THE ROOT-SYSTEM ОЕ IMPATIENS ROYLEI. 507 
Wounding of Plants. 
1. Injury to stem. 
А. Twenty plants were wounded at the beginning of August. A deep 
cut was made above either the second or the third node ; it passed nearly 
half-way round the stem and penetrated to the central cavity. 
Ете. 14.— Plant pegged down to lie horizontally along the soil. 
Soil level 
Fic. 15.— Plant buried horizontally under the soil. 
(а) Ten plants were cut above the second node. 
(b) " » " » third » 
The plants were tied to a support so that they should remain in an upright 
position, and were left until the middle of September. 
Results. 
(a)—In four plants there were roots, or signs of roots, just above the cut, 
