1036 
de Fr aine.— On the Structure and 
The vascular masses subsidiary to the main stele, called by Scott 
‘ meristeles ’, are far less numerous than in the original specimen, a fact 
which may be again accounted for by considering the small size of the new 
stem compared with the old ; they are moreover distinctly smaller (cf. 
PL XCI, Fig. i, with PL VII of Scott’s paper). As very considerable 
crushing and collapse has taken place— so that except in occasional patches, 
where the preservation is excellent, the elements are more or less flattened 
in the plane of the long axis — the dimensions given for the meristeles are 
Text-fig. 6. Transverse section of the primary Text-fig. 7. Transverse section of the 
wood of Sutcliffia insignis. University College, London, primary wood of the new Sutcliffia. x 37. 
Collection (Scott’s section V). x 37. x l = primary x 1 = primary wood; xp. = xylem parenchyma, 
wood; x.p. = xylem parenchyma; s.c. = secretory 
elements. 
only approximately correct. Disregarding the secondary tissues, so that 
more ready comparison may be made with Scott’s figures, the following 
results were obtained for the dimensions of the meristeles figured in Text- 
figs. 8 and 9 : 
y =7x1-5 mm. a 1 = 2-5 x 1*5 mm. 
= 5 xi -5 „ 0 2 = 2Xi-5 „ 
y 2 = 4 x 2-5 „ y 3 = 2 x 1-5 „ 
a = 2-5 X 1-5 „ 
The measurements made by Scott 1 in Sutcliffia insignis were 
a = 7 x 4*5 mm. and /3 = 14 x 4 mm. The structure of the ‘ meristeles ’ is, 
in all cases, precisely similar to that of the main stele, with the exception 
that the zone of secondary thickening does not attain to so great a thick- 
ness, and occasionally does not entirely surround the primary wood. It 
1 Loc. cit., p. 49. 
