540 
Miscellanea 
conjugate: the required sloping line lies between the 11*4 and ll'S obstetric conjugate lines 
or the probable value of the obstetric conjugate is 11 '45 cms. The actual value found from 
Dr de Souza's formula (c) is 1T43 cms. If the vertical antero-posterior diameter line and the 
horizontal diagonal conjugate line intersect in any case below £>1J, there "is possibility of difficulty 
in labour. 
Again, if the diagonal conjugate be 13'4 and the height of the right hip-bone 20 - 7 cms., we 
enter by the vertical line at 207 on the right hip-bone scale of Abac II, Plate XXXIII, and 
the horizontal line on the diagonal conjugate scale at 13'4 and find that they meet on the 
sloping obstetric conjugate line of 11 '45 cms. The actual value- as found from formula (i') 
is 11 '44. The line of possible difficulty in labour is indicated by 1)1). The use of a lens 
may occasionally be of assistance, but most obstetricians will find themselves able to read 
the value of the probable obstetric conjugate to at least a millimetre and with a probable 
error of 3 mm., this is. ample. Descriptions of the methods of measuring the required lengths 
on the living will be found in Dr de Souza's paper. 
ADDENDUM. Deformity known as Split-Foot, Biometrika, Vol. ix. p. 385. 
Annie Eliza S. (Mrs F.) IV. 9, has given birth a few days ago to a female child, quite normal 
in every respect, October 22, 1913. 
CAMBRIDGE : PRINTED BY JOHN CLAY, M.A. AT THE UNIVERSITY PEESS 
