42 



III 



The actual sequence of the various parts of this study can per- 

 haps be best understood by following a brief detail of the con- 

 struction of the Chart. 



\^ 168 



rv 108 



III 



" ( 



I. After drawing throughout the field of the Chart the lines 

 of a right-hand primary spiral as the basis of further operations, 



which most nearly approximates in its calculated results to the scheme actually- 

 presented in our Phoenix is Weisse's Mechanical Theory of Transition, in 

 Goebel's Organography of Plants, translated by Balfour, 1900, Vol. I, p. 74 #. 



