CLOSELY LINKED LETHALS IN DROSOPHILA” ETC. 461 
To Dr. Monr’s remarks to my mistake I want to declare the 
following. 
I received from Dr. Morr some few Drosophila cultures, all 
with the formula written on thetr label. On one of them was 
written in Danish-Norwegian language: “Spredte vinger”, and MOHR. 
added in my presence: “Dich (III), Star (II), but nothing about 
_ the lethal factor “vit” that I found in the material. — I was con- 
vinced, of course, that “Spredte vinger” was identical with the 
mutant “spread wings” and I did not realize that Mour intended 
to state, more generally only, that it was a type with divergent 
wings (namely “Dichaete”). —.At the same time I received f. i. 
another stock with the following designation: “Sort legemsfarve” 
(translated = black body-colour) and “Korte vinger” (translated — 
short (vestigial) wings), and hereto Dr. Mour added: “let, pr, vg,. 
arc, sp’. This type had the black-factor, though the factor-desig- 
nation was only wriiten in Danish-Norwegian language. 
When I later on used the material with divergent wings, I 
substantiated that Star was no more present, nor was Dichaete 
zt, after the description of Nachtsheim: “Borsten verdoppelt. 
Dominanter Faktor’ (Sammelreferat in Zeitschr. f. ind. Abst.- 
und Vererb. Lehre, Vol. 20, 1919, p. 131). This statement of 
NACHTSHEIM that the bristles are redoubled is due to a misunder- 
standing, what I did not know, when I wrote my paper. Further- 
more N. does not say anything about the wings. I was convinced 
therefore that only the factor spread rested. Hence the mistake!’ 
Dr. Monr’s unlucky designation of the material, in connection 
with the lapse of Dr. NACHTSHEIM as to Dichaete, and the cir- 
cumstance that I had taken upon me to send in, at short notice, 
an article to the Mendel number of “Genetica”, give the expla- 
nation of a mistake that I regret highly myself. 
In my paper, therefore, Spread everywhere must replaced by 
Dichaete. — The analyse itself, the interaction of the two lethals, 
of course is correct enough. The new lethal, as I have called vit, 
is not found on the last map of factors from the MORGAN Labo- 
ratory. Ö. WINcE. 
Oct. 26. 1922 
