8 THE EVOLUTION OF CONTINUITY 



Chapter V 



PAQB 



The Filamentous Individual 49 



Cell-continuity in its simplest form — Continuity introduces Arrest 

 — Environment and its wide significance — Always in terms of 

 attraction or repulsion classifiable as suitable or unsuitable — 

 The mutual attraction of cells has had no part in the evolution 

 of cellular continuity — A special factor necessary as a compressing 

 agency — Living Continuity has evolved by leaps and bounds — 

 Temporary and Permanent cell-arrest — The price of Continuity 

 is Cell-arrest — The four all-important laws of Growth — Spirogyra 

 — Theory of the development of its growth-cycle — Cell-intercala- 

 tion — Sexes of filaments — Progressive diminution — .(Edogonium 

 supports Spirogyra theory — Parthenogenesis and Alternation of 

 Generations — Alternation of Cycle-stages. 



Chapter VI 



The Ccenocytic Individual 59 



Lateral Continuity — Ccenocytic Continuity not on main road 

 of Continuity's evolution — Mucor as an example of Ccenocytic 

 Individual — Comparison of mycelial hypha with cell-filament — 

 Mucor mucedo — Mycelial alternation of generations — " Torula " 

 condition in Mucor — False Tissue ; a multiplication of Continuity 

 within the Individual, and connected with reproduction — In 

 Eurotium ; in Agaricus. 



Chapter VII 

 Bacteria 67 



Restricted sense in which the term is here employed — A bacterium 

 probably not a unicellular " Individual " — The bacillary filament 

 or coenocyte ; its possible significance. 



Chapter VIII 



The Discontinuously Zooidal Individual ... 70 



Its general characters — Serial and Lateral Continuity — The strict 

 definition of a " zooid " — The freshwater Hydra ; its description 

 — Discontinuous gemmation — Sexual reproduction in Hydra — ■ 

 Possibility of zooidal progressive diminution — Effects of mutilation 

 in Hydra — Discontinuity produces Release from Arrest — Alterna- 

 tion of generations — Graphic representation of Continuity's 

 evolution up to the Discontinuously Zooidal Individual. 



Chapter IX 

 The Continuously Zooidal Individual .... 77 



Demonstrates the further intensification of Continuity — Diagram 

 showing this — Continuity produces Arrest — Zooidal arrest — 

 Striking examples of alternation of generations offered by this 

 type of Individual — Hydrozoal colonies — All Hydrozoa not 

 Continuously Zooidal Individuals ; and many Hydrozoal colonies 

 not strictly so ; reason why — Terminal compression and " mega- 

 zooidal " Continuity. 



