Little more than thirty years ago, when a writer was invited to contribute an article to an encyclopaedia on the Stone Age in the Philippines, it was possible for the American Museum of Natural History to inform him that, so far as was known, there was no Stone Age in the Philippines. That the position has so greatly altered during the last three decades is largely due to the indefatigable efforts of an American collector and ethnologist, Professor H. Otley Beyer, to whom we chiefly owe such systematic archaeological surveys as have been carried out in the archipelago. Much of his work, however, remains unpublished or is not generally available, so there may be some value in a short summary of what archaeology has revealed of the cultural history of the Philippines during these three decades.