VIIl] 



THE SEGMENTATION OF A DISC 



373 



in this case be precisely accurate, for the simple reason that 

 Berthold's figures are taken from different individuals, and aie 

 therefore only approximately consecutive and not strictly con- 

 tinuous. The last of the six drawings in Fig. 144 is already too 



bod 

 Fig. 155. Theoretical arrangement of successive partitions in a discoid 

 cell; for comparison with Fig. 144. 



complicated for diagrammatisation, that is to say it is too com- 

 plicated for us to decipher with certainty the precise order of 

 appearance of the numerous partitions which it contains. But 

 in Fig. 156 I shew one more diagrammatic figure, of a disc which 



3 1 



Fig. 156. Theoretical division of a discoid cell into sixty-four chambers: no 

 allowance being made for the mutual tractions of the ceU-walfe. 



has divided, according to the theoretical plan, into about sixty- 

 four cells ; and making due allowance for the successive changes 

 which the mutual tensions and tractions of the partitions must 



