GENETICS: C B. DAVENPORT 
37 
Both in structure and position the antheridia are much Hke those of 
some species of Blyttia, and perhaps still more like those of Calycularia 
radiculosa. 
The archegonial branches are very short, and bear but one receptacle 
which is relatively very large. The receptical is very much like that 
of Blyttia, having a similar large involucre, within which is formed a 
second envelope, the perianth. The latter can be seen in the young 
receptacle as a shallow ring enclosing the group of archegonia. If one 
of these is fertilized, the perianth begins to grow very rapidly, and 
soon becomes a conspicuous tubular sheath enclosing the developing 
sporophyte. 
The young embryo shows a conspicuous suspensor, and very closely 
resembles corresponding stages of the embryo of Blyttia radiculosa. As 
it develops, however, it is more like the embryo of Morkia or Calycularia. 
This is shown in the development of a distinct foot, which is not so 
evident in Blyttia, and the capsule is less elongated than in Blyttia, 
resembling more nearly that of Calycularia radiculosa, with which it 
also agrees in the dehiscence of the capsule. In P. malaccense, the 
capsule opens by two completely separate valves, while in Blyttia (and 
it is said also in P . phyllanthus) , there are four valves which remain united 
at the apex. 
In the structure of the wall, and the markings of the spore membrane, 
P. malaccense much resembles a typical Blyttia. 
It is evident that Podomitrium is much more like Blyttia, than like 
Metzgeria, and should be placed in the Blyttiaceae, rather than Aneuraecae. 
THE FEEBLY INHIBITED. I. VIOLENT TEMPER AND ITS 
INHERITANCE 
By C. B. Davenport 
STATION FOR EXPERIMENTAL EVOLUTION. CARNEGIE INSTITUTION 
OF WASHINGTON 
Presented to the Academy, November 12, 1914 
Recent studies have shown that the impulse to general mental de- 
velopment and the nervous ^strength' which successfully resists the 
stress of untoward conditions and emotional shocks have a clear heredi- 
tary basis. The hereditary factor behaves, indeed, in typical fashion. 
But it has often been pointed out by sociologists, who for the most part 
hold differences in ^conditions of life' responsible for the differences 
between men, that there is no evidence that the elements of moral or 
social behavior have a hereditary basis, and while there have not been 
