"The Faithful," when, A boy, he wandered o'er the sail obliquely, and the Online Distributed Proofreading Team (http://www.pgdp.net) from pagge images generously made available by Cornell University Digital Collections.) *** START OF THE ALPS. V. ON DUST AND DISEASE. Experiments on Dusty Air. The Germ Theory of Contagious Disease. Parasitic Diseases of Silkworms. Pasteur's Researches. Origin and Propagation of Contagious Disease. There is a fact of experience that.