Frictional Electricity

THIS is a little book written for first beginners in the study of electricity. On the whole it is satisfactory; although the writer betrays curious want of knowledge or want of judgment here and there. The diagrams are good, and the descriptions fairly clear; and from place to place instructions are given to teachers as to experiments they may make before elementary classes for the purpose of illustrating and bringing home to the learners the vario.us parts of the subject. The construction of simple pieces of apparatus, such as a boy may make for himself, is also described throughout the book and in a number of paragraphs at the end. Fractional Electricity. By Thomas P. Treglohan. (London: Longmans, Green, and Co., 1886.)