The body of the tree acts as a passage way through which the food and drink are conveyed to the top or crown.

The crown is the place where the food is digested and the regeneration of trees effected.
The leaves contain a material known as chlorophyll, which, in the presence of light and heat, changes mineral substances into plant food.

Chlorophyll gives the leaves their green color.

The cells of the plant that are rich in chlorophyll have the power to convert carbonic-acid gas into carbon and oxygen.

These cells combine the carbon and the soil water into chemical mixtures which are partially digested when they reach the crown of the tree.