1921] BLISS—VESSEL IN SEED PLANTS 325 
PLATE XVII 
Fic. 9.—Longitudinal radial of stem of Gnetum Gnemon e; X 250. 
Fic. 10. este radial section of stem of Gallaun winding * in region 
of primary wood; 
Fic. 11 teins radial section of leaf trace of Gnetum scandens; 
X40. 
Fic. 12 “Se tn radial section of leaf trace of Gnetum scandals 
showing end wall; 50. 
Fic. 13. a yaiadieal radial section of leaf trace of Gnetum scandens; 
X125. 
Fic. 14.—Longitudinal radial section of mature wood of Welwitschia 
mirabilis; 250 
Fic. 15 5 Rong biallital radial section of leaf trace of Welwitschia mirabilis; 
250. 
Fic. 16.—Longitudinal radial section of mature secondary wood of small 
twig of Liriodendron T. wlipifera; X250. 
PLATE XVIII 
Fic. 17.—Longitudinal rg section of root of Liriodendron Tulipifera in 
region of primary wood; 
Fics. 18-20. esemhdieadl fom section of root of Liriodendron Tulip- 
ifera in region of primary wood; X25 
Fic. 21.—Longitudinal radial mie of root of Magnolia Frazeri in region 
of primary wood; X 250. 
Fic. 22.—Longitudinal radial section of first annual ring in stem of Mag- 
nolia Frazeri; 250. 
Fic. 23.—Longitudinal radial section of stem of Paconia moutan; 125. 
Fic. 24.—Longitudinal radial section of leaf trace of species of Paeonia; 
X 250. 
PLATE XIX 
Fic. 25 “Longitudinal radial section of leaf trace in species of Paeonia; 
250. 
Ty 1G. 26.—Longitudinal radial section of stem of Betula alba in region of 
primary wood; X 250. 
Fic. 27.—Longitudinal radial section of vessel of Betula alba in region of 
primary wood; X37 
Fre. 28. betas radial section of secondary wood of Betula alba; 
250. 
Ti 1G. 29.—Longitudinal radial section of stem of Alnus incana in region 
of primary wood; 250. 
Fic. 30.—Same as fig. 29; X375. 
Fic. 31.—Longitudinal radial section of secondary wood of Alnus incana; 
- . 
pe 32.—Longitudinal radial section of leaf trace of Quercus velutina in 
region of primary wood; 375. 
