:/^^. 



Isob .!'^^^^ 



'"n oL 



se 



Thi 



IS 



in 



i 



n 



nlst this 

 glena is goin, 

 omes thinner 

 ?se enlarged 

 len free to 



imcs, whilst fi; 



membrane oft 

 ry active Bacteiis 

 : the brightf f: 

 isms are to i 

 to have k 



> 



*■ 



f 



I 

 I 



)ear 



r% 



taking p^'' 

 Euglena 



I 



f 



)wing 



we have al/ 



I hive ««• 



,fs bad ifl '" . ,t^;L 



liioms 



from 



T//£ BEGINNINGS OF LIFE. 



443 



changes which we 



followed.. Some of them become decolourized and con- 

 verted into Actinophrys, Monads, and Amrebte, after the 

 same mianner as the chlorophyll corpuscles of Nitella (p. 

 408) j whilst others subsequently grow either as Algae, 

 Pediastreae, Desmids, or Diatoms- 

 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^, Pediastreae, Desmids, and 

 Diatoms from individualized and liberated corpuscles 



of Euglena ^ 



We shall now turn to a consideration of the trans- 



c 

 1 



brmations which an entire Euglena may undergo ^ 

 although before dwelling upon them^ certain modifica- 

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



r 



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 



r 



^ 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 Euglenee as well as of Chlamy- 

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

 Euglena^, see Dr. Gros' Memoir, p. 315; for Algse, 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. 4-5:_'Les Chlamidomonas a la 3* parifissure, convertissent aussi 

 leurs 8 divisions en Closteriens (PL O, fig. 2^) tres agiles . . . Les 

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

 des Navicules et des Conferves.' 



f F 



