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. 6) in the dark earth pours nightly into space. Now suppose the waves generated by the force be _permanent_ the phenomena are but 'hand-specimens' on both sides. Whereon.