Tricofyly ami iJic AvnuKjaiioil of I. caves. 367 



the lower whorls, or continue in all (^t them. \n the first 

 case the transition between the two arrangements is often 

 effected by intermediate stages, such as cleft leaves.^ 

 Other disturbances of the disposition of the leaves also 

 can follow on tricotyly, amongst the most important of 

 which are twisted and fasciated stems as well as the pro- 

 duction of so-called terminal leaves. In the following- 

 paragraphs I shall describe some of the most important 

 of these \-arious phenomena which have occurred fre- 

 quently, and in many cases almost regularly, in my ex- 

 periments. - 



It seems desirable to state beforehand that the anom- 

 alies in question exhibit an obAious genetic C(Minection 

 with the splitting or duplication of the cotyledons, al- 

 though this relation needs closer investigation. Other 

 malformations of structure no doubt are also met with 

 amongst tricotylous individuals (for instance, variegated 

 leaves, prolification of flowers and flowerheads), but not 

 more abundantly than elsewhere. ]\Ioreo\er it is by no 

 means a rule that in all species the same anomalies should 

 occur amongst tricotyls. It a])pears, on the contrary, 

 that certain species, (or at any rate, certain commercial 

 races of them), have a marked preference for definite ab- 

 normalities, since both torsions and fasciations appear 

 relatively abundantly amongst certain species, but rarely 

 amongst others. In the same way su1)terminal leaves 

 lia\-e hitherto ])een observed in c|uite a limited number of 

 instances onlv. 



On this relation between tricotyly and abnormalities 

 in the disposition of the subsequent leaves T lia\e based 



^ Delpino, Tcoria dcUa Fillotassi. 



'Further facts will be found in Eiiir Mcthodc, ZwauiisdrchuuQ,cn 

 aufcusiichni. Rer. <\. '1. hot. Ges., 1894. Vol. XII. p. J3. 



