330 WINGE, THE INTERACTION BETWEEN TWO CLOSELY LINKED LETHALS 
EERE DEZE AI EI EN ATE AIG LEE EPR ROA BICOL AL A RO COLE EE 





normal 
29 da. 
K 28 69 87 
K 35 35 38 
K 39 94 86 
K 40 79 49 
K 51 123 118 
K 55 103 70 
K 57 73 74 
K 59 69 52 
K 60 94 97 
Keeble) | 85 98 
K 62 59 60 
K 87 102 80 
K 88 95 . 79 
K 89 40 34 
K 90 103 98 
K 100 . 68 50 
K 101 72 63 
Found in all. . . 1363 1233 
The crossings mentioned in table V and VI do not directly show 
that the New normals are otherwise than the Old normal type, 
nor was this to be expected. Nor can the crossing New normal 
x New Spread show that the New normals contain the lethal 
factor, for whether a New normal or an Old normal is mated to | 
a New Spread, an equal number of Spread and normal-winged 
individuals will be produced. 
The fourth combination, New normal X Old Spread (table VII) 
on the other hand shall show the presence of the lethal factor in 
the New normal type, as theoretically 2 Spread : 1 normal shall 
be found in the offspring, while as mentioned above an equal 
number of Spread and normal is to be found, when Old normal is 
crossed with Old Spread. 

