The Edinburgh new dispensatory : containing, I. The elements of pharmaceutical chemistry : II. The materia medica ... : III. The pharmaceutical preparations and compositions : including complete and accurate translations of the octavo editionof the London pharmacopoeia, published in 1791 : Dublin pharmacopoeia, published in 1794 : and of the new edition of the Edinburgh pharmacopoeia, published in 1803 : illustrated and explained in the language and according to the priciples of modern chemistry : with many new and useful tables, and seveal copperplates, explaining the new system of chemical characters, and representing the most useful pharmaceutical apparatus / by Andrew Duncan, Jun. M.D.

  • Lewis, William, 1708-1781.
Date:
July 1805
Catalogue details

Licence: Public Domain Mark

Credit: The Edinburgh new dispensatory : containing, I. The elements of pharmaceutical chemistry : II. The materia medica ... : III. The pharmaceutical preparations and compositions : including complete and accurate translations of the octavo editionof the London pharmacopoeia, published in 1791 : Dublin pharmacopoeia, published in 1794 : and of the new edition of the Edinburgh pharmacopoeia, published in 1803 : illustrated and explained in the language and according to the priciples of modern chemistry : with many new and useful tables, and seveal copperplates, explaining the new system of chemical characters, and representing the most useful pharmaceutical apparatus / by Andrew Duncan, Jun. M.D. 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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    105. Ammonia is always claffed with the alkalies, from the analogy of its tafte, caufticity, combinations with the acids, and effecls upon vegetable blues; but as it differs in many particulars, being extremely volatile, and a compound fubftance, readily de- compofed, and formed in many chemical operations, and its com- pofition well known, we have ventured to fcparate it from the alkalies, and refer it to that place, which, in all probability, it will always retain, and to which the other alkalies will, perhaps be referred, when their compofuion (hall be detected. Primary Compounds of the Salifiable Bases. A. With each other ; earthen ware ; glafs. B. Withfulphur; alkaline and earthy fulphurets. Vide Sul- phur. C. With phofphorus; alkaline and earthly phofphurets. Vide Phofphorus. 106. The fubftances of this clafs exert a confiderable action on each otber. Potafs was long believed to be the' only folvent of filica , and it is now further proved, that the whole of this clafs are capable of combining, when prefented to each other in a ftate of foliation ; and on this property, in part, the efiecl: of mortars de- pends. Their aclion on each other, by means of heat, is of much greater importance, as it includes the theories of the manufac- tures of porcelain and glafs. 107. Porcelain, and all kinds of earthen ware, confift of alumina and filica, mixed in different proportions into a plaftic mafs, fabri- cated into various fliapes, dried and expofed to the heat of a fur- nace, where they undergo a kind of femifufion. They are glaz- ed by being thinly covered with a more fufible compofition, and may be afterwards painted with enamels, which are {till more fufible than the glazing. 108. Glafs is compofed by melting about equal parts of potafs or foda with filica. It is harder and more durable in proportion to the excefs of the filica. The tranfparency of glafs depends upon its being cooled quickly ; for if cooled very flowly, it alTumes a radiated cryftaliine appearance, and becomes perfectly opaque. By melting filica with about three times its weight of foda or potafs, a giafs is obtained, which not only is foluble in water, bu: even attracts moiflure from the atmofphere. This folution has long been known by the name of Liquor of Flints. The proper- ty which metallic oxides have of rendering glafles more fufible, and of imparting to them certain colors, has given rile to the arts of imitating precious ftones, and of enamelling*