Excerpt from A Manual of Practical Physical Chemistry

I have had occasion to devise a series of such time-limit exercises, and the present book has grown round instruction sheets written by me in connection with laboratory work here. This manual contains a series of 39 time-limit exercises, which are numbered to facilitate organisation. I have also written introductions to some sections of the subject, and in these parts of the book and elsewhere will be found several important experiments which are not numbered and which will form suitable exercises when unlimited time is available. Thus an endeavour has been made to meet the needs of all classes of students.

In the selection of the experiments, there has been constantly kept in view their value as illustrating theory and their import ance on account of applications to other sections of chemistry and 'to other sciences. Even with the restriction as regards time it may be claimed for the exercises that they are highly instructive and cover a wide field of the subject.

With regard to the time-limit exercises, it should be noted that in some cases the apparatus must be fitted up by the demonstrator beforehand, or kept fitted up throughout the course. It would be impossible otherwise to organise an evening course, for example.

In this work I have paid special attention to the subject Of accuracy, which is discussed in the introduction. The treatment of thls subject in books on Physics and Physical Chemistry, both theoretical and practical, is inadequate and in most cases unsound. Considerable confusion has arisen, for example, in connection with the term probable error and in the use of the sign j: in the theory of errors.

Several parts of this book, both in the text and in the diagrams, are not to be found in any text-book on Physical Chemistry. All the diagrams have been specially drawn for this work. The methods described are up-to-date. The text is made as concise as possible, consistent with clearness 5 a full discussion of theory is, of course, precluded in a book of this scope.

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