Notes on the Anatomy of Stangeria paradoxa. 27 
entirely secondary, show the pitting actually and primitively 
characteristic of primary centrifugal wood. Granted this, we have 
a remarkable resemblance between Stangeria and those Cycado- 
filicales in which the mesarch bundles of the stem show centripetal 
xylem with a higher order of pitting than that of the centrifugal 
primary xylem. It is in connection with this point that Le Goc 
says “ the difference in the nature of the xylem cells could also be 
quoted . . . . ; but this is of little value, as the nature of the centri¬ 
fugal xylem varies so much and so rapidly with the distance from 
the protoxylem, giving in succession spirally thickened, annular, 
scalariform, pitted and multiseriate pitted tracheids.” 
Fig. 9.—Transverse section of bundle from midrib of terminal leaflet 
at level “6' : of Fig. 6. 
In Stangeria this confusion of types of pitting is absent, but 
the clear parallelism is still left between its mesarch bundles and 
those of Lyginopteris, and from this case we can apply the results 
to the other Cycads in which the immediate assumption is, as 
Le Goc remarks, unjustifiable. 
Stem with Vascular Supply to Cone. 
In detailing the material used it was not mentioned that a large 
stem was treated with Eau de Javelle in the same way as that 
employed for the small stem. The results were nothing like as 
satisfactory, but the general arrangement of the bundles appeared 
