Older methods of mechanical analysis are briefly discussed and contrasted with the newer precision methods. The pipette method is chosen from the latter as one based on sound principles and yet simple in operation. The principles of the method, its range of application, and inherent sources of error are taken up. A standardized routine for the preparation of samples for analysis is described, and a comparison is made of the pipette method with one of the older routine methods. A flow sheet, indicating in graphic form the steps involved in analyzing a sediment, is appended.