The open-air or nomadic life of all the tribes of western Europe from Pre-Chellean nearly to the close of Acheulean times was very unfavorable to the preservation of human remains. It is possible that the bodies of the dead and of the aged were thrown out to the hyænas which surrounded the stations, as among some of the tribes of Africa to-day, but it is equally possible that they were interred in some manner. Skeletons buried near the surface in the river sands or gravels of the 'terraces' would not have been preserved. We have seen that the preservation of the Heidelberg and Piltdown remains was entirely due to chance, the bones having been washed down and mingled with those of the animals; nor has any evidence been found in the grotto of Krapina of ceremonial burial or of respect for the dead, but on the contrary there is some evidence of cannibalistic customs. Even before the close of early Mousterian times all this was changed. Perhaps the closer association enforced by the more rigorous climate indirectly produced greater respect for the dead and led to the custom of burial or the orderly laying out of the remains of the dead in the floors of the partly protected grottos and caverns, to which custom we owe our present knowledge of the structure of Neanderthal man in Mousterian times. [Illustration: FIG. 105. Front view of the Neanderthaloid skull found at Gibraltar in 1848--the earliest discovery of a member of this race, now regarded as the skull of a woman. Photograph by A. Hrdlička from the original specimen. One-quarter life size.] The first discovery of a Neanderthaloid was made in 1848, eight years before the type of the Neanderthal race came to light. This was the Gibraltar skull(26) found by Lieutenant Flint, near Forbes Quarry, on the north face of the Rock of Gibraltar. It consists of a well-preserved skull, with the parietal bones only missing and the face and base of the cranium remarkably complete. In 1868 it was presented by Busk to the Museum of the Royal College of Surgeons, in London, where it lies to-day. The exact site of the discovery can no longer be positively identified; it was probably found in a still existing cave, and although its archæologic age cannot be determined, yet as its anatomical features are those of the Neanderthal race, and as all the remains of this race which can be dated with certainty are of Mousterian age, it probably belongs to the Mousterian period. Of recent years its great importance in the history of man has been revealed in the studies of Sollas, Keith, and Schwalbe. Thus it has come to be ranked among the Neanderthaloids and is considered of a particularly primitive form, because of the extremely small size of the brain. This feature and the slight development of the supraorbital ridges, so characteristic of the Neanderthaloids, are explained by the theory that the skull belonged to a female.