EXPLANATION OP PLATE VII. 



[Figures natural size, except where otherwise noted.] 



Fig. a, germinating seed; b, young seedling (early spring) with the 8 cotyledons just unfolded; c, seedling a 



few weeks older, showing central cluster of primary leaves just unfolding; d, seedling at the end of the first or 



beginning of the second season, showing bundles of true foliage (secondary) leaves succeeding the primary leaves 



which have disappeared ; e, young tree, 3 to 4 years old, with characteristic large root system ; one-third natural size. 



54 



