Abies nigra, source of spruce gum, 252
Abrus precatorius, seeds, constituents, 244
Absinthium, use of, in Greece, 191
Acetal, isobutylic, preparation, 345
Acetone, determination in wood-spirit, 346
Acid, abric, characters, 244

acetic, detection of mineral acid, 380
history, 379

benzoic, commercial quality, 384
preparation, 382

source, determination,380-383
yield, 188

boric, powdering of, 657

uses of, 280, 553, 656

carbolic, compared with thymol, 331

compounds with boron, 350
determination in urine, 352
impurity, metals, 353
manufacture, with carbonic
acid, 351

pure, preparation, 351
red, decoloration, 353
testing of, 573, 647

carbonic, estimation, 284

solubility in waters, 283

cinnamic, as an antiseptic, 385, 386

in benzoic acid, 381
solubility, 386

gallic, solubility in citrate, 398
hydriodic, preserved by sugar, 116
hydrobromic, commercial, variation of,

274

by permangan-
ate, 397

extraction by dialysis, 396

tungstoboric, 300

urie, determination, Pettit, 395

Acids, biliary, Pettenkofer's test modified, 395
vegetable, qualitative tests, 379

Aconitine, properties, variation of, 427, 428
yield by different processes, 427
Aconitum napellus and paniculatum, culti-
vation, constituents, extracts,
210

species, characters of subterrane-
ous part, 211

Actinium, new metal and compounds, 312
Ethalium septicum, constituents, 1411
Ailanthus bark, vermifuge properties, 214
Air-bath, simple, Fleck's, 52

Albumen, reagent, trichloracetic acid, 449
tannate, 398, 451
Albumen-water, use of, 100

Albuminoids, crystalline, in seeds, 449
Alcamines, 399

Alcohol, amylic, color reaction, Jorissen, 350
determination in alcohol,
349