50 
and 2. Personate^ from persona, a mask, which has the 
appearance of the snout of some animal, the two lips 
bemg closed, therefore there is no hiatus or gape. 
The seeds of the former are naked, of the latter cap- 
suled. And, lastly, the ringent include the natural 
order of the mrticillate, verticillati, plants so 
called from the flowers being placed in xvhorls round 
the stem, add to which the leaves are in pairs, and the 
stalks square. This natural tribe is very remarkable for 
giving out a strong and in some instances a pleasant 
smell. 
Class XV. Tetrad YN A MIA, contains the cruciform 
natural tribe of plants, the (cruciferce) from crux, 
CRUCis, a cross, being four equal petals, placed in the 
form of aii.X. These are fastened to the receptacle, 
within the calyx, by a pale narrow linear part called the 
unguis, or clazv, and spreads out at right angles to 
it, into a broad flat coloured part, called the lamina. 
The plants of this Class are universally found to be 
Antiscorbutic^ their taste is acrid and watery, they lose 
most of their virtues by drying. None of them are 
poisonous. 
In moist situations, and wet seasons, they are most 
acrimonious. Thus the Cochlearia Jrmorack, 
(Horse-radish) growing near water, is so very acrid, 
that it can hardly be used; and Brassica llcipa^ 
(Turnip) whose root in a dry sandy soil is so succulent 
and sweet, in wet stifi' lands is hard and acrimonious. 
4. Classes derived from the consideration of Union, 
