Iisr another column of this issue of NATURE (see p. 120) reference is made to the reaffirmation by Prof. F. Weidenreich of the Cenozoic Research Laboratory, Peiping, of the orang-like character of the Piltdown jaw, which he relegates to the group orang-chimpanzee-gorilla, standing outside the line of human descent. In this connexion attention may be directed to another attack on the human character of the Piltdown relic by Mr. Alvan T. Marston, which appears in Discovery of January. Here the basis of argument is the character and arrangement of the teeth, in which it is maintained the jaw is anthropoid and not human. The form of the canines, it is said, points to a gap between canines and incisors and an outside bite of the former, such as are found in the apes, but never appear in man, even in such an early and primitive form as Peking man. Similarly, such indications as are afforded by the Piltdown jaw on the order of eruption of the teeth point to the anthropoid, rather than the human, character of the dentition. The canine, instead of preceding the second molar, as in man, was here the last to erupt, and indeed, Mr. Marston infers, was still incompletely formed. Further, he concludes, the jaw shows no evidences of the adaptations for speech, for which capacity is to be inferred from the advanced character of the brain. When Prof. Weidenreich's promised monograph on the teeth of Sinanthropus appears, in view of the relatively large amount of evidence at his disposal, it may be anticipated that we shall learn whether the teeth show the variability, which he has found in the mandible, and whether it supports the evidence already available to Mr. Marston, on which he relies to no little extent in stating his case.