224 



run out, and to avoid the danger of losing their 

 sight by its flying into their eyes. 



Besides these plants, the class Monoecia of Lin- 

 naeus contains some of the most valuable trees that 

 grow in England, either originally natives, or in- 

 troduced from foreign countries ; among which 

 are the Oak, the Firs, Beech, Birch, and Mul- 

 berry : and the genus Cu'cumis, which includes 

 the Melon and the common Cucumber, with seve- 

 ral other species, also belongs to it. 



In the twenty-second class, DIOECIA [PLATE 2. 

 fig. 22.], the stamens and pistils are in different 

 flowers, and on separate plants ; the orders in ge- 

 neral depend upon the number of stamens. 



This class, among other valuable species, con- 

 tains the great Date-palm, the Pistachia-tree, 

 Hemp, and the Nutmeg-tree ; with several others 

 that I have already mentioned to you among the 

 native plants. 



The genus Sa'lix, or Willow, contains about 

 sixty native species, and several foreign ones. In 

 some of these trees, all the flowers contain stamens 

 only, two in each flower ; and in others, the flowers 

 have a pistil only, with a divided summit, and a 

 single seed-vessel close below. The flowers are 

 collected, in both cases, into what are called 

 Catkins, from their resemblance to the tail of a 

 cat; each little flower having neither calyx nor 

 petals, but being separated from the rest by a small 

 scale. In the table of the classes [PLATE 2. Class 



