"Studies of the movement in flowing water of sand grains and larger particles indicate that they can be rolled or slid over surfaces of particles smaller than themselves but that saltation is the dominant mode of progression if particles are moved over a surface of others their own size or larger. This conclusion can be combined with the results of part I of this paper and other information to provide a qualitative explanation of the formative processes of common sandy and pebbly deposits. Saltatory particles build populations A and B; rolling and sliding particles halt to form population C."