THE BEGINNINGS OF LIFE. 443 



followed.. Some of them become decolourized and con- 

 verted into Actinophrys, Monads, and Amcsbce, after the 

 same mianner as the chlorophyll corpuscles of Nitella (p. 

 408) 5 whilst others subsequently grow either as Algse, 

 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, Alg^e, Pediastreas, Desmids, and 

 Diatoms from individualized and liberated corpuscles 

 of Euglense ^ 



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 

 ^ winter coat ^ is formed, and from the opening in 



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

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

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

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

 Pediastrere 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 Closteriens (PI. O. fig. 2-,) tres agiles. . . . Les 

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

 des Navicules et des Conferves.' 



