32 



FOOD RESERVOIRS 



purplish brown color appears, starch is present. Cut the 

 part open and moisten the fresh surface with iodine (to 

 be had at the drug store). The test will usually give 



43. A winter branch bearing leaves inside a window, while still 

 attached to the tree outside. 



the best reaction when the part is perfectly dormant. 



Starch may be found in nearly all twigs in fall and 



winter. Test them. 



76. This stored plant -food enables the plant to start 



quickly in the' spring, without waiting for full root -action 

 to begin ; and it enables the plantlet in the 

 seed to grow until it establishes itself in the 

 soil. The flowers of early-blooming trees are 

 developed mostly from the nourishment 

 stored in the twigs, not from the materials 

 taken in at the time by the roots. This can 

 be demonstrated by bringing branches of 

 peach, apple, and other early - blooming 

 plants into the house in the winter and 

 keeping them in water; they will bloom and 

 44 ^ffiS lbc '*~ sometimes even make leaves. Study Fig. 43. 



