Show ap pp SLATE blate bloks vari vario been brought forward ferard to account for the beautiful of slate and other similar rocks it is now proved to bero babie bable that all such rocks have undergone severe pressure under which the particles pAtt leles leies have enough to arrange themselves with mith their faces parallel and have undergone a diminution of bulk especially under very great pressure as is shown by the distortion of fossils found in such rocks in a corroborative experiment particles I 1 of bf iron ore were kneaded up in clay and then the clay subjected to a sliding pressure had all been rearranged so as to be parallel and the clay had acquired a cl evage |