Welsh Journals

NATURE IN WALES The Journal of the Naturalists' Trusts of West Wales, North Wales and Radnor Editors T. A. WARREN DAVIS L. S. V. VENABLES Managing Editor: DILLWYN MILES, 4 Victoria Place, Haverfordwest, CONTENTS OF VOLUME 13 NUMBER 4, SEPTEMBER 1973 Page ORNITHOLOGICAL CHANGES IN WALES. P. E. Davis and P Hope Jones 219 SOME RECENT RARE AND UNUSUAL MARINE FISH IN NORTH WALES. E. I. S. Rees and D. 7. Grove. 226 SHEEP GRAZING EXPERIMENTS IN SNOWDONIA. J. DALE. 229 METAL LEVELS IN RODENTS FROM SKOMER ISLAND. J. A. Cameron 235 WELSH BIRD REPORT. P. Hope Jones and P. E. Davis. 239 WATER POLLUTION AND ITS CONTROL. W. Roscoe Howells, B.SC., PH.D. 252 A WHALE-LOUSE (Isocymanus Delphini) ON A COMMON PORPOISE (Phocoena phocoena) FROM CARDIGAN BAY. Philip M. Miles 263 FIELD NOTES. 265 BOOK REVIEWS. 269 ADVERTS. 272 The Editors and the Scientific Advisers endeavour to maintain a high standard of accuracy but do not accept responsibility for the statements and opinions of the contributors to this Journal. Issued free to all Members of the above Trusts. On sale, price 55p by post.