Ty-isaf long cairn is one of a group of 13 long cairns in the Black Mountains of Brecknockshire. The existence of the group was first recognised by Mr O. G. S. Crawford, who published them in his Long Barrows of the Cotswolds. Several—in particular Ty Illtyd, Gwernvale and the two fine examples at Fostill near Llanelieu—were already well-known; but Ty-isaf, with a number of others, was first launched on an archaeological career by Mr Crawford in 1925.Crawford's preoccupation being with the Cotswold long cairns he did not attempt to consider every aspect of the Brecknockshire cairns. This I subsequently tried to do in Archaeologia Cambrensis for 1936. But it had long been clear that the complete excavation of at least one of the monuments was badly needed to augment what we already knew— which was little enough—from chance digging and from visible features.The Brecknockshire Society therefore deserves the thanks of archaeologists in general for undertaking this excavation, and congratulations for the success which has attended their efforts. Gratitude is especially due to the Society's President Sir John Lloyd, by whom with Mr R. G. Sandeman most of the preliminary arrangements were carried out. Other members of the Society helped in various ways. Mr Sandeman himself was present throughout the whole course of the work, and Mr Jestyn Williams was responsible for some of the surveying upon which the plan (fig. 2) is based.

The chronology of the flint dagger which is the subject of the present paper has been discussed by R. A. Smith, who established the date of the type in the first phase of the Bronze Age, the period to which it had already been assigned by Montelius. A summary ot the list made by Mr. Smith is given in Appendix II below (p. 354-5); the few examples recorded with datable associations since 1919 bring the total up to 26.Sir John Evans's description, adopted by Mr. Smith, gives the length and breadth of the type as varying generally between 5 and 7 ins. and 1½ to 2½ ins. respectively, although both larger and smaller examples occur. The blades are thin in proportion to their length, and lanceolate in outline, although in this respect there is a certain amount of variation. Both faces are flaked, and the working is generally of a very high character. In some cases major excrescences have been reduced by grinding.Some typological development may be observed in the forms, although this cannot be compared with the elaborate evolution of the well-known Scandinavian series (below, p. 350). The changes take place in the butt. The earliest form typoiogically speaking, would seem to be a simple leaf-shaped blade, the widest part of which is approximately at the middle. There is no distinction between blade and tang or handle, and the latter is generally rounded off. Such daggers as the Green Low, Alsop Moor (Appendix I, no. 27, and fig. 1), and Acklam Wold (126) examples represent this form. It is not always easy to decide, however, whether other blades approximating to this shape represent a so-called prototype, and care has also to be taken to differentiate surface-found laurel-leaf blades of Solutrean age, although these are more usually pointed at both ends.

It is a commonplace that of all the mobile art-forms of prehistoric times pottery is the least mobile and the most domestic. It would be wrong to assert categorically that never before the Roman period or the years immediately preceding it was pottery the subject of trade and transport; but the traffic was at least on a limited scale. Unlike objects of metal, therefore, which may wander far from their place of origin in the course of trade or other movement, pottery closely reflects in its distribution the relationship between culture and geography.Pot-making, too, is a comparatively lowly, if an expressive, craft. In a wealthy community, or in a community with varying levels of wealth, pottery takes second place to metal or (where it exists) glass: usually, therefore, pottery is the borrower both of form and of ornament. And while with an inventive people the result may in due course be something new and significant in itself, in less fortunate circumstances—as for instance under the mass-production methods of Roman times—the potter's debt becomes a lifeless imitation of, or a negative development from, the forms and motifs of the superior materials.

W. F. Grimes excavated a rectangular earthwork in advance of airport construction in 1944, at Heathrow, Middlesex, and found a timber building of unique ‘concentric-rectangle’ plan, together with penannular house gullies; all these features were thought to be part of the same settlement except for two Neolithic pits. Now it can be seen that a Late Bronze Age occupation attested by scattered pottery and small finds but next to no identifiable structures, was followed by 11 Middle Iron Age round houses, and one or two features that may be Late Iron Age. The rampart of the earthwork overlay at least some of the houses. The rectangular building may be Middle or Late Iron Age: though other Iron Age rectangular buildings are now known, its concentric plan remains unique in Britain and resembles that of some Romano–Celtic temples. The precise chronological relationship of the strong earthwork, the round houses and the rectangular building remains uncertain.

The Vale of Glamorgan (fig. 1, 1) is the middle part of the coastal plain of South Wales. An undulating belt of country much dissected by river systems, its highest parts consisting of knolls and ridges which rarely achieve a height of more than 400 ft. above sea-level, it was occupied fairly intensively throughout prehistoric times. Round barrows are found scattered throughout its length. But they are particularly concentrated in one area in the middle portion of the Vale, where, between the ancient towns of Llantwit Major on the coast, and Cowbridge, about six miles inland, between 20 and 30 have been recognised. None of these barrows has hitherto been scientifically examined, nor do they appear to have suffered damage apart from ploughing. The excavation here described was undertaken by the Archaeological Section of the Cardiff Naturalists' Society in the hope that from it might be derived definite information bearing upon the intensive Bronze Age occupation of this part of the coastal plain which the barrows clearly attest.