Chemistry / by George Wilson.

  • George Wilson
Date:
1857
Catalogue details

Licence: Public Domain Mark

Credit: Chemistry / by George Wilson. Source: Wellcome Collection.

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    and in a regularly-equipped analytical laboratory. Those who have proceeded that length, however, will be past the guidance of elementary works, and must have recourse to more elaborate treatises for instruction. Let it be observed, nevertheless, that the extent to which Organic Chemistry is discussed in this volume, is such as to include a fair representation of its general character, as well as the discussion of a considerable number of the more curious chemical compounds directly or indirectly derived from plants and animals. Professional students, indeed, must prose- cute Organic Chemistry more fully than it is discussed in the following pages ; but for obvious reasons, that large section of it which refers to medical science is omitted from a work intended as a text-book for young persons of both sexes. Otherwise, as much Organic Chemistry as most beginners can be expected to follow with interest is given ; and to have treated it more fully, would have necessitated great enlargement of the volume, and consequent increase in price, which would have defeated one chief object of its issue. A special treatise on Organic Chemistry is requisite for those who wish to prosecute, even to a limited extent, its important but difficult and intricate details. In using this work, the teacher or pupil is recommended to read the first twenty-eight pages with some care before proceed- ing further. The beginner must not expect to understand tho introductory portions at once, but must go back from time to time to their study, when he will find them become more and more intelligible as he grows familiar with the properties of chemical substances explained in the later pages. On the other hand, some acquaintance with tho contents of the preliminary chapters is essential to an intelligent study of the chemical elements, so that the earlier and the later chapters or sections must be studied alternately or together. The laws of Combining Proportion, and all that follows to the end of page 90, should be left unconsidered till the properties of oxygen, hydrogen, nitrogen, and their compounds, as detailed from page 91 to 126, have been studied, after which the laws of Combining Proportion and the Atomic Theory should be thoroughly learned. A knowledge of Chemical Nomenclature and Notation cannot well be acquired too early; but it will depend greatly on the age, number, and capacity of the pupils, at what stage in their pro- gress these subjects can best be introduced. This general direc- tion, however, may be given:—A portion of each lesson should be devoted to the study of the properties of the various elements and their compounds, with as full experimental illustration as circumstances permit, whilst another part of the lesson is devoted
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