Siege of, 265. Pedals of organ, 303. Bioscope, 266. Blades, turbine, _81_, 83. Block system, 201, 212. Blood, arterial, 359; circulation of, _356_, _357_, 360; venous, 359. Blower-plate, 393, _394_. Boat, sails of, 346. Boiler, Babcock and Wilcox; Messrs. Siebe, Gorman, and Co.; Messrs. Marshall and Sons; The Maignen Filter Co.; Messrs. Negretti and Zambra; Messrs. Chubb; The Yale Lock Co.; The Pelton Wheel Co.; Messrs. Broadwood and Co. [Illustration: ON THE BLUE COLOUR OF.