On the Colour of Leaves of Plants and their Autumnal Changes

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                                fact in connection with the red leaves of both these plants is, that later
on and when they are fully developed, they have become gradually 
transformed into bright green leaves. Many other similar instances 
of the occurrence of young red leaves might be cited.
In certain varieties and species of pink and red geraniums,
we have striking examples of red tints in the older, fully developed 
and yet healthy leaves. The change here is from green to red,
the green never being restored, the red colour moreover rarely 
extending over the whole leaf. The disposition to the developement 
of red leaves is increased as the period of decadence is approached,
as also <s>when it is <\s> the result of any injury or other cause which 
interferes with the nutrition or vitality of the plant or leaf.
A very large proportion, in fact nearly all the full grown and 
healthy leaves of ivy-leafed geraniums are more or less 
coloured on the upper surface, the lower being for the most 
part green; the tints vary from maroon to chocolate, vermilion
or pink, the really green leaves being the youngest.
As examples of the change in leaves from green to red, after 
maturity and previous to their fall, the vine and a species 
of crataegus, C. glabra, may here be referred to. The leaves of the 
vine in the autumn often present the most brilliant and 
beautiful tints, especially when the sun is shining through them,
indeed they then form quite a feature in <s>the landscape <\s> many vineyards.
The Blue Gum, or Eucalyptus Globulus affords an instance 
                            
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Manuscript details

Author
Arthur Hill Hassall
Reference
AP/69/1
Series
AP
Date
1892
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On the Colour of Leaves of Plants and their Autumnal Changes, 1892. From The Royal Society, AP/69/1

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