148 
the plate illustrating this article. Solanum Gaertnerianum re- 
sembles the nightshade more than the pai The leaves are 
less entire than those of the nightshade. Th 
in color and are dwarfed, the petals remaining aidime entary 
This ane fruits sparsely but some seeds are perfectly ree 
and produce pure nightshade pl 
In general shape the leaves = ae form Solanum Koelreuter- 
ianum resemble strongly the tomato, but the epidermis is free of 
hairs like the nightshade. The flowers are white yith y: yellow 
middle streaks. The fruit does not mature. This particular 
type has appeared ie different tim 
The form called num proteus Be resembles the tomato 
more than the erie although not to the extent of leaf 
ads seen in S. Koelreuterianum. The stems and leaves are 
airy. ie fruits aay any are smaller than those of the tomato, 
oo resemble the 
The ae 7 these types of plants, each readily distin- 
ae from the other, and from the tomato the nightshade, 
aroused anew the interest in plant ey and cies p clare 
Their peaant intermediate character seemed strong e in 
support of the view that they were all true graft- ea aaitee 
from a fusion of the vegetative cells of the tomato and the night- 
shade, ie fusion occurring on the region of the contact of stock 
and sci 
ne this time certain investigations by Dr. Erwin P aur on 
the white margined varieties of Pelargonium plants showed that 
these plants with white-bordered leaves have peripheral layers 
of white cells covering the inner green tissue. Such plants con- 
sisting of two kinds of cells with a peripheral distribution of one 
were named fericlinal chimeras. It was suggested that the 
supposed tomato-nightshade graft-hybrids were in fact periclinal 
chimeras. After making careful anatomical and cytological 
examination of them, Dr. Winkler silos that the four forms 
described above are perielinal chimeras. S. tubingense and S. 
reverse is true of S. Gaertnerianum and S. Koelreuterianum. It 
appears that S. tubingense has a single peripheral-layer of tomato 
