THE country described in the following notes comprises the area lying between latitudes 10° N. and 11° 30′ N. and longitudes 8° 45′ E. and 10° E., and is situated in the northern portion of Bauchi province and the south-eastern portion of Kano province, Northern Nigeria.

THERE has been great controversy as to whether or not there exist in Brazil diamond-bearing “pipes” such as are found in South Africa. That something of the kind should exist seems to be pretty well acknowledged, but any evidence in support of the discovery of a “pipe” has always been very meagre. The following observations made by the writer on a few mines in the neighbourhood of Diamantina, in the state of Minas Geraes, might be of interest on this somewhat vexed question.

THE basement platform of Southern Eyre Peninsula consists of a series of igneous and metamorphic rocks of pre-Cambrianage. Rising from beneath the Mesozoic and Tertiary strata of the Nullarbor plains, they may be regarded as a south-easterly prolongation of the great pre-Cambrian Shield of Western Australia. The platform is for the most part within a few hundred feet of sea-level, and large areas of the region are covered by the products of long-continued weathering of the older rocks or by siliceous deposits of late Tertiary age. The best sections for geological study are those exposed along the coastline, and in the hilly areas of Hutchison and Warrow.

THE speeds of the currents employed in the elutriation process in sorting diversely sized material bear no relation whatever to the speeds of the currents, which are competent to transport the same material. The elutriation process in no way imitates the natural processes whereby sediments are transported, sorted, and deposited. The determination of competent velocities in relation to size of material transported is quite a distinct investigation, and one which still calls for much study in spite of the time and attention given to it by numerous workers.