WINTER STUDY OF TREES 33 



end of the annual growth are strongest and are most apt 

 to grow. The specimen illustrated was probably taken 

 from the end of a branch of a rather young and luxuri- 

 antly growing tree. Thus the Ash must have quite a 

 regular growth and form a regularly outlined tree. 



The second twig (Sweet Gum) shows 7 years' growth 

 and is probably a side shoot from more or less within 

 the tree-top. It is stunted in its growth by the want of 

 light and room. The leaves were alternate. 



The third twig (Sycamore) also had alternate leaves; 

 the pointed buds must have been under the leafstalks, as 

 the leaf -scars show as rings around the buds. The larger 

 branch grew three years ago. From the specimen one 

 judges that the Sycamore is quite an irregularly formed 

 tree. The twig had 11 leaves last year. 



The fourth twig (Silver Maple) shows that the plant 

 had opposite leaves, and supernumerary buds at the sides 

 of the true axillary ones; the true axillary buds are 

 smaller than those at the sides. It would, in such cases, be 

 reasonable to suppose that the supernumerary buds were 

 floral ones, and that the plant blooms before the leaves 

 expand. The annual growths are quite extended; two 

 years and a part of the third make up the entire twig. 

 If it was cut during the winter of 1891-92, it must 

 have had leaves on the lower part in 1889 and 12 leaves 

 on the middle portion in 1890, as well as probably 4 on 

 the lower portion on the side shoots. Last year it had 

 14 leaves on the end portion, two at least on each side 

 shoot below, making 24 in all. 



Folding of Leaves in the Bud. 



There are some peculiarities in the arrangement of 

 leaves in the bud which can be investigated only in the 

 early spring. The common plans among trees are In- 

 flexed: blade folded crosswise, thus bringing it upon the 

 footstalk. Tulip-tree. Conduplicate : blade folded along 

 3 



