208 



BOTANY: PRINCIPLES AND PROBLEMS 



particular kind of wheat plant which is to be produced. These 

 minute particles of protoplasm, into which so much is packed 

 and out of which so much emerges, are certainly among the most 

 remarkable bits of matter in existence. 



Fig. 1 !'.•. -\';iiiati()ii in number, form, and size of leaflets in 1 ho bhie elderberry, 

 Sambucus glauca. (From Bahcock and Clausen). 



Variation. — Close as the resemblance is between parent and 

 offspring, however, it is almost never an exact resemblance. Any 

 individual plant or animal, if studied closely enough, will be 



