In drawing up a systematic course of elementary chemical instruction based upon the periodic classification of the elements, whether it be as a course of lectures, or as a text-book, a number of serious difficulties are at once encountered These possibly are sufficient to accoimt for the fact, that although twenty-five years have elapsed since Mendelejeff published this natural system of classification, the method has not been generally adopted, as the basis of English elementary text-books. I have endeavoured to obviate many of these difficulties, while still making the periodic system the foundation upon which this little book is based, by dividing the book into three parts. Part I. contains a brief sketch of the fimdamental principles and theories upon which the science of modem chemistry is built Into this portion of the book I have introduced, necessarily in briefest outlines, some of the more recent developments of the science in a physico-chemical direction, of which it is desirable that the student should gain some knowledge, even early in his career. Part II. consists of the study of the four typical elements, hydrogen, oxygen, nitrogen, and carbon, and of their more important compounds. By dissociating these four elements fix)m their position in the periodic system, and treating them separately, the student is early brought into contact with many of the simpler and more familiar portions of the science.
(Typographical errors above are due to OCR software and don't occur in the book.)

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