' 
t 
ms 
S 
Meee 
SP ewes ce 
care?) Leaves 
Sed! 
Probable lines 
of desce 
haded 
Chlorophyll 
Chlorephyi 
No 
ie) 
a 
. \we 
e 
oe) 
Living a 
fossil 
light 
and 
proups 
PRINCIPAL LINES OF ORGANIC EVOLUTION 
Fic. 1 
