42 EASY LESSONS IN VEGETABLE BIOLOGY. 



become stationary. In this state the cell-wall may 

 thicken, and the pond where it dwells dry up, but the 

 mass of bioplasm in the cell may retain dormant life 

 for years, and be ready to resume its work as soon as 

 moisture and warmth shall set it free. 



Many of these resting cells, with red chorophyll, 

 are found occasionally in the snow of northern re- 

 gions, or near the tops of high mountains, perhaps 



Fig. 16. 



carried there by winds, and, finding moisture and sun- 

 light, multiply themselves so rapidly as to color the 

 snow by their multitudes. This forms what is known 

 as "Red Snow." Similar cells may grow rapidly in 

 damp places and form masses which look like coagu- 

 lated blood. In this way we may account for the so- 

 called showers of blood which have sometimes alarmed 

 the superstitious. 



3. Another kind of primitive plants may be found 



