RECORD: Darwin, C. R. Kölreuter J.T `Novi comm Acad Sci Imp Petropol' 20 1775: 431-438. CUL-DAR116.46-47 Transcribed by Kees Rookmaaker, edited by John van Wyhe. (Darwin Online, http://darwin-online.org.uk/).

REVISION HISTORY: Transcribed from microfilm by Kees Rookmaaker, edited by John van Wyhe 8.2015. RN1.

NOTE: Reference: Koelreuter, J.T. 1775. Lychni-cucubalus: novum plantae hybridae genus. Novi Commentarii Academiae Scientiarum Imperialis Petropolitanae 20: 431-448.

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46 recto

N.C.

Act Acad. St Petersburg. Tom. 20. 1775

p. 431. Koelkruter Koelreuter crossed fem. Lych. Dioich. with male cucubulus viscosus: Hybrid intermediate in every respect between father & mother. The “corona faucis small & membranaceous” in hyb; this part beautiful in lychnis & none in cucubulus. One parent hermaphrodite, the other female; Hybrid was less perfect than ordinary hybrids in consequence, – the stamens being unequal & very small, – anthers without pollen: Above fact curious. –

The hybrid flowers dusted with lychnis pollen; the germen slightly swelled, but did not ripen. The hyb. after ceasing to flower in Sep. continued to send forth new stems, as is the custom of hybs, & then & produced a few more flowers just before winter.

46 verso

I think from tone of paper not first – refers to some Opuscula of his – I fear impossible to get

Is Cucubalus viscosus synon of Silene viscosa, this from Levant. & Don says H.

Find out carefully from what country all the species, which produced sterile flowers came from –

Were they not often foreign? – May this not throw some light of great sterility of his hybrids

Too many considerations come into Play – Koelreuter wd have observed any evident facts

47 recto

Tried a cross in 5 flowers reverse of above, but failed; seems to know of similar cases of failures with sexes reversed – Failed in numerous attempts between species of genera, – cucubulus silene, lych. agrostemma – belong to same natural Family – saponaria species being tried of the same genus & of above difft genera. –

p.445. Says sexes of parents make no difference in crosses without one (if I understand right) is living out of its proper conditions & is degenerated

Thence denies that male gives outside appearance & female inside structure. Hence this doctrine is old

p.447. Says many species externally appearing quoad faciem externam far longer more closely allied than the 2 above, quite failed in his attempts to cross. – If I understand right suggests that it is difficult to get with certainty pure pollen

Gaertner shows is a danger. as insects may have brought pollen of the species which is to be impregnated, to that flowerfrom which operator takes his pollen. This source of error I never thought of –

 


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