The very interesting igneous rocks of the Mozambique Company's territory have not had much attention paid to them in the past, though some of them were noticed in the first paper dealing with the Karroo beds near Tete, that by Lapierre. That writer was in advance of some subsequent observers in his recognition of the peculiar character of the Lupata lavas: so far, indeed, have some others been from this that the various geologists working in the Tete district have actually been accustomed to call the Karroo basalts the “Lupata Volcanics”, as is done in the most recent paper referring to that area. The age of the basalts was demonstrated by the writer in some notes contributed to this Magazine in 1922, and to establish this it was necessary to discuss the position of the Lupata lavas. Messrs. Teale and Campbell Smith subsequently published the first reliable petrographical descriptions of some specimens previously collected by the former, and the present paper is intended to supplement by further field and petrographical notes the valuable work of Dr. Teale, who has long since sought pastures new. It may be mentioned that one of the chief features of the area is the way in which the various igneous rocks are sometimes intermixed. This is a leading factor in contributing to the uncertainty which surrounds the dating of some of the intrusives. Thus a large number of intrusions of various kinds traverse the Karroo basalts and these are undoubtedly of two and perhaps of three different periods. Faulting and overlaps also cause further complications, as may be seen in the small sedimentary area near Mutarara, where Tertiary, Cretaceous, and Karroo volcanics occur closely associated.

This paper gives the results of a series of analyses of typical schists occurring in the Eastern Desert of Egypt. So far as we are aware, no study of this group of metamorphic rocks has as yet been undertaken as regards Egypt itself. Yet this method of attack is essential if any knowledge is to be obtained, not only of their structure and composition, but also of their origin. It must not be forgotten that schists occupy vast areas in south-eastern Egypt, and are also present in Sinai; also among them are included varieties derived from igneous and volcanic rocks as well as from ancient sediments.

In my account of the petrology of the Arnage district of Aberdeenshire, there appeared a description, figure, and analysis of a cordierite-spinel-hornfels from Gallowhill Brae, Arnage. This rock is composed almost entirely of cordierite, with only an accessory amount of spinel, biotite, and plagioclase. On the assumption that the analysis represented the composition of the sliced material, it was pointed out that in the cordierite of this rock, iron-oxides must replace much of the alumina and magnesia of normal cordierite.

During the second half of the nineteenth century, when the district was mapped by the Geological Survey, the acid rocks (rhyolites) near Antrim town at Tardree Cottage, Scolboa, and Sandy Braes were regarded as older than both basalt sets, the lower and the upper basalts of Co. Antrim (1).