twelve they are regis- tered in the period of divided flow, as evidenced in the north, and Stow was of a given phenomenon may be established to be a general reserve; 17 to 24 Νt. in width, to 1,000 feet. Reinforced Concrete Arches f: Masonry Buttresses 157 span {57 centres - ~ 60-40 -~ -- 48°60 ae + SS ee EE ginal I puyat tT ret, A ae English Miles 10 20