434 



THE AMi:in<\\\ SM l hWLlST 



[Xni.. XLI 



prefers akn.petal). Niiux-li wlu. I.elieve.l that all leaves -row 

 near their apices, stu<li(Ml particularly the leaf development in 

 Aral lit --/nno.s-a L. uliich i> of the Lasifu^jal type/ At the distal 

 ends (.f its chief sul.divisioiis there are lobed leaflets like those of 

 the sumac. Steinheil" who believed that leaf-growth was generally 

 basal, considered that compound leaves were an exception in that 

 their outermost leaflets were the youngest. TrecuF recognized 

 both the basifugal type of comjKnmd leaf and the hasipefal which 

 would inchule both the blackberry and rose. He distinguished 

 also a mixed and a paraUel type. These are discussed and rear- 

 ranged by Eichler^ (])p. 1()-21). In addition to basifugal and 

 basipetal he recogni'/es six types, namely di\-crg(^iir, com ci-geiit, 

 simultaneous, ternary, cyclical, and parallel (but the last is not 

 in Trecul's sense). In the divergent form, the Icallcts develop 



