IV. ARCHITECTURE, ETC.--Artists' Homes, No. 12.--Wm. Emerson's house, Little Sutton, Chiswick.--Full page illustration and large size longitudinal section. 4978 Memorable English Houses. 4 figures.--Newton's house.-- Flaxman's house.--Canning's house.--Johnson's house. 4980 V. GEOGRAPHY.--Herald Island.--On the summit.--A midnight observation.--Plant life on Herald Island.--Inhabitants of the cliffs. 4980 VI. METALLURGY.--The Treatment of Quicksilver Ores in Spain. 4977 VII. AERONAUTICS.--The Balloon in Aeronautics. 4977 VIII. BIOGRAPHY.--Franz Liszt.--Large Portrait. 4981 * * * * * IMPROVED FIFTEEN TON CRANE. [Illustration: Engraving.] [Illustration: Side and Top View Plans. IMPROVED FIFTEEN TON TRAVELING CRANE.] The machine illustrated on first page has been constructed for Port Alfred Harbor, this being one of several harbors now being made by Sir J. Coode in South Africa. The pier for the construction of which the crane will be employed will consist of concrete blocks laid on what is known as the "overend system." The blocks, being brought on trucks direct from the block yard to within the sweep of the machine, are raised by it, swung round, and accurately set, the machine being continually traveled forward as the work advances. The bottom blocks are laid on bags of concrete previously deposited by the crane out of boxes with flap bottoms. The present machine has been specially designed throughout, and represents the most complete development which block-setting plant has yet attained.