The disproportion of growth of the two original segments of the parietal bone will, I believe, be found more common as attention is directed to this subject. It can be well explained, though there may at times be other factors present, by a difference in the blood-supply to the two centres. This of course may occur not only in different skulls, but also on the two sides of the same cranium. Footnotes: [Footnote 1: Die überzähligen Hautknochen des menschlichen Schädeldachs, Abh. d. k. bayer. Akad. d. Wiss., II Cl., XX Bd., II Abth., pp. 36 et seq., Fig. 17.] [Footnote 2: _L. c._, p. 41. Among 3000 Bavarian crania, Ranke found but one with complete and three with incomplete parietal sutures; basing his conclusion on this observation, he says, "Bei den Orangutanschädeln ist die Häufigkeit der Scheitelbeinnäthe circa 40 mal grösser als bei dem erwachsenen Menschen."] [Footnote 3: Since finding the abnormal sutures on this skull, I have been able to present the same at a meeting of the Association of American Anatomists (1899) and before the Ethnological Society of New York City (1900).] [Footnote 4: Toldt, C., in Maska's Hdb. d. gerichtl. Med., 1882, v. III, p. 515; the same in his U. d. Entwick. d. Scheitelbeins d. Menschen, Zeitschr. f. Heilkunde, 1883, v. IV, pp. 83-86.] [Footnote 5: _L. c._, pp. 324-330.] [Footnote 6: _L. c._, pp. 327-330, Figs. 29-32.] [Footnote 7: Gruber, W., Beobacht. a. d. menschl. u. vergl. Anat., Berlin, 1879, II Heft, pp. 12-15.] [Footnote 8: Welcker, H., Untersuch. ü. d. Wachsthum u. Bau d. menschl. Schädels, Leipzig, 1862, p. 109.] [Footnote 9: Putnam, F. W., Abnormal Human Skulls from Stone Graves in Tennessee (Proc. A. A. A. S., XXXII, 1884, p. 391).] [Footnote 10: _L. c._, p. 309.] [Footnote 11: Ranke's Fig. 25, p. 318.] [Footnote 12: Virchow's Archiv, 1870, v. 50, p. 113.] [Footnote 13: Hyrtl, J., Die doppelten Schläfenlinien d. Menschenschädel, etc. (Denkschr. d. math. naturw. Classe d. k. Akad. d. Wiss. zu Wien, 1871, v. XXXII, pp. 39-50).] [Footnote 14: Gruber, W., Beobacht. a. d. menschl. u. vergl. Anat., Berlin, 1879, II Heft, p. 15.] [Footnote 15: Dorsey, G. A., Chicago Med. Recorder, v. XII, Feb., 1897.] [Footnote 16: Calori, Luigi, Sut. soprannum. d. Cranio Umano (Mem. d. Accad. d. Sc. d. Ist. d. Bologna, 1867, pp. 327 et seq., Fig. 4).] [Footnote 17: _L. c._, p. 303, Fig. 13.] PUBLICATIONS OF THE American Museum of Natural History The publications of the American Museum of Natural History consist of the 'Bulletin,' in octavo, of which one volume, consisting of about 400 pages, and about 25 plates, with numerous text figures, is published annually; and the 'Memoirs,' in quarto, published in parts at irregular intervals. The matter in the 'Bulletin' consists of about twenty-four articles per volume, which relate about equally to Geology, Palæontology, Mammalogy, Ornithology, Entomology, and (in the recent volumes) Anthropology.