On the Colour of Leaves of Plants and their Autumnal Changes

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                                identical with that which is thrown down when a 
considerable quantity of chlorophyll is exposed <s>the<\s> to the air 
for some days; and like it, exhibiting under the microscope 
the same admixture of yellowish, pinkish and reddish 
particles.
The application of the above reagents to small pieces 
of torn up green leaves, gives results similar in the main 
to those of chlorophyll itself.
The Red Co<s>u<\s>louring Matter.
Chlorophyll, the green, while it is the principal, is not the only 
colouring matter of the leaves of plants; the red colour plays a very 
important and conspicuous part in the colouration of the leaves,
especially in the sunny climate of the Riviera, where the observations 
now being recorded were made. So prevalent is this colour and so 
brilliant in some plants, that it adds materially to the beauty 
of many gardens, but little inferior to that imparted by the flowers themselves.
It is <s>not <\s> most conspicuous in the <s>early <\s> spring and <s>late <\s> autumn in 
certain plants; it is found in leaves of all ages; in the youngest 
as they emerge from the bud, in full grown and healthy leaves 
and in the others at the period of decadence and preceding 
their fall.
Notable instances of the occurrence of the red colour in young 
and partially developed leaves, is afforded by the “Gloire de Dijon “
rose <s>in the month of March <\s> and by the castor oil plant. The 
new leaves of this rose are of a rich, dark maroon-red, while those 
of the castor oil plant are of a dark mahogany red. A curious 
                            
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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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