RECORD: Darwin, C. R. 1841. Observation on humble bees flying from Rhododendron A. to Azalea pontica. CUL-DAR49.21. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 10.2019. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with the permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volume CUL-DAR49 contains notes for Natural selection chap. 3 on 'On...organic beings occasionally crossing' or dichogamy.

Introduction by Christine Chua:

According to Darwin's personal Journal (DAR158.1-76), the family went to Maer on May 28th. The Elizabeth mentioned here could be Darwin's mother-in-law.


21

Maer June 1841. Saw humble fly from Rhod. azaloides to A. pontica, back to Rho. A. just alighted on pink A. & flew to common Rhod. On one of the just opened flowers saw a grain of pollen by the side of stigma, next morn (Thursday [Jun. 3]) found 3 of the stigmas so covered with pollen as to be plainly visible to naked eye one with about 40 grains & then 4 more with few [sketch] & [?] having many with one other. Hence feel pretty sure, not there yesterday. Not many flowers open about 50. I think bees don't visit this flower much & therefore don't go particularly near stigma bite a hole at the bottom of corolla. There were as many as at least 100 gr. of pollen on each of 3 stigmas. Pollen manifestly either azalea or Rhod. This flower is "common". Stigmas being surrounded by 9 anthers of equal [?] rather less height & not distant, so will [shews] facility of introduction of foreign pollen.

∴ I find them in azalea pollen on all them, but besides pollen of the other kinds

[2v]

Saturday (after ten gloomy days) although in flower some weeks & I never saw second Bee on it though Elizabeth did once. – saw a second Humble – saw 3d

I found almost every other stigma with some pollen so then I [parted] with country – I think one heart with 8 flower, 6 had pollen & I believe all of some of azalea. Another bee with four, two had some & rather [illeg] of azalea 

4 B [ ] in azalea pontica [close] G but much out of flower.

[examined with lens alone. infin]

Monday – Picked bunch with seven flowers; - 5 had pollen like azalea – one apparently of pollen of this kind. on one no pollen. -

Wednesday Thursday – Bunch of grey flower. 8.  [as] one [ ] in azalea – pollen. some of them with some pollen of some kind.

After a wet day- ; 20 pollen on stigma / whole bunch do.

do. Is it effect of rain or yellow neighbouring azaleas having gone out of [ ]

4 Bees all together seen

4 B [ ] neighbouring Rhd. Pontica sterile

The rarity of Bees on this flower valuable; as I have seen them & [illeg] them on Peas Beans & the [illeg] which I gather whether Bees sufficient in this [illeg]


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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

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