From J. A. Gammie 28 August 1874
Government of India
Note for Mr. Darwin on the fertilization of Hedychium Coronarium.1
I have watched the movements of Sphinx moths2 about the flowers of Hedychium Coronarium and captured a large number of them. They come to the flowers, with very rapid flight, immediately after dusk and flit about from flower to flower, hovering about an inch above the petals with their wings at right angles with the filament, and inserting their greatly lengthened proboscis in the tube. The wing, in its tremulous hovering, strikes the filament, about half way between the petals and anthers, causing it to vibrate with great rapidity, quite sufficient, in my opinion, to throw the pollen on to the stigma. I have never found the slightest trace of pollen on any part of the insect, neither have I ever seen the wings parallel with the filament— (which is the only position in which there would be any chance of the pollen being brushed on to the stigma by the insect) but always at right angles. Just before, and at dusk the small hawk moths are very active about the flowers and cause the stamens to vibrate in the same manner as the larger sphinxes do. I may remark that the flowers begin to throw out a much stronger scent towards dusk than during the day, doubtless for the purpose of attracting these night moths.
J. Gammie
Darjeeling | 28-8-74
Footnotes
Summary
Sends his observations on the method of fertilisation of Hedychium coronarium by Sphinx and other hawk-moths.
Letter details
- Letter no.
- DCP-LETT-9609
- From
- James Alexander Gammie
- To
- Charles Robert Darwin
- Sent from
- Darjeeling
- Source of text
- DAR 165: 6
- Physical description
- AmemS 2pp
Please cite as
Darwin Correspondence Project, “Letter no. 9609,” accessed on 28 March 2024, https://www.darwinproject.ac.uk/letter/?docId=letters/DCP-LETT-9609.xml
Also published in The Correspondence of Charles Darwin, vol. 22