200 REPORT OF THE CONFERENCE ON GENETICS. 
may be due to, it can in certain cases be transmitted by way of the seed. 
In this connection it is interesting to observe that in some seedlings of 
very dark-leaved zonal pelargoniums a distinct crescentic mark, of a colour 
corresponding to that forming the zone in the leaves of the parent, appears 
in the cotyledons. 
Very soon three distinct vegetative regions were differentiated in the 
seedling under discussion, one including leaves with normal chlorophyll 
development, the next with variegated leaves, and the third with leaves 
quite destitute of chlorophyll. If a leaf arose ina plane between any 
two regions, it embodied in itself features of both. It sometimes hap- 
pened that a mere thread of white would pass up the edge of a leaf-stalk, 
otherwise green, and connect with the white segment of the blade. 
Fic. 42.— VARIEGATED SEEDLING oF Hysrip Zonaw PELARGONIUM. 
NATURAL S1zE. 
When, this occurred the greater vigour of the chlorophyll-bearing part 
of the leaf was very obvious. 
Ultimately a branch lying wholly in each region was produced. 
Variegation was only once seen in the green branch, a small patch of 
white occurring on one leaf. The variegation of the variegated branch 
was identical with that of the seed-parent. The albino portion showed 
marked persistence. It died back, but new branches soon appeared. No 
trace of green was seen in the branches. The leaves were many times 
smaller than the green ones. The stem was red. It was necessary to 
prune the shoots of the green part, otherwise they would have caused . 
the variegated and white parts to dwindle. 
Although the white part was to be regarded as a parasite, it flowered 
fairly freely. The scape was very light pink. The sepals were white, and, 
