. The fossil antecedents of man, and where to discover them. linksto an almost unlimited extent, when the types of an ape and ahuman skull are found to resemble each other. Plates are here given, illustrating the method and its agreement between the orang and Andamanese skulls,1 incomparative smoothness of forehead and great breadth in theoccipital region, has seemed to warrant my use of the orangskull as a basis from which to deduce ancestral forms of theAndamanese skull. By this I do not wish to be understood ascontending that the ancestors of the Andamanese were orangs,but merel
. The fossil antecedents of man, and where to discover them. linksto an almost unlimited extent, when the types of an ape and ahuman skull are found to resemble each other. Plates are here given, illustrating the method and its agreement between the orang and Andamanese skulls,1 incomparative smoothness of forehead and great breadth in theoccipital region, has seemed to warrant my use of the orangskull as a basis from which to deduce ancestral forms of theAndamanese skull. By this I do not wish to be understood ascontending that the ancestors of the Andamanese were orangs,but merely to suggest that their skulls may have been orang-likein the characteristics above named. 1 The drawing of the Andamanese skull is copied from a plate in the Journalof the Anthropological Institute for November, 1879, in connection withProfessor Flowers paper on The Osteology and Affinities of the Natives ofthe Andaman Islands. The drawing of the orangs skull is taken from anactual specimen. STABES OF EVOLUTION OF THE iSDAMAKESE SKULL FROM THE ORANG Bed active Gra nioloyy. 15 The divisions made between the contour of the orang andthat of the Andamanese skull, it will be seen, are in a decreasingratio from left to right. But as equal cranial expansions wouldhave increased superficial areas they would have diminishedthicknesses, otherwise the cubic contents of such expansionswould be unequal. The cranial divisions here given in adiminishing ratio may thus be taken to express equal cranialenlargements. The same reasoning would apply to the jaws, and consequentlyequal degrees of jaw-diminution might have been expressed bya series of divisions diminishing from right to left. An equaldivision from A to A would express an increase in the rate ofjaw-diminution. In the diagram the divisions decrease fromleft to right, and therefore the rate of jaw-diminution heregiven is a diminishing rate. Taking the middle three of the links, namely, Nos. 4, 5, and 6,the crania of which are se
Size: 1278px × 1956px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade188, bookpublisherlondon, bookyear1883
