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Elementary Class-Books — continued. from the distinct objects and ideas treated in the natural and experimental ''sciences have been generally substituted. At the end of almost every'' Lesson will be found references to the works in which the student will most profitably continue his reading of the subject treated, so that this little ''volume may serve as a guide to a more extended course of study. The'' thinks “nothing can be better for a school-book,” and the calls it “a manual alike simple, interesting, and scientific.”

A description, in an elementary manner, of the most important of those ''laws which regulate the phenomena of nature. The active agents, heat,'' light, electricity, etc., are regarded as varieties of energy, and the work is so arranged that their relation to one another, looked at in this light, and the paramount importance of the laws of energy, are clearly brought out. The volume contains all the necessary illustrations, and a plate represent&shy;ing ''the Spectra of Sun, Stars, and Nebula, forms a frontispiece. The'' calls this “the beau ideal of a scientific text-book, clear, accurate, and thorough.”

This little book contains a short description of a course of Practical Chemistry, which an experience of many years has proved suitable for ''those commencing the study of the science. It is intended to supplement,'' ''not to supplant, instruction given by the teacher. The subject-matter has'' been very carefully compiled, and many useful cuts are introduced.