The whole of the book has again been rewritten and revised, and, with a large number of new illustrations, forms a complete text-book on the construction and working of marine engines and boilers. The number of chapters has been increased from twenty-five to thirty-five, and the various chapters grouped into ten sections. The introductory section is developed so as to cover the syllabus used in the naval training establishments. Very little space is devoted to obsolescent types of boilers and machinery; the thermo-dynamics of the working substance is more fully developed so as to cover the ordinary requirements of the sea-going engineer; the auxiliary section includes new matter on steering and capstan gear, air compressors, hydraulic machinery, refrigerators, electrical and other machinery, as well as a chapter on water-tight, pumping, and fire systems; care and management comes in for a larger share of attention due to recent progress, and also includes a chapter on the duties of the Engineer of the Watch. In the last section, chapters are devoted to the marine steam turbine and to the internal combustion engine.<br><br>Every effort has been made to explain matters in as simple a manner as possible, but it should always be remembered that the practical application of mathematics is essential to the design and economical working of marine machinery.