THE CARBONIFEROUS FLORA OF BERWICKSHIRE. 271 
Puate III. 
Fig. 14. Tangential section of secondary xylem, showing medullary rays and unpitted surface of the 
tangential tracheal walls. x110, (Slide 2099.) 
Fig. 15. Radial section of secondary xylem, showing porose trachee and medullary rays. x 110. 
Slide 2100.) ) 
Fig. 16. Radial section at the periphery of the stele, showing its periderm ; 7.z., inner zone; 0.2, outer 
zone of the same; 0., the bosses; xy., secondary xylem. x30. (Slide 2099.) 
Fig. 17. Longitudinal section of the inner cortex, showing the sclerotic nests. x30. (Slide 2101.) 
Fig. 18. Transverse section of the cortex of the stem, showing the “‘Sparganum” zone ; /.¢.,1 same leaf- 
trace as in fig. 7. x10. (Slide 2088.) 
Fig. 19. Tangential section through the ‘“‘Sparganum” zone of the midrib. x17. (Slide 2102.) 
Fig. 20. Transverse section of a leaf-trace in the cortex of the stem, showing a single protoxylem, 
x 36. (Slide 2096.) 
Fig. 21. Do. The trace in division. x36. (Slide 2097.) 
Fig. 22. Do. Below the point of division there are two protoxylems. x36. (Slide 2090.) 
Fig. 23. Longitudinal section of the xylem of a leaf-trace in the midrib, showing’ porose, scalariform, 
and transitional pitting. x110. (Slide 2100.) 
Prats IV. 
Fig. 24. Transverse section of the lamina of a leaf. x13. (Slide 678.) 
Fig. 25. Trausverse section of a vascular bundle in the midrib near a point of division ; pra., protoxylem. 
Fig. 26. Transverse section of a stem in Mr Marueson’s block, with false appearance of parenchyma 
the primary xylem. x9. (Slide 678a.) 
Fig. 27. Portion of the same. x30. (Slide 678.) 
Fig. 28. Transverse section of ‘‘Sparganum” cortex of the midrib, cf. fig. 19; scl., sclerotic cortex ; 
ya7., parenchymatous cortex. x15. (Slide 2094.) 
Fig. 29. Transverse section of a stem in Mr Maruzson’s block, showing the beginning of secondary 
ening. x9. (Slide 2105.) 
Fig. 30. Transverse section of outer cortex of midrib, showing a long emergence. x13. (Slide 2093.) 
‘Fig. 31. Transverse section of outer cortex of midrib, showing several short emergences ; sc/., sclerotic 
tex ; par., parenchymatous cortex. x13. (Slide 2095.) 
(All the figured specimens are in the collection of Dr R. Kipstoy.) 
TRANS. ROY. SOC. EDIN., VOL. XLVIII. PART II. (NO. 13). 41 
