reduce their number to a list of reasonable length. But this is less necessary, as I have acknowledged throughout the text every extract and every illustration used in this work, whether copied by photography or redrawn in a size to suit my pages. On this score I must, however, make one or two exceptions which only illustrate the invariable courtesy and generosity with which my applications were received. Foreseeing that I would have to make an unusual demand on the special mono- graphs of Cartailhac and Breuil on the more recently dis- covered wall-paintings in the caves of Altamira, Niaux, etc., I wrote to these gentlemen, as well as to the editor of L'Anthropologie, explaining the character of the work I was engaged in, and asking permission to copy some of their illustrations. Not only was my request courteously granted, but M. Cartailhac offered to send me the original plates. Dr Henri Martin made a similar proposal with regard to the La Quina human skeleton. I have not, however, availed myself of such kindnesses, as the illustrations were not often suitable for the size of my pages. Moreover, when I was delivering the lectures, I received from M. Cartailhac a large assortment of coloured drawings of the animals depicted on the walls of Altamira, just in time to be exhibited to an astonished audience.
Among current publications which have furnished me with much valuable materials, as will be seen from the frequent references made to them in the text, I have specially to mention the following:—
Bulletins de la Société d Anthropologie de Paris.
Revue Mensuelle de l'Ecole d'Anthropologie de Paris.
Bullettino di Paletnologia Italiana.
Congrès International d'Anthropologie et d'Archéologie Préhistoriques.
I am indebted to the Councils of the following Societies for a number of clichés, viz.: Geological Society of London
