XI 
LIGHT 
IGHT is necessary to all life; the plant cannot de- 
velop without its agency. The coloring matter of 
leaves and flowers is formed under the direct in- 
, fluence of the sun. Different plants require dif- 
Lg 4 VAX ferent degrees of light; some rejoice in the full 
blaze of the sun, others seek the shady retreats 
of woods and rocks. 
Under artificial treatment plants always turn toward the 
light when it comes from one side only; hence it becomes nec- 
essary to turn such plants around frequently to form attractive 
and regular specimens. 
In most dwelling-houses the light, although sufficient, comes 
from one side only. In summer shade should be provided for 
many plants against the direct rays of the sun. 
While light is beneficial and necessary to the organism of the 
plant, an excess of light may be injurious and even fatal to its 
development. Clubmosses, Marantas, and many Ferns will soon 
succumb in the direct sunlight. Several Palms do best in par- 
tial shade. Plants with brightly colored flowers, such as Com- 
positecee and most succulent plants, enjoy the most ardent sun- 
shine. 
