521 
INDEX to VOL. XIX. 
AcTINOMETER, on a new, 231. 
AXther, on the structure of mecha- 
nical models illustrating some pro- 
perties of the, 438. 
Ahrens (C. D.) on a new form of 
polarizing prism, 69. 
Alkalis and alkaline earths, on the 
spectra of the, 365. 
Amagat (E. H.) on the value of 
Poisson’s coeflicient for caoutchouc, 
66; on some results for use in 
calculations with manometers with 
compressed air, 150; on the limit 
of the density and on the atomic 
yolume of gases, 313; on an in- 
strument by which angles with the 
horizon can be measured, 515. 
Amalgams, on the thermoelectric 
properties of, 363. 
Arctic interglacial periods, on, 30. 
Atomic arrangement, on the influence 
of, on the physical properties of 
compounds, 50. 
Atoms, on the size of, 359. 
Ayrton (Prof. W. E.) on gas-engine 
indicator-diagrams, 152; on the 
most economical potential-differ- 
ence to employ with incandescent 
lamps, 304. 
Binocular glasses for eyes of unequal 
focal lengths, on, 461. 
Books, new :—Geology of Wisconsin, 
60; Jukes-Browne’s Handbook of 
Physical Geology, 61; Gray’s Ab- 
solute Measurements in Electricity 
and Magnetism, 141; Day’s Exer- 
cises in Electrical and Magnetic 
Measurement, 142; Lupton’s Nu- 
merical Tables and Constants, 142; 
Pattison Muir's Principles of Che- 
mistry, 222; Pendlebury’s Lenses 
and Systems of Lenses, 888; La- 
timer Clark’s Transit Tabies for 
1885, 389; Wormell’s Electrical 
Units, 389; Williamson and Tar- 
leton’s Treatise on Dynamics, 510; 
Paice’s.Energy and Motion, 511. 
Bosanquet (R. H. M.) on permanent 
magnets, 57; on the magnetic 
permeability of iron and steel, with 
a new theory of magnetism, 73, 
333. 
Braun (F.) on the thermoelectricity 
of molten metals, 495. 
Brown (J.) on the formation of a 
stalactite by vapour, 395. 
Cailletet (M.) on the employment of 
marsh-gas for producing low tem- 
peratures, 65. 
Callaway (Dr. C.) on the granitic and 
schistose rocks of Donegal, 390. 
Caoutchouc, on the value of Poisson’s 
coefficient for, 66. 
Capillary multiplier, on a, 43. 
Chase (Dr. P. E.) on elementary 
phyllotaxy, 68; on some principles 
and results of harmonic motion, 
190; on the thermo-electro-photo- 
baric unit, 517; on the Chase- 
Maxwell ratio, 519. 
Chemical affinity, on the determina- 
tion of, in terms of electromotive 
force, 1, 102, 197. 
Cleminshaw (E.) on spectrum ana- 
lysis, 365. 
Climate, on the characteristics of in- 
terglacial, 36. 
Cole (G. A.J.) on hollow spherulites, 
391. 
Collins (J. H.) on the geology of the 
Rio Tinto mines, 227. 
Colouring matters, on combinations 
of, with silver salts, 229. 
Compounds, on the influence of 
atomic arrangement on the phy- 
sical properties of, 55. 
Croll (Dr. J.) on Arctic interglacial 
periods, 30. 
Dielectric constant of some gases, on 
the determination of the, 393. 
