250 LOTSY AND KUIPER, A PRELIM. STATEMENT OF RESULTS OF MR. THE 
wa x Be Ss 
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F, silver hen silver = both of which are Ss 
OTIB € 
GEEL 
silver hen sifver cock gold hen silver cock 
F, Ss ES) ss Ss 
From a cross of a gold hen with a silver cock we consequently get in 
F, no gold cocks. 
From the reverse cross we do. 
silver hen Ss gold cock ss 
eu de AR 
ne 2 
F; gold henss silver cock Ss 
BT ren 
(Fs) Gs) Fs) €13) 
(SSOP 
2 silver hen Ss silver cock Ss gold hen ss gold cock ss 
Our case can therefore most easily be explained by the assumption 
that the cock 276.1 was Ss like the F, silver cock in the above scheme 
and that the hen 276.9 was golden s.s.; and that the silver factor S was 
suppressed by the inhibitor factor I in the cock 276.1, as in that way the 
appearance of the red black cock 607.3 would be fully explained. 
We have however no certainty that this is the real explanation as the 
gold cock 607.3 may also owe its black redness to the inhibiting factor 
I in the presence of the silver factor S. By its premature death we ware 
unable to test it as to this point. 
One thing however is certain, either the hen 276.9 or the cock 276.1 must 
