Excerpt from Elementary Chemistry of Agriculture
Natural Science is the study of natural objects, and embraces in its widest sense everything which has material existence. Those branches of it treating of animals and plants are known respectively as zoology and botany, or col... lectively as biology. Geology treats of the structure and history of the earth; while chemistry is the science which deals with the composition of substances and the changes they undergo.
Elements and Compounds. All substances are either simple, that is, elementary, or compound. Of simple substances between eighty and ninety are known. They are called elements or elementary matter, and so far as can be ascertained, they cannot be Split up into simpler substances. When two or more elements combine, compounds are produced. The smallest particle of an element which can enter into,' or be driven out of a compound, is known as an atom. While the atoms of the same element are of the same weight, the atoms of different elements vary In weight.
The first letter, or two letters, of the names of an element are used in chemistry to indicate the element, and an atomof that element.
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