Nervous and mental diseases . Fig. 272.—Oxycephalies. Fig. 273.—Plagiocephalus. Trigonocephalus.—Premature union of the frontal suture, resultingin very narrow forehead and great width behind, giving rise to the termtrigonocephalus (Fig. 275). The two systems of measurement—the craniometrical and the ceph-alometrical—differ but slightly from each other, the former, of course,being the more exact, since every portion of the naked skull is attain-able. I would recommend the following series of measurements to be. Fig. 274.—Scaphocephalus. Fig. 275.—Trigonocephalus. taken—eleven in number—in orde
Nervous and mental diseases . Fig. 272.—Oxycephalies. Fig. 273.—Plagiocephalus. Trigonocephalus.—Premature union of the frontal suture, resultingin very narrow forehead and great width behind, giving rise to the termtrigonocephalus (Fig. 275). The two systems of measurement—the craniometrical and the ceph-alometrical—differ but slightly from each other, the former, of course,being the more exact, since every portion of the naked skull is attain-able. I would recommend the following series of measurements to be. Fig. 274.—Scaphocephalus. Fig. 275.—Trigonocephalus. taken—eleven in number—in order to form a just idea of the capacity,shape, and symmetry of any head (Figs. 276 and 277): (1) The circum-ference ; (2) the naso-occipital arc (N to T) ; (3) the nasobregmatic arc(i^to (3) ; (4) the bregmatolambdoid arc (/? to A) ; (5) the binauriculararc ; (6) the anteroposterior diameter (S to 0) ; (7) the greatest trans-verse diameter (length-breadth index); (8) the binauricular diameter;(9) the two auriculobregmatic radii; (10) the facial length; (11) theempirical greatest height (B to /S). In addition to acquiring these mathematical data, cephaloscopic GENERAL ETIOLOGY OF INSANITY. 689 drawings are invaluable as exhibiting deformity clearly to the , the horizontal circumference, naso-occipital curve, and binau-ricular curve should be taken with a strip of lead, or, what is better,with the instrument devised by Luys (on the principle of the hattersconformateurs), and the curves proj
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