My dear Hooker

I have reread your paper on Listera² & have been looking as specimens, & have hardly ever been more amused. In Neottia nidus-avis, the rostellum is thicker, & the summit is so wonderfully sensitive, that a touch from a child’s hair, not held close to point was sufficient to cause the ejection of the fluid!! & what delighted me was that this fluid sets so quick, becoming slightly opake, that in 2 seconds or even less when the touching object was withdrawn, a mass of pollen was withdrawn with it.—   I send the hair in quil, with which I touched top of rostellum of Neottia, & almost instantly withdrew it & you will see (if you think it worth cutting open quil) pollen glued to end. So that insect by this wondrous contrivance would be sure to carry pollen from flower to flower.—   The same thing happens with Listera, but in this case whole pollen-mass in a flower only lately expanded, is with drawn.—

I cannot believe from what I have seen that pollen mass can be ejected by the ejection of fluid matter; for during first second it is not very viscid. A more important difference is that in Neottia pollen is shed in bud & is cast irregularly on to the rostellum & does not adhere to it till the fluid is ejected; & the adhesion is indefinite ie to any point of the pollen-masses, & not to the apices of the pollen-mass as in Listera.— I suspect, from one case that I saw that pollen-masses are ejected from anthers of Listera with force, before & independently of ejection of fluid.—   I can see that this viscid fluid is analogous to sticky gland of orchis, but it seems to me, in my ignorance, that in Listera the opposite end of pollen-masses are attached, to what is the case in Orchis.—³

In Cephalanthera grandiflora the pollen-masses are shed in bud & stand close in two friable column close to upper edge of stigma; & this upper edge, (which I presume answers to rostellum) whilst in bud-state, ejects fluid (without touch) on each side & glues the pollen-masses there; as the rim with the glue turns reddish, it is probably homologous to the viscid secretion of Listera & Neottia.—⁴ I am sure I do not know whether you care enough about Listera to hear this about Neottia.

Yours affect | C. Darwin

It requires no sort of answer.

I can see externally to loculi in rostellum of Neottia.—

I have got good facts about moths & orchids.— good evidence thank Heaven of pollen-masses of Bee Orchis adhering to proboscis of moth; & one moth sent me with 13 pollen-masses of some orchis adhering to its proboscis, rendering it quite arborescent.—⁵ I could recognise pollen-mass of Butterfly-orchis on 2 other moths.—