i ^ 



'^5. 



rather - ■ ' 



77/5' BEGimmNGS OF LIFE. 



■417 



^ 



luently bise 



^P^^ a greenis 

 soon began tj 



smidsjofwtit! 



re seen in ai 



entativesoftlt 

 ,ler colour, 331 

 Dlouring matttf 



D comparativelf 

 lese bodies ifr 

 ' obvious 

 exact pattcf' 

 to much variJ' 



iatoms 



seem 



K 



I 



lifF.^rentin^W'J 



tri 



iation 



:i 



,ts of ' 



Fig. 82. , 



Modes of Origin of Desmids and Diatoms. 



fl. 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'. 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 corpuscles frequently increased in size and became 

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

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

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

 m'). (X 1750.) 



^, n\ Origin of Desmids from chlorophyll corpuscles of Vaucheria. 



( X 600.) 



VOL. II. 



E e 



