CONTENTS.

Chap. XXX.

Railroads; Formation of Cuttings ; Gradients;Wldthbetween Rails; Foundations for Stone; Blocks andSleepers ; Rails of Iron ; Chairs; Railway Curves ;Turn-tables; Passing from Line to Line; Switches;Crossing-rails; Planes; Engines for double Plants;Self-acting Planes -

Chap. XXXI.

Principles of Proportion ; Architecture; Dorians •,Tetrastyle Porticoes; Bexastyle Porticoes; Octa-

style Temples ; Doric Columns ; Ionic Proportions;Ionian Tribes ; Pantheon at Rome ; Triumphal Arches ; Poliphele’s Proportions; Roman ex-amples; Byzantine, Romanesque, Lomfcardic, Sax-on, Norman, Saracenic, and Pointed Architecture ;Proportion of mass and void in Cathedrals; Tra­ cery and Geometric Forms on Mouldings and Win-dows ; Groined Vaults , their thrust, and relativedimensions of Piers; Sections of Cathedrals, &c.&c..1579

Index . 1637