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The need for a set of up-to-date English physical and chemical tables of convenient size and moderate price has repeatedly impressed us during our teaching and laboratory experience. We have accordingly attempted in this volume to collect the more reliable and recent determinations of some of the important physical and chemical constants. To increase the utility of the book, we have inserted, in the case of many of the sections, a brief résumé containing references to such books and original papers as may profitably be consulted. Every effort has been made to keep the material up to date; in many cases a full reference to the original paper is given, while, failing such reference, the year of publication is almost always indicated. The scope of the volume calls for little comment on our part. We have dipped a little into Astronomy, Engineering, and Geology in so far as they border on Physics and Chemistry. It will be noticed that considerable space has been allotted to Radioactivity and Gaseous Ionization: it is hoped that the collection of data, which we believe to be the first of the kind, will be of assistance to the numerous workers in a field whose phenomenal and somewhat transitional growth is a little dismaying from our present point of view.

Attention has been paid to the setting and accuracy of the mathe-matical tables; these are included merely to facilitate calculations arising out of the use of the book, and limitations of space have cut out all but a few of the more essential functions. The convenience of the student of the newer physics has been studied by the inclusion of a table of values of e-* reduced from Newman's original results. It is …