different heads, and it is a good exercise. The following table may be
made of the roots they have studied, adding other examples. Dr. Gray says
that ordinary roots may be roughly classed into fibrous and fleshy.[1]
Thomé classes them as woody and fleshy.[2]

[Footnote 1: Gray's Lessons, p. 34.]

[Footnote 2: Text-book of Structural and Physiological Botany. Otto Thomé.
Translated and edited by Alfred W. Bennett, New York. John Wiley and Sons.
1877. Page 75.]

ROOTS.
|
------------------------------------------
| |
_Primary_. _Secondary_.
| |
-------------------------------- |
| | |
_Fibrous_. _Fleshy_. Roots of cuttings
| Aërial roots.
------------------- Sweet potatoes.[3]
| |
_Simple_. _Multiple_. _Simple_.

Morning Glory. Pumpkin Carrot.
Sunflower. Radish.
Pea. Turnip.
Bean. Beet.
Corn. Corn.