""■^' to , N 



hei 



cir w 



"ant of «. 



*j 



a 



s^, 



recent 



i-Rrow 



S, 



"• Sott 



ms already a|; ' 



more rec •, 



much 



r 



'^ notion tbtt; 

 peciallysiocsi: 



cs 



about the mofc' 

 im^ Ofcoursr:, 



* 



are only 



ii 



i^n concerniDE ..; 



■anisms might t 





also be deri&i 



) Diatoms 



led ii^^^ 



Pedis-'''" 



5 or 



Artbro^""'i 



aatioi^ 



3 



Di' 



C: 



en 



CO 



iiser^' 



^r^l 



12 



Ed.,P-^^' 



ZffS BEGINNINGS OF LIFE. 



449- 



vesicules parifissees adherentes entre elles^ va jusqu'a 

 1^ 3% 4^ 5^ ^^ division ces vesicules s'arrangent sur 

 un meme plan; celles du contour poussent des cornes 

 et presentent les jolies formes des Micrasterias ^' 



Whilst 



transformation into one or other of the 



varieties of Arthrodesmus {g^ h) seems to occur still 

 more frequently. Dr. Gros writes : — ^ Les Arthrodesmus 

 qui ne sont que le 3^^ degre de parifissure prenaient des 

 formes d'autant plus exigues que les utricules^ d'ou ils 

 descendait, etaient plus petits^/ One of the con- 

 ditions under which Euglense are prone to undergo 

 transformation into Pediastrese has also been definitely 

 ascertained. Dr. Gros observed that when Euglense 

 were sown upon a small patch of damp earth some of. 

 them generally underwent this kind of metamorphosis^ 

 although others passed through different changes, so as. 

 to become converted either into Diatoms or into the 

 organisms of which we are now about to speak ^. 



Transformation into Con ft 



Not 



trices moreo^'f ultimate products of repeated fissions of Euglen^ be- 

 come converted into small Conferva, as we have already: 



r 



ird and subsf 



r 



stated (p. 443, note i); but occasionally an Euglena,' 

 without such preliminary processes of fission, begins to 

 vegetate so as to produce a much larger Algal filament 



^ See loc. cit., p. 311, and PI. K, fig. 25. 



^ PI. P, fig. 20-23. These transformations of Euglenae into different 



kinds of Pediastreoe are also referred to by Dr. Gros at pp. 303, 309, 318, 

 and 452, , - 



^ Seep. 453, , - .. 



VOL. II. 



Gg 



