' Grohf/f) of /9/4 



-A 



Groiv//^ o/./9ii 



GroiY//p o/ /9/2.v\ 



-_y 



^yearJ j year^ 



T yeerrj 



/year 2 yearj 3 yearj a year j 



PLATE I. THE AGE OF TREES. 



6 year's 



