48 



PLANTS AND SUNLIGHT 



cally above the first. This is true, 

 no matter which bud is selected as 

 the starting point. Draw a thread 

 around the stem until the two buds 

 arc joined. Set a pin at each bud. 

 Observe that two buds are passed 

 (not counting the last) and that 

 the thread makes one circuit of 

 the stem. Representing the num- 

 ber of buds by a denominator, 

 and the number of circuits by a 

 numerator, we have the fraction 

 %, which expresses the part of the 

 circle which lies between any two 

 buds. That is, the buds are one- 

 half of 360 degrees apart, or ISO 

 "77! a maple tree on the south side degrees. Looking endwise at the 

 u wn^ir weeks stem , the leaves are seen to be 2- 

 becluse* of'more^un'ii^ht^d ranked. Note that in the apple 



perhaps more food. gnf)ot (Fig _ g^ ^^^ ^ ^^ 



makes two circuits and five buds are passed : two- fifths 

 represents the divergence between the buds. The leaves 

 are 5- ranked. 



78. Rhubarb grown in the dark. The leaf-blades do not develop. 



