54 Introductory View of the 
change from blue to white, and again to resume their blue, 
by being transplanted, and restored to their original sta- 
tion ; anid though green is usually the colour of the calyx, 
it not unfrequently. happens that a flower of gayer habits is 
seen to assume a cloak of yellow, TOs Colon. or crimson; 
while some grave and quaker r-minded plants wear a corolla 
scarcely distinguishable, by colour, from the leaves. Observe 
the calyx of many species of the ranunculus, confounded 
under the familiar name — buttercup, and you will find them 
yellow; in some, the colour is as bright a yellow as the 
corolla itself: the calyx and corolla of the magnificent trum- 
pet-flower (Bignonia 1 radicans) are of thie same colour. 
Fachsa coccinea has a deep purple corolla, within a calyx of 
bright scarlet. “Phe willow-herb (Epilobium), of which many 
species are well known, has a calyx of deep crimson. Daphne 
Mezéreon has a bright rose-coloured calyx, with no corolla; 
the buckthorn, lady’ s mantle, pellitory of the wall, &c., have 
the corolla and the calyx of the same green colour. There 
are some flowers in which, one of ie two being deficient, 
botanists are themselves undecided whether the one which 
remains be properly the calyx, or corolla; but the best rule 
that can be given to a young botanist is, that, in general, the 
stamens are ‘alternate with the petals or segments of he co- 
rolla, and opposite to the leaves or divisions of the calyx. 
The class Hexandria is chiefly composed of what are termed 
lihaceous plants ; by which are meant plants that, by their simi- 
larity of structure, are nearly connected with thé lily. Some 
few of these are in the third class, Tridndria ; but the greater 
number are Hexandrous, and many of them firrmshed with 
the spatha. ‘The great majority of the plants of this class 
are in the order Monogynia, which contains some of the most 
delicate and some of the most splendid flowers that our gar- 
dens exhibit. It will be necessary to remind the young stu- 
dent, that he has more to consider than the number of the 
stamens, and the presence of the pistil, before he determines a 
flower to belong to this class. The stamens are either all of 
equal length, or each three are equal; if four of them exceed 
their br ethren j in length, he will pr obably find that the corolla 
is four-petaled, and may seek it in the fifteenth class. The / 
liliaceous plants are six-petaled, or six-cleft; the style is tri- ’ 
angular, and the capsule has three cells. Of the nineteen! 
genera of this class and order, which grace the British Flor ay 
several are remarkable for their delicate beauty ; the more 
splendid and useful plants of this class are chiefly foreign. ~ 
Who is there that is not acquainted with the little “dr ooping- : 
pearl that blooms beneath the snow, and seems as if it had 
