209 



At the base of a sucker shoot (usually a congeries of intermediate leaves, 

 developing eventually into mature leaves), one may often (e.g., fig. 5, Plate 266), 

 see a small leaf, more or less ovoid in shape, and succeeded by comparatively large ones. 

 This small leaf is correlated to one of the lower leaves of the seedling, not much 

 higher than the cotyledon leaf. The small leaf has remained stationary in growth, or 

 nearly so, while those above it may have developed into large ones. 



It is time-absorbing, yet most interesting, to watch these changes, and, further, 

 the lowest leaves may, while small, be rubbed off or drop off, or they may continue to 

 develop without check into the large ones seen in Plate ^70. Whatever happens, 

 retarded development through malnutrition or accident on the one hand, or rapid, 

 development on the other, the result is the same in regard to the elimination of the small 

 leaves of the shoot. The same things happen in regard to the youngest leaves of the 

 seedlings, but the development of the seedlings is even more difficult to watch than 

 the shoots. I regret that circumstances preclude representations of the development, 

 extending over a long period, of seedlings and shoots, until they have arrived at a con" 

 siderable size. Mr. "W F. Blakely hopes to take the matter up. 



JUVENILE LEAVES. 



7. Additional Descriptions. 



Under the respective species, in the present work, the following juvenile leaves 

 have been imperfectly described, or not at all. It is understood, of course, that the 

 leaves described are as young as I have seen them. In some cases they will, doubtless, 

 be collected at a still earlier stage. 



46. E. acacioides A. Cunn. 



Sessile, or nearly so, glaucous, linear to linear-lanceolate, thin, about 8 cm. long 

 and 4 mm. wide, venation indistinct. Compare Fig. 11, Plate 52. 



136. E. alba Eeinw. 



1. Shortly petiolate, slightly glaucous, thin, broadly lanceolate to orbicular 

 (say, 9 or 10 cm. in diameter), intramarginal vein at a considerable distance from the 

 edge, secondary veins looped or spreading, making an angle of about 40-50 degrees 

 with the midrib. (E. alba, Eockhampton, Queensland, J.H.M.) 



2. Poplar-leaved Eucalyptus. Petiolate, thick, not glaucous, heart-shaped to 

 nearly orbicular, and to almost reniform, rounded at the base, very large (I have one 

 in my possession almost 30 cm. in greatest breadth and length). The secondary veins 

 very prominent, looped at the base and afterwards more or less parallel (say, 3 or 4 

 cm. apart), towards the periphery of the leaf becoming reticulate and much finer. This 

 character of the secondary veins becoming finer towards the periphery is not unusual 



n juvenile leaves, but becomes more obvious in leaves of large size. (E. platyphylla). 



