s 
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The variety with yellowish flowers gives M. Decanpnotiy 
an opportunity of making a very curious observation, viz. that _ 
it may be inferred with a degree of probability approaching to 
certainty, that no blue variety of Danuia superjlua will ever 
be found; because blue and yellow being the two primitive 
colours of flowers, and always exclusive of each other, no 
blue flower ever changes to yellow nor yellow to blue. Agree- 
able to this observation, we believe, no China Aster was ever _ 
seen to vary to,yellow. If other similar laws respecting the 
interchange of colours should be discovered, this character 
in flowers may come. to be as truly distinctive, in certain 
cases, as any other, although hitherto, by modern Botanists, 
generally considered of so little value. 
Only two species of the genus Dania are at present | 
acknowledged, viz. Daniia superflua and frustranea (coc- — 
cinea of Bot. Mag. No. 762). 
They have all large tuberous roots, not unlike those of - 
Hexiantuus tuberosus} which should be taken up after the . 
stem perishes, and preserved in sand or dry mould, protected 
from frost during the winter; and in the spring be planted 
out in the open border: or, in a warm situation and dry soil, 
they may be left, without removal, only covering the border 
with dead leaves to defend them from severe frost: Plants 
ratsed from seeds in a hot-bed early in the spring, will some- 
times flower the following autunm ; but not so fine nor so 
_ early as the second year ; when the flowers will begin to-open 
early in September, and continue in succession till overtaken 
by frost. wl 
Native of Mexico. Introduced in 1789, by the Marchiones& 
of Bure. | i: 
cated by the Comte de Vanxpes, who in 
several other varieties from France, where these plants have - 
been cultivated for some years with great assiduity, 
cularly by M. Leuieur, at Séyre, near Paris. = 
oa 
Both our drawings were made from specimens: communi: 
