102 Proceedings of Boy al Society of Edinburgh. [sess. 
cave of Feldhoven, situated at the entrance to the Neanderthal 
ravine, on the right hank of the Diissel, and since known as 
the ‘ Neanderthal skull,’ presented such remarkable peculiarities 
that, when first exhibited at a scientific meeting at Bonn, 
Fig. 6. — Femur of Pithecanthropus erectus , found in Java (£). 
(After Dr Dubois.) 
doubts were raised by several naturalists as to whether the 
hones were really human. Figs, 7 and 8 represent two views of 
this relic, outlined from figures published by Professor Huxley 
( Collected Essays , vol. vii. p. 180), from which its characteristics, 
especially the low retreating forehead, may he seen at a glance. 
Writing in 1863, Professor Huxley made the following remarks 
