124 THE BEAUTIES OF NATURE CHAP. 
flower (Fig. 6) consists of a narrow tube, some- 
what expanded at the upper end (Fig. 7), 
where the lower lobe forms a platform, on 
each side of which is a 
small projecting. tooth 
(Fig. 8,m). The upper 
portion of the corolla 
is an arched hood (co), 
under which lie four 
anthers (a a), in pairs, 
while between them, 
and projecting some- 
what downwards, is 
the pointed pistil (s¢) ; 
the tube at the lower 
part contains honey, 
and above the honey 
is a row of hairs running round the tube. 
Now, why has the flower this peculiar 
form? What regulates the length of 
the tube? What is the use of the arch? 
What lesson do the little teeth teach 
us? What advantage is the honey to the 
flower? Of what use is the fringe of hairs? 
Why does the stigma project beyond the 
Fig. 6.— White Dead-nettle. 
