22 



DESIGN IN NATURE 



PLATE IX 



Fic. 1. 



Fk;. 2. 



Fi(i. 3. 



Plate ix. illustrates spiral formations in plants. 



Via. 1.— Terminal stein and slioot of vegetable marrow with tendrils in various stages of de\-elopmeut, and forming sintrle rin-ht 

 and left-handed spirals, and one double or reversing spiral. " 



A. a, b, c, three sets of youuf,' tendrils closely coiled u]i and forming right and left-handed spirals; d, peduncle bearing 

 five tendrils in various sfciges of development ; e, very young tendril closely coiled and forming a left-handed siiiral • f voun" 

 tendril uncoiling and forming a right-handed spiral ; g, young tendril uncoiling and forming a right-handed spiral ; h younCT tendril 

 uncoiled and ijeginniug to reverse its spiral ; i, mature tendril re-coiling and forming a left-handed spiral. The tendrils e"f a h i 

 have not touched or caught hold of anything, and are therefore natural spiral formations. ; > > i i 



