1896. ] Remarks upon Paleohillia. 209 
tous. Cells of that shape and arranged in that manner re- 
mind us much of the basal cells of many vegetable hairs, and 
the resemblance is, indeed, very striking. We have ex- 
amined a number of hairy plants, and found exactly the same 
structure. Fig. 3 is for instance the epidermis of a dead 
stem of the common garden pelargonium, where the hairs 
have dropped, leaving only the basal cells, which are, how- 
ever, sufficient to indicate their place. Our next figure (fig. 
4) tepresents also the epidermis of the same plant, but this 
has been taken from a living stem with the glandular hairs 
still attached, one of which has been figured. The aspect of 
this epidermis with the varying number of cells surrounding 
the base of the hairs does not seem to differ in any respect 
from the figure of Paleohillia given by Mr. Knowlton. And 
ifwe now adJ that bands of elonzated cells are also ovserv- 
able in Pelargonium, we feel justified to state that the epider- 
Mis itself does not give any characteristic whatever so as to 
lead us to any conclusion. 
What we have shown to be the epidermal structure of 
Pelargonium agrees, also, with the stem and leaf of many 
other plants of widely different families, so that there is no 
marked characteristic in the epidermis of Paleohillia. The 
lragments of this plant may just as well represent a closed 
sheath or a terete leaf as a stem, and so far the material seems 
00 poor for the establishment of a new genus with ‘‘anoma- 
lous Structure.” 
Washington, D. C., October, 1895. 
EXPLANATION OF PLaTE XVII. 
Fig. . Epidermi illia.—Fi Stoma of same.—Fig. 3. 
Bpidermnig Pe €rmis of Paleohillia.—Fig. 2. Fig a Epes 
ofa livin a dead stem of ghia Sage 3 5 lia ‘Marchantia. 
& 8 stem of same. X s500.—Fig. 
Fig. 6. Epidermis of Nerium Oleander, transverse section. 
