CELLS. SILICA. 
55 
conclusive opinion as to their nature. One of the com- 
mon meadow grasses, Fes- 
tuca pratensis, here also re- 
quires notice. In the palese, 
cups of silica as they have 
been termed by the Rev. J. 
B. Reade, are very abundant. 
In the specimen represented, 
by Fig. 4 1 , which is a portion 
of one of the paleee in the 
natural state, longitudinal rows 
of these cups may he observed ; the hairs also on their 
edges are exceedingly sharp, and abound in silica. 
The leaves of most species of Deutzia are remarkable 
for having stellate hairs developed from the cuticle 
FIG. 41 . 
Portion of palea of Festuca pra- 
tensis. 
FIG. 42 . 
Siliceous cuticle from the under surface of the leaf of Deutzia scabra, 
exhibiting sinuous cells and stellate hairs. 
of both their upper and under surfaces; in Fig. 42, 
some of these are represented. This cuticle, in common 
