24 Latent and Semi-Latent Characters. 
in which at least, in spite of every precaution and care, 
I have not yet succeeded in obtaining the one race from 
the other. (Trifolium incarnatum qnadrij oliiim , T. pra- 
tensc qiiinqucfolium, Ranunculus bulbosus scmiplcnus.) 
On the other hand are those races which when cultivated 
on a sufficiently large scale give rise every year to indi- 
viduals which seems to overstep the otherwise fixed lim- 
its of the race. These are therefore inconstant inter- 
mediate races. I regard this phenomenon as one of 
atavism, at any rate in those cases where, as in my own 
observations, they revert from an eversporting variety 
to the type of the parent species without however ac- 
quiring the constancy of the latter. Atavistic phenom- 
ena of this kind are well known in striped flowers and 
variegated leaves ; and I have also found very striking 
examples of it in Linaria vulgaris pcloria and Plantago 
lance olata ramosa (20 and 17). 
Besides the cases which fall into the two categories 
just discussed, I succeeded in finding a third in which one 
intermediate race arose from the other very rarely and 
only in isolated cases. I have seen two cases of this so 
far. One was the origin of Linaria vulgaris pcloria from 
L. v. hemi'peloria ( 20); the other was the formation 
of the double Chrysanthemum segetum plenum (Plate 
II), from C. s. grandiflorum with 21 instead of 13 
tongue-florets ( 18). Linaria vulg. peloria is probably 
an intermediate race, on account of its inconstancy; 
whereas L. vulg. hcniipeloria (with stray peloric flowers) 
is obviously a half race. The origin of the former from 
the latter presumably occurs in nature from time to time. 
My Chrysanthemum segetnm plenum is a novelty in the 
horticultural sense of the term, being just as double as 
the double varieties of other composites; so far as I 
