110 
WORLD OF INVISIBLE LIFE 
What is 
complexion? 
the outer layer of skin and we have a fair com¬ 
plexion. If there is more pigment, we are 
brunettes. Strong sunlight on the skin makes 
these grains of pigment become darker, so that 
if we have a great deal, we tan in the sun. If 
we have pigment only in spots, we freckle, and 
if we are very fair, with almost no pigment in 
our skins, we simply sunburn. For the pig¬ 
ment, besides coloring our skin, protects it from 
burning in a too hot sun. 
The skin on the lips has no horny outside 
layer. It is just a fine thin layer of cells through 
which the red color of the blood is very visible. 
