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others, for courtesies extended to him in making personal examination of their processes and methods; and to the last named especially for opportunities afforded, and assistance rendered, in experimental work. He is also indebted to Prof. Edwin J. Houston, of Philadelphia, for the revision of the proof-sheets of the chapter on Dynamo-Electric Machines.

To facilitate reference and investigation, a copious list of patents -American and British-relating to the subject of electro-metallurgy has been carefully compiled and is given in the Appendix. The very full index will also be appreciated by those who may have occasion to consult it.

W. H. W.

PHILADELPHIA, Nov. 5, 1883.

CONTENTS.

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The Grenet Battery; the Marie-Davy Battery; Smee's Battery
Roseleur's Modification of this Battery

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The Léclanché Battery; this Battery less powerful than either the
Bunsen, Archereau, or Grove Battery

Construction of the Léclanché Battery

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M. Gramme's Improvement in the Dynamo-Electric Machine by using
an Iron Ring as a revolving Electro-Magnet; the Gramme Machine;
to start the Machine

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Relative amount of work done by the Battery, and by the Electro-mag-
netic Machines

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