96 MINUTE MARVELS OF NATURE 



pollen-grains dividing up amongst themselves as 

 the plant growth proceeds to form new grains, 

 until the sac bursts with its store of ripe fertilising 



Fig. 61. The compound pollen-grains of Catalpa 



dust. And this brings us to the pollen-grain itself, 

 for these tiny and beautiful vegetable atoms exist, 

 generally speaking, as individual cells, complete 



