From the PREFACE. WE hope that this little book will be useful in more ways than one. It contains a series of samples for experiment, and another for observation, -each of which by itself should be of educational value. The experiments are simple, consisting for the most part of the application of chemical tests, the results of which must be carefully noted, and the comparing of weights of certain substances, generally called "taking their specific gravity." The observations bring in the use of the microscope; these will ...
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From the PREFACE. WE hope that this little book will be useful in more ways than one. It contains a series of samples for experiment, and another for observation, -each of which by itself should be of educational value. The experiments are simple, consisting for the most part of the application of chemical tests, the results of which must be carefully noted, and the comparing of weights of certain substances, generally called "taking their specific gravity." The observations bring in the use of the microscope; these will be better performed by a more elaborate than by a cheaper microscope. It is not, however, the privilege of everybody to have the use of an instrument of very high power. Each must, therefore, do his best with the instrument at his command. The time may come when we shall have the use of a high class instrument at Technical Institutes or even at free libraries, where under proper supervision we shall be allowed to examine any specimens about which we may require information, and which we may ourselves supply. A simple microscope can be bought for a few shillings, while an elaborate instrument costs several pounds. Very much, however, of this book can be done without the microscope, although much better with it. To carry out the experiments no expensive apparatus is required. In Appendix No.2 will be found the approximate prices of the items mentioned in the book. The whole forms a course of technical training. In the second place, the exercises are confined to substances used in food, about which we certainly ought to have some information, for on the purity of food good health greatly depends. Without good food no family can enjoy sound health, and no food can be classed as good if it be adulterated. From returns that we have carefully examined, we are glad to find that adulteration is decidedly on the decrease; but when cases turn up of such extensive character as we frequently see reported in our daily papers, we are forcibly reminded that we are at any time liable to fall victims to this fraud....
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