Articles liés à Knowledge for the People: Or, the Plain Why and Because...
Présentation de l'éditeur
Dr. Johnson (from A rfouthnot) defines chemistry as philosophy by fire. Mr. Brande says It is the object of chemistry to investigate all changes in the constitution of matter, whether effected by heat, mixtm or other means. Manual, 3rd edit 1830. Dr. Ure says Chemistry maybe defined the science which investigates the composition of material substances, and the permanent chants of constimtion which their mutual actions produce. Dic Uonar Vfedit. 1830. Sir Humphry Davy, in his posthumous work, says, There is nothmg more difficult than a good definition of chemistry; for it is scarcely possible to express, in a few words, the abstracted view of an infinite variety of cts. Dr. Black has defined chemistry to be that science which treats of the changes produced in bodies by motions of their ultimate particles or atoms: but this definition is hypothetical; for the ultimate particles or atoms are mere creations of the imagination. I will ve you a definition which will have me merit of novelty, and which is probably general in its application. Chemigtry rdates to those opera Hona bjf which the intimaie nature qfhod Ua is changed, or by which I key a4iqt vre new properties. This definition will not only apply to the effects of mixture, but to the phenomena of electricity, and, in short, to all the changes which do not merely depend upon, the motion or division of masses of matter.
(Typographical errors above are due to OCR software and don't occur in the book.)
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Présentation de l'éditeur
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