1005 
Egypt of Linwin usitatissimum L. which I have called Egyptian flax. 
The chief points of difference between these plants are the following : 
the flower, the fruit and the seed of L. angustifolium are smaller 
than those of Ayyptian flax, and moreover the colour of the flower 
is lighter. | | 
The following mean values show this. 
L. angustifolium. Lgyptian flax. 
Length of petal 8.08 mm 16.20 mm 
Breadth „ 445 „ gant ER Stet 
Length of seed 240 „„ 60u: 
Breadth __,, tE ENA a tae 
By analysis of the second generation I was able to show that the 
difference in length of the petal of the two forms is caused by at 
least four factors. This holds good also for the breadth of the 
petal, while the difference for the length of the seed amounts to at 
least four and for the colour of the flower to at least three 
factors. The difference in breadth of the seed is also caused by 
several factors. *) 
I have attempted to trace the behaviour of the above characters 
on hybridisation. The first generation was uniform and intermediate 
in the case of all characters; in the second generation a considerable 
segretation had oecurred. This generation consisted for each of the 
reciprocal crosses of fully 100 plants. Both groups were separately 
investigated. Since these however gave exactly the same results, I 
will only deal with the crossing in which L. angustifolium was the 
father. Of this IL have observations of all characters in exactly 
100 plants. | 
The length and breadth of the petal were determined by taking 
the average values of several flowers; for the determination of the 
leneth and breadth of the seed a greater number of seeds were 
ineasured, mostly 50 tu 100, and the average was taken. The colour 
of the flower was estimated in the manner described before *) and 
expressed numerically. The light colour of the flower of L. angus- 
1) Since the appearance of my above mentioned paper I have succeeded in 
showing that the factors which cause the difference in the colour of the flower 
are distributed over both forms and that these forms have no common factors. The 
proof cf this was obtained by the appearance of white flowers. The plant was 
found in much larger culture than the one previously grown. In this case the 
hybrid thus oversteps the limits of the characters in the parents. 
With respect to the factors for the other characters my investigations are not 
yet complete. 
eel, es p:- 260. 
