The Tiree pink marble, a fine-grained, severely crushed limestone with evidence of earlier coarse crystallization, is exposed in several small areas up to 100 feet across on the farm of Balephetrish near the north coast of the island of Tiree in the Hebrides. It contains a remarkable quantity of dark silicate minerals and has discordant contacts with the adjacent Lewisian gneiss. The precise nature of its relation to the gneiss, and mode of emplacement, have been much discussed. The writer has been permitted to consult accounts of the literature, by Mr. V. A. Eyles, and of the petrography, by Sir Edward B. Bailey, and is also indebted to those authors for discussion of the problems. At the suggestion of Sir Edward Bailey the present work was undertaken as a contribution to the study of this problem from the mineralogical point of view. Most of the determinations were made in 1938, but it was not possible to complete publication at that time.

In X-ray studies of fireclays we have frequently observed the presence of anatase to the extent of 1 or 2% with little or no rutile, and no brookite. Chemical analyses of these clays usually record 1–2% of TiO2 and occasionally more (Ennos and Scott, 1924). The mineralogical form of the TiO2 is usually not stated, but a number of references to the observance of rutile needles give the impression that rutile is the form in which titania occurs in these deposits. Our own observations based on X-ray powder photographs lead us to conclude that anatase is commonly present and that rutile is either absent or present in smaller quantities. We have not detected brookite.

Mineral localities in north-western England were visited during the second excursion organized by the Society in recent years, from April 14 to 18, 1947, the headquarters being the George Hotel, Penrith. Members taking part included: The President, W. Campbell Smith (London), O. J. Adamson (Oslo, Norway), W. Anderson (Newcastle), F. A. Bannister (London), D. W. Bishopp (Dublin), C. E. N. Bromehead (London), G. F. Claringbull (London), T. Deans (London), W. A. Deer (Cambridge), K. C. Dunham (London), N. R. Goodman (Nova Scotia and Oxford), G. S. Gowing (Stockton-on-Tees), S. E. Hollingworth (London), W. Hugill (Stoke-on-Trent), H. Neumann (Oslo and Leeds), C.W. Pegg (London), F. H. Rathmann (U.S.A.), P. L. Rumsby (London), R. D. S. Shrimpton (Slough), J. H. Taylor (London), E. A. Vincent (Durham), L. R. Wager (Durham), Miss D. E. Wisden (Southampton). Dr. Claringbull undertook the administrative arrangements.