THE BEGINNINGS OF LIFE. 



417 



Fig. 82. 



Modes of Origin of Desniids and Diatoms. 



a. Green algoid corpuscles contained within a hyaline envelope which 

 buds from a Cladophora filament. ( X 600.) 



h, c. Outgrowth of Desmids from the surface of Nitella filament— the 

 base being surrounded by a dark brown zone, which persists {d) 

 after the Desmid has disappeared. ( x 600 ) 



e, e. Other filamentous Desmids, springing from a green thalamus which 

 is surrounded by the brown zone. Pediculated Diatoms were 

 also seen budding from the same Cladophora filament. 

 ( X 600.) 

 /. An algoid vesicle ( x 600) budded off from Vaucheria, whose 

 elongated coi-puscles frequently increased in size and became 

 liberated from their envelope {g), after which some of them 

 grew into Desmids {b, h',j, k). Other vesicles {g') gradually 

 become converted into different kinds of Diatoms (/, /', w, 

 m'). (X 1750.) 



n, n'. Origin of Desmids from chlorophyll corpuscles of Vaucheria. 

 ( X 600.) 



YOL. II. 



E e 



