ORGANIZATION OF THE FOSSIL PLANTS OF THE COAL-MEASURES. 779 
Fig. 37. Part of the same radial section as fig. 34, to show developing wood, 
cambium, and phloém. «.*, secondary wood ; ér.’, fully developed tracheides 
with bordered pits; tr., developing tracheide with primordial pits only ; 
cb., cambium; ph.*, secondary phloém; s.v., sieve-tube; s.v.p., compound 
sieve-plate (also visible at other places) ; 7., secondary phloém-ray. X 150. 
C.N. 1628 (see p. 761). 
Fig. 88. Oblique longitudinal section through phloém of another stem. 7., 7., phloém- 
rays; s.v., sieve-tubes ; on several of the walls the sieve-plates are evident. 
x 150. C.N. 1304 (see p. 762). 
Fig. 884. Part of a sieve-tube enlarged from the previous section, at a, showing the 
sieve-plates, «.v.p. x 500. C.N. 1304 (see p. 762). 
