276 RELATION OF PHYLLOTAXIS TO MECHANICAL LAWS. 



that accepted interpretations of the facts of ontogeny are very 

 conventional. 



Fig. 96. — Eccentric growth ; system (5 + 6). 



IV. The essential point in such a construction is that the 

 eccentricity is progressive, and is therefore increasingly obvious at 

 the periphery of the figure, while towards the centre it may be 



