1 



Ped; 



lastr 



^^d to b 





e 



13? 



M\, 



5 ^re tho 



teri 



s« Ite 



num. 



of \v\ 



\U 



^' ^'^^ observed,,' 

 ' "modification; 

 t to under 



go 



me. 



I 

 t 



^^^aving lost tbf 

 igated worni.| 

 3rm-]ike maiir, 



cable on accoit 



ik 



?ll-formed 



e bright carmiK 

 fteratinie,tkii' 



liquid; and t! 

 at the laS 

 similar te [ 



f 



er 



space 



It in the vario".^ 



of which the' 



( 



t 



ording 

 nsfor 



tra 



and soni 



etiinf- 



line"' 



ii 



t 



,ther sF^^ 



THE BEGINNINGS OF LIFE. 



447 



Fig. P5. 



Origin of Diatoms, Desmids, Pediastrese, and Algce from Euglen:© and 



other Vegetal Matrices. (Gros.) 



a. Euglena in early stage of transformation into a Diatom, 

 ft, c. Two forms of Diatoms which may arise from transformed Euglen3e. 

 d^ d', Chlamidomonas giving origin to Diatoms. 



e. One of worm-like Euglense, which after increasing in size may 

 gradually become converted into a Closterium (/;. (Reduced.) 

 g, g\ A Euglena undergoes fission, and grows after the manner of 



Arthrodesmus. 

 k A vegetal vesicle of Moss origin, which divides and develops into 



another form of Arthrodesmus. 

 / One of its separate segments, dividing obliquely into two 



portions, each of which gradually grows and assumes the 

 characters of a Navicula (Z-, I/). 

 I A Micrasterias produced by the fission of a Euglena and the ar- 

 rangement of the cohering segments in a single plane. (Reduced.) 

 m. Cladophora-like Alga produced from a Euglena (original X 600). 



