of action 
between magnets and its bearing 
on the determination of the hori- 
zontal component of the earth’s 
magnetic force with unifilar mag- 
netometers, 113. 
Clausius’ theorem for 
cycles, on, 509. 
Coherence, on, 165. 
Conductivity, on chemical dissocia- 
tion and electric, 437. 
Current, on the potential required to 
maintain a, in a gas, 750. 
Currents, on instruments for the 
measurement of alternating, 91; 
on a model illustrating the pro- 
pagation of periodic, in telephone 
cables, 221; on saturation, in ion- 
ization, 650. 
Davison (Dr. C.) on the Caernarvon 
earthquake of 1903, 668. 
Deflexions, on an arrangement tor 
reading off, 111. 
Diffraction-grating, on the diffrac- 
tion images formed by a plane, 
174. 
Duddell (W.) on instruments for the 
measurement of alternating cur- 
rents, 91. 
Earth and ether, on the relative 
motion of the, 716, 753. 
Economy of material in frame- 
structures, on the limits of, 589. 
Elastic limit, on the stretching and 
torsion of lead wire beyond the, 
BOO, 8. 
irreversible 
[IN DEX) 
Electric conductivity, on chemical 
dissociation and, 437; of gases 
contained in small vessels, on the, 
506. 
currents, on instruments for 
the measurement of alternating, 
91; on a model illustrating the 
propagation of periodic, in tele- 
phone cables, 221. 
effects produced by the ex- 
plosion of hydrogen and oxygen, 
on the, 471. 
field, on momentum in the, 
331. 
insulation in vacuum, on, 534. 
—— origin of gravitation and ter- 
restrial magnetism, on the, 685. 
vibrations associated with thin 
terminated conducting rods, on the, 
105, 276. 
waves, on the momentum in, 
305; on the propagation of, 
through spiral wires, 417. 
Klectricity, on the conduction of, 
through high vacua under the 
influence of radioactive substances, 
157; on the discharge of, from a 
Nernst filament, 230. 
Electrode fall in gases, on the re- 
lation of, to the contact potential 
series, 387. 
Elsden (J. V.) on the Llyn-Padarn 
dykes, 664, 
Entropy, on the theory of, 438, 509. 
Kve (A.38.) on the ionization pro- 
duced in gases by Réntgen and 
radium rays, 610; on the secon- 
dary radiation caused by the 8 
and y rays of radium, 669. 
Everett (Prof. J. D.) on normal 
piling as connected with Osborne 
Reynolds’s theory of the universe, 
30. 
Fearnsides (W. G.) on a limestone 
at Barnwell, 664. 
FitzGerald-Lorentz effect, on the, 
753. 
Fleming (Prof. J. A.) on a model 
illustrating the propagation of a 
periodic electric current in a tele- 
phone cable, 221; on the pro- 
pagation of electric waves along 
spiral wires and on an appliance 
for measuring the length of waves 
in wireless telegraphy, 417. 
Frame-structures, on the limits of 
economy of material in, 589. 
