IO THE AMERICAN NATURALIST. [VoL. XXXVI. 
represented in eastern Asia and Atlantic North America, but 
not occurring elsewhere. This points to their being old types 
which have persisted in these two widely separated regions, 
and adds to the interest in their history. 
The development of the embryo is quite unknown in all of 
them, but the germination has been observed in Podophyllum, 
both in our native P. 
peltatum and in the Asiatic 
P; emodt, which agrees 
closely with P. peltatum. 
The latter species has 
been carefully studied by 
Holm,! and there are certain 
peculiarities in the germi- 
nation, which, in view of 
the recent discovery in 
Nelumbo, are extremely 
significant. According to 
Holm (and the same is 
shown by Lubbock for P. 
emodt) there are apparently 
two cotyledons, with com- 
pletely united, much elon- 
gated petioles, which form a 
hollow tube, at the base of 
which the plumule is placed 
d p (Fig. 2, 2). Thelatter finally 
grea rinse : bn. wangen emai breaks through the base of 
mule st) at the base of the coli adodaty hic: the coty ledonary tube. 
as seis erar Prec M There would be nothing 
E i especially significant about 
this were it not found that the second leaf, as shown by 
Holm's studies, is deeply bilobed (Fig. 2, C ) and resembles to 
an extraordinary degree the supposed fair of cotyledons. The 
thought was at once suggested, — Is not the supposed pair of 
cotyledons in Podophyllum really a single one, as in Nelumbo, 
the two apparent cotyledons being merely lobes of a single 
on ive mg Botas i IG " a 1899. a : : RU WE # 




