MUSCLE, NERVE AND LOCOMOTION 



65 



10 20 30 40 50 60 70 



Angle between fibre and longitudinal axis, 



(c) 



90 



e 



Fig. 34. The relation between the volume of a cylindrical 

 system bounded by inextensible "fibres of length D and the 

 angle B which the fibres make with longitudinal axis, (a) the 

 course of a single fibre; (b) the cylinder slit lengthwise and 

 opened out ; (c) the relation between angle Q and volume of 

 the system, which is maximal when B = 54" 44' The horizontal 

 line represents the volume of an animal which is less than the 

 maximum permitted by the fibres. The limits of Q are at 

 F and G. From Clark and Cowey, 1958. 



