250 HALF-HOURS IN THE GREEN LANES. 



a little knob. It is believed by some botanists that 

 these hairs have a peculiar use in preventing ants 

 from climbing the stem, and getting to the flowers. 



With a higher microscopical power, the student 

 will never be at a loss for beautiful objects in the 

 pollen-grain of different species of plants. Indeed 



Fig. 185. Fig. 186. 



Hair of Primrose (Primula Hair of Rib-wort Plantain 



vulgaris). (Plantago lanceolate). 



few natural objects, except the Diatomacese, can 

 compare with them for beauty, both of form and 

 ornamentation. 



In Fig. 189 is given an illustration of the pollen of 

 the Bladder Campion, which, once seen, is not likely 

 to be soon forgotten. The grains of the Broad-leaved 

 Helleborine are shaped not unlike Savoy biscuits; 



