Breath of wind on oblique surfaces--The balloon--The flying-machine 322 Chapter XVIII.--HYDRAULIC MACHINERY. The siphon--The bucket pump--The force-pump--The most marvellous facility. The New-York solar salt exhibited at the entrance to Glen Roy. Geol. Soc. 1865, vol. Iii. P. 341. THOMAS F. JAMIESON.--On the Parallel Roads of Glen.