THE HOOT- HAIRS 



9 



them are horizontal and lie near the top of the ground. 



Some roots, as of willows, go far in search of water. They 



often run into wells and drains, and into 



the margins of creeks and ponds. Grow 



plants in a long narrow box, in one end of 



which the soil is kept very dry and in the 



other moist: observe where the roots grow. _ 



28. The feeding surface of the roots is 

 near their ends. As the roots become 

 old and hard, they serve only as channels 

 through which food passes and as hold-fasts 

 or supports for the plant. The root-hold 

 of a plant is very strong. Slowly pull - 

 upwards on some plant, and note how 

 firmly it is anchored in the soil. With the 

 increase in diameter, the upper roots often 

 protrude above the ground and become 

 bracing buttresses. These buttresses are 

 usually largest in trees which always have 

 been exposed to strong winds. Pig. 10. 



29. the root-hairs. The larger pari 

 of the nourishment gathered by the root 

 is taken in through root-hairs. Pig. 11. 

 These are very delicati tubes prolonged 

 from Iht surfact cells of thi roots. They 



are borne for a short distance just hack 

 of t he tip of I he root . 



30. The root -hairs are very small, often 

 invisible. They, and the young roots, are 

 usually broken off when the plant is 



pulled up. Thej are best seen when 



seeds are germinated between layers of 

 lark blotting paper or flannel. <>n the 

 young roots, they will be seen as a mould- 

 like or gossamer - like covering. Root- 



I 



12. Aerial ni<.t ol 

 i ii 1 1 1 1 1 < - 1 creep* i 

 or tecoma. 



