Excerpt from Principles of Chemistry
This book has grown out of the need for a text-book for the course in General Chemistry and Qualitative Analysis in the University of California. There are, it is true, many excellent tests in existence, but whenever an instructor uses a text written by some one else he faces the dilemma that a departure from the order and manner of presentation of the printed text results in the loss of much of its value to the student, whereas a close adherence to it, on the other hand, interferes with the freedom and individuality, and hence with the enthusiasm and effectiveness of the teacher. Nor can the instructor altogether avoid this dilemma by writing his own book, as probably every one is tempted to do, for the use of any text tends to end the period of experimentation upon the class, and to substitute, therefor, year after year of complacent stereotyped repetition.
Now there are two facts which seem to the writer to indicate a way to avoid these difficulties. The first is that the difficulties of the student are not concerned with the simple matters of fact so much as with general principles, methods and points of view. It is comparatively easy for him to learn the properties and uses of substances from any text-book, lecture or laboratory course, but much harder for him to learn to write equations, to use them in calculations of weight and volume, to understand and apply such principles as the Ionic Theory or the mass law. Repetition thought and practice are required in such cases.
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This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works. Это и многое другое вы найдете в книге Principles of Chemistry (Classic Reprint) (Joel Henry Hildebrand)