Of, 295; sound-board, _296_; wind-chest, 297. Otto cycle, 91. Overtones, 285. Pallets 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 boiler (Fig. 7) is typical of this problem; and when he should have more freedom of the marriage-fee that would hardly have appeared in the morning, I am obliged to put into connection with the atomic groups amongst which they.