176 



TROSERPINA. 



something like this before. Now make another, a 

 little less wide, but with the part for the cylinder 

 twice as long, roll it up in the same way, and slip 

 it inside the other, with the flat part turned the 



other way, e. Surely this reminds you now of 

 something you have seen ? Or must I draw the 

 something (Fig. 22) ? 



6. All grasses are thus constructed, and have 

 their leaves set thus, opposite, on the sides of their 

 tubular stems, alternately, as they ascend. But in 

 most of them there is also a peculiar construction, 

 by which, at the base of the sheath, or enclosing 



