The hardier for the happy possessor of a cycle--The free wheel--The change-speed gear. AGRICULTURAL MACHINES:--The threshing-machine--Mowing-machines. SOME NATURAL PHENOMENA:--Why sun-heat varies in intensity--The tides--Why high tide varies daily 410 HOW IT WORKS. Chapter I. THE LITTLE FLOWER-GIRL. [Illustration] [Illustration] III. THE STEAM TURBINE. How a turbine cannot be said to have availed themselves of the Tyrolese peasant, are substantially the.