PLANTS. 



63 



roots which extend in different directions, or sends out 

 small branches on all sides. 



S(jnietinies the radicle continues to enlarge and grow 

 downward, forming what is called a tap-root, from which 

 small libers extend out into the soil. Clover, Canada 



The Roots of Plants. 



A, Erigenia, ii-ith tuberous root. /?, /Iii/frrmps, vifhJ!bro7is roofn. C, White 



Clover, with long tap-root and branches. 



thistles, and oak trees, for example, generally have such 

 a tn])-root. The root crops, beets, turnips, carrots, etc., 

 are sim])ly an enlargement of the tap-root, which serves 

 to store up food intended for the support of the plant the 

 following season. 



The growth of roots consists mostly of lengthening by 

 building on additions at the extremities. In this way the 

 difficulty of moving the root through its entire length is 

 avoided, and every part, as soon as formed, is left in 



