Maslen . — The Relation of Root to Stem in Catamites . 73 
PLATE II. 
Fig. 7. Longitudinal section cut from the same block as Fig. 6. m. r., medullary ray of stem ; 
i.n.o ., infra-nodal organ; r., root; /. t., position of leaf-trace bundle; n.d. nodal diaphragm. 
Slide 5 M. 
Fig. 8. Another longitudinal section from the same block as Figs. 6 and 7, and showing the 
same root as Fig. 7. r., root, i. n. 0., infra-nodal canal. Slide 7 M. 
Fig. 9. Approximately transverse section of a stem of Calamites with an included root. i. n. 0., 
infra-nodal organ; s.x., secondary xylem of the stem; c.t., contorted tracheides on the inner side of 
the root ; c.p., central part of the pith of the root ; p.p., peripheral pith of the root. Slide 1685 S. 
Fig. 10. A portion of Fig. 9 more highly magnified. Letters as before. 
Fig. 11. Another approximately transverse section from the same block as Fig. 9. The root is 
now farther out. c.p., central pith of root ; p.p peripheral pith of root. Slide 1748 S. 
Fig. 12. Oblique section of a stem of Calamites , showing a root cut quite close to its origin. 
c.p., central pith of root ; p.p., peripheral pith of root. Slide 22 M. 
Fig. 13. A small branching root of Calamites , showing a pith-less specimen bearing a branch 
with a distinct pith. x. m., xylem of main axis ; x. b. } xylem of branch ; p. b ., pith of branch. 
Slide 48 M. 
