349 BIOLOGY. [Book v. 



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of the favilla, wMcli, in certain species mentioned by Brongniart, 

 have truly the appearance of spontaneous and organic move- 

 ments, since the granulations not only incurve and change in 

 form, but are, besides, paralysed by contact with alcohol and 

 various other substances, which never happens to the mineral 

 particles. 



It seems, then, that there may be, in the phenomena which we 

 have just mentioned, a kind of gradual transition from inorganic 

 movement to organic motility. But many purely organic move- 

 ments take place in the two living kingdoms, and it remains for 

 us to enumerate them, and to indicate, as far as possible, their 

 conditions and laws. 



