Marine Engines and Boilers. By G. C. V. Holmes. With
G9 Wood- cuts. "South Kensington Museum Science Handbook." (Chapman and Hall.)—Mr. Holmes has aimed at supplying a continuous record of marine engines and boilers, from Miller, Symington, and
Fulton, down to the era of triple-expansion engines introduced by Kirk. The illustrations connect the models in the South Kensington Museum with this record, which, we suppose, is really meant to be subordinate to the models. Certainly it is a fairly complete record of itself, and though not, of course, con- cerned in details, gives a continuous history of the successive steps which connect Symington's machine with the ocean-steamer of to-day with her triple-expansion engines.