i9°9] LEAVITT—HOMOEOSIS IN PLANTS 30 



"to distinguish cases where the ordinary course of development has 

 been perverted or changed" (p. 241). This author's Vegetable tera- 

 tology, while it is a rich storehouse of facts for the study of homoeosis, 

 is— as might be expected from the period of its publication— entirely 

 wanting in illuminating discussion and appreciation of relations to 

 the problem of organic evolution such as are to be found in Bateson. 

 The latter author recognizes the presence of homoeosis in plants. 13 

 Sachs distinguished clearly between atavistic formations and those 

 which are merely translocational. His explanation of the aberra- 

 tions now being considered would indeed give a degree of literality 

 to the expression morphic translocation, since he attributes them to 

 changes in sap movement, with disordered nourishment and abnor- 

 mal distribution of the formative stuffs. 14 Penzig's perception of 

 the real nature of the anomalies now under discussion is clear. 1 * 



Modes 



In the 



\ 



om homoeosis 



some of which I may indicate. The facts being superabundant, it 



them 



<* er that new and possibly suggestive points of view may be won. 

 i- The translocation of characters may be acropetal. 

 veryone recalls numerous instances where details of the foliage 

 toothing, texture, hairing, etc.— have appeared in the floral 



leaves 

 leav 



A case of acropetal translocation is that of the corolla fringe, 

 Pcu iar to Gentiana crinita, from its normal site to the summit of 

 "* carpels. 16 A rem*rl™hU f~~.™u:_ u„„ 



more 



nr .i 1 . w "v*xi^v/oit!VU J.ACLO XAIAJJ.^ Lliail V71IV^ L/^V-ll 



semi ' 1 6 secretor y hairs (tentacles) of Drosera foliage to the 



the 



Petal fermce ma y be tesipetal. 



eaoid and sepaloid characters— color, texture, outline— not 



sometimes 



ev en the foliar tk ' ™»^"™ L " c ^^ *<*«-" 



a s c - ine most remarkable case that has come to my 



13 Bateson, op. cit. 1Ih SJo , 



M-^ S T**° rm de f ^-enorgane, | 3 . 



Arbeiten 



* also C w '6° u si S3- /u-Deiten uot. inst. wurzDurg 



^esam. Abhandl. Planzenphysiologie Bd. 2 : 1 159-1 231. 1893. 



Rhod 



Rhodo 



lO-I 



0ra > *• c; Planchon, Ann. Sci. Nat. Bot. III. 9:84, 86. ph. 5, 6. 1848. 



