Dr. Tully on Datura. 255 
nous pericarps, the ovate or, if tens the cordate and 
sharply dentate and glabrous leaves are unquestionably com- 
mon to both the American sorts. Even most of the addi- 
tional circumstances which are commonly mentioned inci- 
dentally, are nearly uniform ineach. The D.Tatula, although 
occasionally larger and less slender than the D. Stramonium; 
is by no means generally so, nor is there a regular and uni- 
an acute Pin the leaves are as sharply dentate and as muc 
sinuated in one as the other, and in some instances they are 
both attenuated into ee pebble; or both, as it were, truncate 
at the base. In the smaller plants of each sort, the stem is 
commonly pithy, and in the larger of each, it is hollow. 
e white corol of the one, which verges to a cream col- 
or, a the pale blue or light purple of the other, striped 
with deep purple on the inside, are indeed almost always 
observable, but not sufficiently prominent for distinction; 
but the purple stalk sprinkled with green points in the one, 
and the uniform green stalk of the other, I have reason to 
think, are invariable and permanent. 
ave been many years in the habit of observing the two 
sorts mse noticing this difference, and for ten years at least, 
I have viewed them closely, in reference to their distinction 
of species. My observations have been made both where 
they grew entirely separate, and where they grew together, 
and I have cultivated them in both situations,without ever be- 
ing able to discover the least approximation ‘of the one to the 
other, or to detect any intermediate specimen; and contra- 
ry to my expectations, I have never seen, among the plants 
produced from seeds, and growing together, any evidence of 
promiscuous impregnation and the production of pach” 
ven in the spring season, the last year’s dead and half de- 
cayed plants of each sort, may always be distinguished with 
perfect facility. 
aces where only one sort has been common, time 
immemorial, I have never known the other make its appear- 
