1890-91.] Drs Symington & Thomson on Defective Ossification. 287 
INDEX REFERENCE TO LITERATURE. 
Yirchow, Gesammelte Abhandlungen , Frankfort, 1856, p. 976. 
,, Entwickelung des Schadelgrundes, Berlin, 1857. 
Muller, Wiirzburger med. Zeitsdhrift , i., 1860. 
Urtel, Foetale Rachitis, In. Diss., Halle, 1878. 
Eberth, Die foetale Rachitis u. ihre Beziehungen zu d. Kretinismus, 
Leipzig, 1878. 
Parrot, Bulletins de la SocUte d' Anthropologic de Paris, 1878, p. 296. 
Bode, Virchow's Archiv., Bd. 93. 
Ziegler, Pathol. Anat., II. Theil, 1885, p. 1033. 
Klebs, AllgemeinePathologie, II. Theil, 1887. 
, , Beobachtungen u. Versuche uber Kretinismus Arch. f. exp. Path. u. 
Pharm., Leipzig, 1874, ii. 
,, Jahrbuch der Kinderheilkunde , 1880. 
W. Adams, Trans. Path. Soc. Lond., xxiv. p. 263. 
T. Barlow, ,, ,, xxvii. 1881. 
,, ,, ,, xxxii. 1884. 
Shattock, ,, ,, xxxii. p. 369, 1884. 
J. W. Ballantyne, Edin. Medical Journal, June 1890, “Intrauterine 
Rickets.” 
EXPLANATION OF PLATES. 
Plate I. 
Reproduction from a photograph of the foetus as seen from behind. 
Plate II. 
Fig. 1. v.m. section of base of skull and adjacent brain of a normal nine 
months’ foetus — natural size; B.O., basi-occipital ; B.S., basi-sphenoid ; p.s., 
pre-sphenoid ; s.o., supra-occipital ; c.g., crista galli ; m., medulla oblongata ; 
p. pons varolli ; c.g., corpora quadrigemina ; c.c., corpus callosum; O.N., 
optic nerve; c., mesial lobe of cerebellum ; c\, lateral lobe of cerebellum; 
F.C., falx cerebelli ; T.U., torcular Herophili. 
Fig. 2. v.m. section of corresponding region of specimen; O.T., os tri- 
basilare, representing the three nuclei, B.O., B.S., and P.S., seen in fig. 1. 
Other lettering as in fig. 1. 
Plate III. 
Longitudinal section of right fibula x 6. A. A., cartilaginous extremities 
traversed by vascular canals ; B., periosteal bone constituting the greater part 
of the diaphysis ; C.C.C.C., peripheral prolongation of periosteal bone em- 
bracing cartilaginous extremity ; D.D., wedge-shaped masses of endochondral 
bone. 
