The chemical pocket-book, or Memoranda chemica : arranged in a compendium of chemistry : with tables of attractions, &c. Calculated as well for the occasional reference of the professional student, as to supply others with a general knowledge of chemistry / by James Parkinson ; with the latest discoveries ; from the London second edition of 1801 ; to which is added an appendix, containing the principal objections to the antiphlogistic system of chemistry / by James Woodhouse, M.D. ... ; embellished with copperplates.

  • Parkinson, James, 1755-1824.
Date:
1802
Catalogue details

Licence: Public Domain Mark

Credit: The chemical pocket-book, or Memoranda chemica : arranged in a compendium of chemistry : with tables of attractions, &c. Calculated as well for the occasional reference of the professional student, as to supply others with a general knowledge of chemistry / by James Parkinson ; with the latest discoveries ; from the London second edition of 1801 ; to which is added an appendix, containing the principal objections to the antiphlogistic system of chemistry / by James Woodhouse, M.D. ... ; embellished with copperplates. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    IG a. Magnesia has not been met with native in an uncom- bined ftate. When pure it is very light and white, and requires 7,900 times its weight of water to hold it in folu- tion. Sp. gr. about 2,3. It combines with all the acids, the fulphuric taking it from the nitric or muriatic without forming a precipitate. It is as infufible as lime, and like it is fufed when mixed with the phofpbate, or borate of foda, and without effer- ■vefcence. 3. Alumine, or EARTH OF ALUM, is the true argil- laceous part of common clay. It is never found pure, in a native ftate. When pure it is white, fmooth, and of an unctuous feel, adherent to the tongue, diffufible in water, and not more folublethan magnefia. Sp. gr. 2,00. When heated it diminiihes in bulk, and may be fo hardened by fire as to give fparks with fteel. It combines with moft acids, though with difficulty, uniting beft during precipitation. With the fulphuric it forms alum, but with the nitric and muriatic it chryftallizes difficultly. It is fufible alone, only by the flame of oxygen gas ; but w.th phofpbate or borate of foda, it may be fufed with nearly the fame degree of facility as lime and inagnefia. 4. Silica is the earth which chiefly forms flint, reck cryftal, and many of the gems. It is of a rough and harrti fee], and appears to be foluble in water itfelf. Fifty grains of colourlefs fluid, contained in the cavities in bafalt, have been fi.und to held a grain of iiliceous earth in folution. It is ailed on by no other known acid, but the fluoric, and yet an alkalinefoiution of this earth admits of fuperfaturation with an acid without any precipitation. It is infufible alone, and is but little a&ed on by phofpbate ojfoda, and but little more by borate of foda. Fixed alka- lies are the effectual folvems of this earth, forming with it flats. Effervefcence takes place in this cafe, but not with the borate of foda. The fixed alkalies aft on it even in the moilt way. 5. Baryt, alfo termed from its high fpecific gravity PONDEROUS EARTH, is not found pure; but when it is obtained pure, by the aaion of a ftrong heat on it in combination with nitric acid, it is more cauftic than lime, and abforbs water eagerly, forming a very tenacious ce- ment. When covered with water it is diffolved with a hilling noife, and cryftallizes in tranfparent needles, forming aeompges Jtke beaten plafter. Cold water diffblvesa 35th