SYNOPSIS 485 



PAGE 



VIII. — Unicellular and Diploblastic Animals. 



In plants there is a clear transition from unicellular forms to 

 solid aggregates, but in animals the connection of the 

 gastrula with unicellular forms is uncertain 261 



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C. — Other matters of general importance, such as the composition 

 and properties of protoplasm, cellulose, chlorophyll, starch, &c.: meta- 

 bolism : holozoic, holophytic, and saprophytic nutrition : intra- and 

 extra-cellular digestion : amoeboid, ciliary, and muscular movements : 

 the elementary physiology of muscle and nerve : parasitism and sym- 

 biosis : asexual and sexual generation : and the elements of embryology 

 — are discussed under the various types, and will be most conveniently 

 referred to by consulting the Index. 



