Breccias and conglomerates have always attracted me, and the former especially since I had opportunities, about ten years ago, of examining one of the most interesting examples in Europe. They afforded problems, to which I failed to find answers in all respects satisfactory; so in the hope of obtaining further information I spent, during the summer of 1900, some days in the Western Thüringerwald, with my friend the Rev. Edwin Hill, in order to study the noted breccias of the Rothliegende, and last July again examined, and more fully than before, the beds of breccia, sections of which are well displayed along the high road in the Val des Ormonts above Le Sepey. In former years I had visited the Permian Breccias of the English Midlands and those now assigned to that period in Devon. All these exhibit certain features in common, some of which are also found in the so-called Dolomitic Conglomerate in the South-west of England. So I purpose to give a brief summary of the principal characters of each of these deposits, concluding with some comparatively modern breccias, in order that, if I cannot completely unravel their history, I may at least bring the more significant facts into a clearer focus.