350 The Romance of Wild Flowers 
Owing to the fact that Grasses grow together in 
such enormous numbers, cross-fertilisation by such 
means is certain; but in addition a little pollen- 
carrying is done by certain small flies. The seed is 
a hard grain, of which Wheat, Barley, and Oat are 
familiar examples. It is frequently wrapped closely 
within the palea, requiring the operations of the mill 
to separate it in those grains used for food. 
