On the Colour of Leaves of Plants and their Autumnal Changes

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                                uniformly green, presents three separate colours; an outer circle 
of yellow, an inner green and the central portion of the liquid 
is of a blue tint; in such cases, a ring of a pure yellow colour 
often becomes deposited on the edge of the dish. But these
appearances are somewhat exceptional.
Such are the outward characters and appearances of 
the alcoholic solution as visible to the naked eye. I will now 
describe those revealed by the microscope.
Two or three drops of the solution after evaporation on 
a glass slide, exhibited numerous deep green and beautiful 
oil like globules, which were deposited at the edges of 
the liquid; some of these had coalesced, while here and
there small red granules were seen.
A larger quantity of the solution was placed in a 
watch glass and partially evaporated only.
A few drops of the concentrated liquid were now examined,
when it was found that a great many much larger 
green globules had been formed; some of these presented 
a bluish tinge, while others contained a number of small 
colourless globules of an oily aspect.
Two or three drops of a 10 per cent mixture of 
tartaric acid in water were next applied to these large 
green globules, their colour was seen to change at once,
the green was more or less discharged, some of the globules 
became yellow and in others a few ruby red particles 
were visible. [……]
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Manuscript details

Arthur Hill Hassall
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Cite as

On the Colour of Leaves of Plants and their Autumnal Changes, 1892. From The Royal Society, AP/69/1



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