TTIE SHAPES OF YEGETAL CELLS. 



161 



somewhat from tlie two outer halves. So, too, of the type 

 exemplified by Fig. 10, it is to be noted that besides the 

 difference between the transverse and longitudinal dimensions, 

 which the component units display in common, the two end 

 units differ from the rest : they have appendages which the 



'O 'CXD Jsmm 





w^^ 



rest have not. Once more, where the integration is car- 

 ried on in such ways as to produce not strings but clusters, 

 there arise contrasts and correspondences just such as might 

 be looked for. All the four members of the group shown in 

 Fig. 12, are similarly conditioned ; and each of them has 

 a bilateral shape answering to its bilateral relations. In 

 Fig. 14 we have a number of similarly-bilateral individuals 

 on the circumference, including a central individual differing 

 from the rest by having the bilateral character nearly 

 obliterated. And then, in Fig. 15, we have two central 

 components of the group, de^dating more decidedly from 

 those that surround them. 



These few t}'pical facts, which must be taken like the few 

 typical facts grouped in each of the foregoing chapters as 

 indicating a mass of evidence t<")0 great to be here detailed, 

 will sufficiently show that from the most complex vegetal 

 types down to the most simple, the laws of morphological 

 differentiation remain the same. 



