EISING PHYLLOTAXIS. 



113 



10 mm. in diameter, shows a very close approximation to such a 

 theoretical construction. By taking a curve-tracing (fig. 46) from 

 this figure, the agreement becomes much more obvious, and the 



Fig. 46.— Curve-tracing of the preceding ; the ray-florets are blocked in and the 

 areas numbered in agreement with the theoretical construction of fig. 43. 



areas are observed to agree number by number with the theoretical 

 system. The figure affords a point of additional interest in that 

 one ray- floret is in excess, and clearly pushed into the circle of 

 rays out of its place. Comparison of the numbered tracing shows 



