IX] AND SPICULAR SKELETONS 487 



seen, that certain of the geometric forms assumed by the symme- 

 trical Radiolarian shells are just such as the "space-lattice" 

 theory would seem to be inappUcable to, but it is in other ways 

 obvious that symmetry of crystallisation, whether liquid or solid, 

 has no close parallel, but only a series of analogies, in the proto- 

 plasmic symmetry of the living cell. 



