The book is not written for the use of candidates pre paring for any special examinations. It is intended to form a part of the course of teaching or study suitable to the chemical student who wishes to equip himself for the various duties which any well-trained chemist may be called upon to perform. But it is safe to predict that it will be found to meet the requirements of candidates for the various University, Professional, and Government examinations which now serve as tests of chemical know ledge.

In wishing the little book the useful and extended career which it appears to me to merit, I am only giving expression to the hopes of many of the author's chemical friends and colleagues.

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