Amber, its electric powers, 456

Ammonium bimalate, crystals of, how
modified, 132

Ampère's theory of electro-magnetism,
618

Analysing plate for polarized light, 238
prism, Jellett's, 253

Analysis, chemical, 6

Andrews, experiments on liquefaction of
gases, 415

Angle of incidence for light equal to angle
of reflection, 167

of minimum deviation, 182
Angström, diffraction spectrum, 228
Anhydrides, 8, note

Animal charcoal, decolorizing power of, 80
Anode, zincode, or positive pole, 573
Anorthic system of crystals, 147
Antimony, diamagnetism of, 670

its thermo-electric properties,
656, 659

Apjohn's formula for wet-bulb hygro-