Editing On Growth and Form (section)

===5. The Forms of Cells===
[[File:Vorticella campanula.jpg|thumb|''[[Vorticella campanula]]'' (stalked cup shaped organisms) attached to a green plant]]

(1st p. 201 – 2nd p. 346 – Bonner p. 49)
::He considers the forces such as [[surface tension]] acting on cells, and [[Plateau's laws|Plateau's experiments]] on [[soap film]]s. He illustrates the way a splash breaks into droplets and compares this to the shapes of [[Campanularia]]n zoophytes ([[Hydrozoa]]). He looks at the flask-like shapes of [[protista|single-celled organisms]] such as species of ''[[Vorticella]]'', considering teleological and physical explanations of their having [[minimal area]]s; and at the hanging drop shapes of some [[Foraminifera]] such as ''[[Lagena (foraminifera)|Lagena]]''. He argues that the cells of [[trypanosomatid|trypanosomes]] are similarly shaped by surface tension.