Flowers 
The genealogy of the colours might then have been 
as follows :— 
Spore Yellow. 
\ 
Pink. Lilac. Blue. Pale Yellow. —Rich Blues. 
The Spore yellow is extraordinarily common, for we 
find it in pollen, fern-, moss-, and some algal- or fungus- 
spores. Nor is the change from yellow to red confined 
to flowers, for reddish-yellow is one of the commonest 
colours of lichen-cups, of rust-fungi, cluster-cups, and 
even in the Alga Chara we find this same shade. 
Strong sunlight has surely something to do with the 
development of crimsons, rich blues, purples, and the 
like.* 
Bonnier, Kerner von Marilaun, and others have shown 
that lowland flowers, when transferred to alpine gardens 
at 6000 feet, become richer and deeper and more vivid 
* The mysterious reddish substance anthocyan seems only to be formed 
when a process of oxidation is going on.® 
II2 
