ANIMAL MECHANICS. 227 

 Mean Curvature of Abdomen in Parturient Women. 



No. 



Longitudinal 

 Diameter = 2p 1 



Transverse Dia- 

 meter = 2p a 



Mean Curva- 

 ture = — i — 



Pi Pu 



i. 



22.03 in. 



12.51 in. 



_ l 



2. 



19-50 >, 



9-93 „ 



¥.'2 8 9 



3- 



25-5 * 0 



14.10 „ 



1 



4 6 40 



4 



34.6o „ 



*4-7* » 



5.f6 1 



5- 



20.01 „ 



12.63 „ j 



1 



This mean curvature differs little from the mean curvature 

 of the voluntarily distended abdomen of young men — viz. : 



— — given in p. 162. 

 4.0596 ' & r 



We can calculate, from the vertical and transverse ten- 

 sions of the abdominal muscles at the navel, given in p 223-4, 

 and from the curvatures just given, the perpendicular pres- 

 sure per square inch, caused by the action of those mus- 

 cles, in each of the preceding cases. For, by equation (36), 

 we have 



P 



which becomes, on adding 50 per cent, to the measurement 

 of the dead muscles, 



p _ 4 * Q-9 45 



for the longitudinal strains ; and 



p B 4 x Q-5 53 



2p 2 



