The elements of experimental chemistry / by William Henry.

  • Henry, William, 1774-1836.
Date:
1810
Catalogue details

Licence: Public Domain Mark

Credit: The elements of experimental chemistry / by William Henry. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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    laws admits of a more direct application to human affairs. There is another branch of knowledge (that of natural history), which is materially advanced by the application of chemical science. The classi- fications of the naturalist are derived from an ex- amination and comparison of the external forms, both of animate and inanimate bodies. He dis- tributes the whole range of nature into three great and comprehensive kingdoms, — the ani- mal, the vegetable, and tiie mineral. Each of these, again, is subdivided into several less exten- sive classes; and individual objects are referred to their place in the system, by the agreement of their characters, with those assigned to the class, order, and genus. In the different departments of natural history, these resemblances vary in distinctness, in facility of observation, and in cer- tainty of description. Thus, the number and disposition of the parts of fructification in vegeta- bles afford marks of discrimination, which are well defined, and easily ascertained. But mine-: rals, that are not possessed of a regularly crystal- lized form, are distinguished by outward qualities that scarcely admit of being accurately conveyed by language; such as minute shades of colour; or trifling differences of hardness, transparency, &c. To the evidence of these loose and varvintr