360 Linnean System of Plants. 
all obtained from this tree, which demands a volume to do 
it justice. Some of the most important genera of the seventh 
order, Polyandria, are the beech, birch, nut, chestnut, walnut, 
plane, hornbeam, and oak, an extensive genus, of hich the 
cork tree is a species. ‘The sweet-gum tree (Liquidambar) is 
valuable both for the fragrant gum from which it is named, 
and for its hard and compact wood. Lords and ladies are se 
this order. ‘The last order, Monadeélphia, also, is a very im- 
portant one, comprising the areca-nut tree, the pine, fir, 
larch, cypress, cedar, arbor vitae, &c. Gourds, cucumbers, 
melons, tapioca, castor oil, and various medicinal drugs, are 
obtained from plants of ane order. Here, too, are placed 
the tallow tree, and the poisonous manchineel of the West 
Indies. 
The twenty-second class, Dicecia (two houses), has the sta- 
mens and pistils not only in separate flowers, but on separate 
plants. The principal genus in the order Didndria is the 
willow, of which Sir J. E. Smith has enumerated sixty-four 
native species. In 7)7dndria we find the date palm, and the 
rope-grass, generally used at the Cape of Good Hope for 
thatching houses: and found to be remarkab ly durable. In 
Tetréndria are placed mistletoe, and the candleberry myrtle. 
Pentandria, though a small order, is a wealthy one, being 
possessed of the pistacia, the hop, hemp, &c. In Hewxdndria 
is the yam, and the poplar occupies the order Octandria. In 
Polydndria, besides the butcher’s broom, which has its flower- 
stalk concealed under the upper surface of the leaf, are the 
juniper, the yew, the nutmeg tree, and the pitcher plant, so 
named from a tubular pitcher-shaped appendage at the ex- 
tremity of the leaf: 
In the class Polygamia there are perfect flowers, flowers 
with stamens, and flowers with pistils only, either on the 
same or on distinct plants. Those which bear them on the 
same plant are included in the order Mone‘cia ; those which 
bear them on separate plants form the order Dia’cia. In the 
first we find the genus Mimosa, of which tworemarkable species 
are the sensitive and the humble plants ; the interesting genus 
Acacia, &c. In the second order are the carob tree, the 
fruit of which was supposed to have been eaten by St. John 
in the wilderness, whence it was named St. John’s bread; the 
bread-nut tree of Jamaica, of which the fruit is boiled and 
eaten with their meat by the negroes ; the date plum ; ginseng, 
the root of which is considered, in more countries ‘than ‘ts 
own, as a remedy for every ill, whether of mind or body 
and that peculiarly interesting genus, the fig tree. 
As these letters were intended for the use of persons com- 
