Through the kindness of Dr J. Waechter I have been able to study the deposits of Gorham's Cave on the spot, to investigate the evidence for fluctuations of the sea-level afforded by the Rock of Gibraltar and to identify the fauna. The material thus obtained suggests a chronology for the prehistoric industries of Gorham's Cave which is of more than local interest. I wish to express my gratitude to Dr Waechter for allowing me to do this work on his excavation and for his constant and efficient co-operation. This became particularly important during the last season (Spring 1954) when I was unable to re-visit the site, so that he had to make certain observations for me. I also wish to acknowledge the help I received from Dr I. W. Cornwall in the analyses of samples from the strata, and from Mr Antony Sutcliffe with the identification of the osteological material. The latter will be published in full in Dr Waechter's final report but a preliminary list is here included since some of the palaeontological evidence supports the results obtained in the laboratory. A contribution towards the expenses incurred in carrying out the field work was received from the Central Research Fund of London University and is herewith gratefully acknowledged.