Miscellanea 
539 
The head was simmered for five hours and the flesh removed with forceps. Partially cleaned 
in alcohol and chloroform — equal parts. 
Skeleton. The incision in the palate has severed the left palatal and pterygoid bones close 
to their articulation with the vomer and rostrum. The right nostril measures 0'7 cm. long by 
1 cm. high, the left 2 by 07 cm. The right frontal anterior to the posterior limit of the orbit is 
3 cms. long and from a breadth posteriorly of 1 cm. tapers gradually ; its anterior extremity 
appears to be of denser structure than that of the left frontal, and is devoid of a process mesial 
to the nasal bone. The left frontal is 2 cms. long and maintains a breadth of about 1 cm. 
This asymmetry throws the anterior part of the skull a little to the left. The superior 
surface of the right nasal bone measures 2 - 3 by 05 cms., the left 2'6 by 0'7 cms. ; the lateral 
process of the right nasal does not share in the hypoplasia. The left nasal bone is thin and 
translucent, the right is thick and opaque. The right jugular and quadrato-jugular measure 
4 cms. as against 4-2 cms. on the left. The light superior maxilla appears to be smaller than 
the left. The shortening of these bones on the right side bends the fore part of the face and 
beak sharply to the right. The other bones are symmetrical. 
The narrow right frontal may be the result of hypoplasia of the right olfactory bulb, in 
consequence of which the soft and bony parts of the right nose may have failed to develop. 
This theory, however, does not give a satisfactory explanation of the elongation of the right 
frontal, the absence of its process mesial to the nasal bone, and the sclerosis of the right 
nasal bone. A more satisfactory explanation of the deformity is that it is the result of a 
hypoplasia of the right nasal bone, the elongation of the right frontal illustrating the inter- 
dependence of growing structures. The sclerosis of the right nasal bone, and apparently also 
of the external frontal process with which it articulates, suggest that the arrest in development 
has been caused by inflammation or trauma. The absence of the mesial process of the frontal 
may be due to involvement of the tissue in which it is formed, in such inflammation or trauma. 
V. Note on a Ready Reckoner for the Obstetrician. 
EDITORIAL. 
On p. 503 of this volume of Biometrika two formulae are given by Dr de Souza, namely : 
(c') for determining the most probable value of the obstetric conjugate in terms of the known 
values of the diagonal conjugate and of the antei'o-posterior diameter, and further ({') giving the 
most probable value of the obstetric conjugate as deduced from the known values of the diagonal 
conjugate and of the height of the right hip-bone. It was proposed to include in Dr de Souza's 
paper two abacs or ready reckoners for the use of the obstetrician, so that after measuring on 
the living subject the diagonal conjugate and either the antero-posterior diameter or the height 
of the right hip-bone, he could read oft' from them the probable value of the obstetric conjugate 
without any calculation. These abacs were prepared by Miss II Gertrude Jones, but owing 
to certain difficulties of engraving, it was not found possible to delay the printing off of 
Dr de Souza's paper till they were completed. The, two abacs have only reached us, in but 
moderately successful reproduction just as we go to press, and are included in this final note. 
The method of using them is extremely simple. For example, in the case of Abac I, 
Plate XXXII, suppose the observed antero-posterior diameter to be 11 -7 cms. and the diagonal 
conjugate to be 13"4cms. we move upwards between the vertical lines at 11-6 and 11-8 on the 
antero-posterior diameter scale, until we meet the horizontal line at ] 3'4 cm. on the diagonal 
conjugate scale ; we then pass oft' on the nearest sloping line to the scale of the obstetric 
