THE BEGINNINGS OF LIFE. 443 



followed. Some of them become decolourized and con- 

 verted into Actinophrys, Monads, and Amoebae, after the 

 same manner as the chlorophyll corpuscles of Nitella (p. 

 408) j whilst others subsequently grow either as Algae, 

 Pediastreae, Desmids, or Diatoms changes which we 

 have also followed in the corpuscles similarly pro- 

 duced from vesicles of Vaucheria origin (p. 415). My 

 own observations on this subject are entirely in ac- 

 cordance with those of Dr. Gros, who speaks of the 

 origin of Monads, Algae, Pediastreae, Desmids, and 

 Diatoms from individualized and liberated corpuscles 

 of Euglenae 1 . 



We shall now turn to a consideration of the trans- 

 formations which an entire Euglena may undergo ; 

 although before dwelling upon them, certain modifica- 

 tions of a less radical kind should also be alluded to. 

 These minor modifications, so far as I have observed 

 them, are of three principal kinds. First, we have 

 those well-known changes by which a brownish so-called 

 c winter coat' is formed, and from the opening in 



1 He also states that similar living forms may be derived from the 

 products of the repeated subdivision of Euglense as well as of Chlamy- 

 domonas. For reference to such a mode of origin of Monads from 

 Euglensp, see Dr. Gros' Memoir, p. 315; for Algae, pp. 309, 322, 327: 

 Pediastrese and Desmids, pp. 303, 309, 318; and Diatoms, pp. 302, 309, 

 315. Again, with reference to the other organisms, Dr. Gros says, 

 p. 455: ' Les Chlamidomonas a la 3* parifissure, convertissent aussi 

 leurs 8 divisions en Clost^riens (PL O, fig. as) trfes agiles . . . Les 

 Chlamidomonas enfin peuvent se diviser normement (fig. 24) et donner 

 des Navicules et des Conferves.' 



