14 nor ANY. 



(/) The passage from the condition in the last examples (the so- 

 called circulation of protoplasm) is an easy one to the cases where the 

 whole mass of protoplasm moves along the cell-wall as a broad stream, 

 passing up one side and down the other (the so-called rotation of pro- 

 toplasm). Common and well-known examples of this kind of mass-move- 

 ment occur in Cham, Naias, and Vallisneria. It may also (on the 

 authority of Meyen) be studied in the root-hairs of many land plants 

 e.g., of Impatiens Balmmiiia, Vitia falm, Ipoma'a purpuren, < ucumis, 

 Cucurbita, Ranunculus sceleratus, and Marchantia polymorpha. 



