



Fki. 111. — R. stem of Zamin florid 'ana : S, central cylinder of same; 7'. cortical foliar 

 1 mill lie of Offcas n valuta : J', petiolar bundle of same : I". section of part of leaf of a 

 species of Cordaites; II', cotyledonary buudle of Ginkgo biloba: px, protoxylem : 

 x 1 , centripetal wood ; x», centrifugal wood. 



