I04 MINUTE MARVELS OF NATURE 



are considering but a microscopic grain of dust 

 barely visible to the keenest eye. It is so easy, 

 when engrossed in microscopic subjects, to forget 

 how infinitely small is the original before us. 



Fig. 67. Pollen grains of Monarda, showing the character- 

 istic ridges of the Labiate order 



Each of these wonderful and beautiful granules 

 we find perfect in structure arid habits, given 

 favourable conditions, and yet the abundant 

 quantity that is produced is quite astounding. 

 It has been estimated that a single flower-head of 

 dandelion produces on an average no less than 



