502 The Inconstancy of Fascia ted Races. 
they manifest a certain order in their disposition since 
they are usually found in that region where other normal 
and abnormal characters also attain the maximum of 
their development. 1 This phenomenon which can easily 
be demonstrated in the fasciated race of Tetragonia ex- 
pansa, is, however, in need of more thorough investi- 
gation. 
But the chief point seems to me to be, as GOEBEL 
pointed out in his work to which we have already re- 
ferred, that the latent factor for the production of anom- 
alies must be present in all those parts of the plant in 
which external influences are able to induce fasciations 
or anomalies. If this is absent no amount of manipula- 
tion is of any avail. It seems, however, that the factor 
for the production of fasciations is pretty generally dis- 
tributed throughout the vegetable kingdom; though it 
is not so general but that there are certain groups in 
which it does not occur. It is a curious fact that fascia- 
tions are much commoner amongst dicotyledons than 
amongst monocotyledons, although some very well-known 
instances are presented by the latter (Asparagus, Liliuui, 
Frit ilia ria , O rch is ) . 
15. HALF RACES WITH HERITABLE FASCIATION. 
It is only by conducting special breeding experiments 
that we can discover for certain whether fasciation is 
heritable in a given species, and to what extent. If, 
however, such cultures are made, we shall soon find that 
these anomalies fall into two categories which are per- 
fectly analogous to the half races and eversporting vari- 
1 See T. TAMMES, Ucber die Periodicit'dt morphologischer Er- 
schcinungen bci den Pflanzcn Kon. Acad. v. Wet., Amsterdam, 1903. 
