570 



THE FORMS OF TISSUES 



[CH. 



spherical wall would be of less area than the plane transverse 

 partition after that Hmit (of one-quarter volume) was passed, the 

 cylindrical would still be the better of the two up to a further hmit. 

 It is only when the volume to be partitioned off is no greater than 



A'^ B' ^ 

 Fig: 221. 



C 



about 0-15, or somewhere about one-seventh of the whole, that the 

 spherical cell-wall in a corner of the cubical cell, that is to say the 

 octant of a sphere, is definitely of less area than the quarter-cylinder. 

 In the accompanying diagram (Fig. 221) the relative areas of the 

 three partitions are shewn for all fractions, less than one-half, of 

 the divided cell. 



In this figure, we see that the plane transverse partition, whatever fraction 

 of the cube it cut ofF, is always of the same dimensions, that is to say is 



