The book makes no claim to being a practical manual, because thereby intricate technicalities would have been unavoidable. The information respecting the various mechanical aspects of cinematography are set forth in a readable manner, so that the broad principles may be understood. While the most popular features of motion photography are described fully, I have not omitted to introduce the reader to the educational and scientific developments, which are more wonderful and fascinating. Indeed, the cinematograph will probably achieve greater triumphs in these fields than it has accomplished already as a source of amusement.