1888. | BOTANICAL GAZETTE. 317 
2and 3, show the band of cork-cells; after the first year’s growth the 
whole circumference is covered by these ; 
Fie Shows appearance of cross-section of a one-year-old stem in 
the region designate in The letters correspond to those 
of fig. 2, except there is in this figure z, the parenchymatic cells of the 
primary cortex or rind, and m shows a cell which has recently divided, 
making three cells. 
i IG. 8. Cross-section of one-half of a wing in the stage represented 
in fig. 4. Lettered to correspon 4 
Fig, 9. oss-section of top of wing as represented in fig. 6, stem 
three years old; sketched after treatment with reagents, therefore walls 
somewhat distorted. : 
Fic. 10. Cross section of a stem four years old, natural size. Lettered 
as the previous figures. 
Figs. 11 to 13 inclusive. Acer campestre. 
cross-section of first year’s g ; 
ened out along the margin, the hairs at h showing that the epidermis 
is still preserved here. Letters correspond as far as possible to those o 
Quercus figures. 
Ia. 12. 
in fig. 11 by the wings 
Fic. 1 
Fig. 14. Acer monspessulanum; d 
%, first year’s wing; «’,second year’s wing. : . 
Fias. 15 i ‘ve. Liquidambar styraciflua. Fig. 15. Ana- 
8.15 to 19 inclusive Liqu Het be a giae: 2 ae tnte 
Cross-section of second year’s growth, exact 
i . 15,6; «, first year’s wing; x’, secon 
June 24th d b, fissures as in 
year’s wing; rrow plate cells of first year ; y’, those of second year. 
Cross section of two y ol 
Fic. 19. Cross-section of six-years’ stem. ee 
Di a i of E. Europzus and varieties. a, epider 
. ie : : ede li - d,chlorophyll! 
mis; b, outside collenchymatic cylinder ; ¢, inside cylinder; d, 4 
holding cells; e, bast fibers in corners; 2, the collenchymatie cells extend 
ing Me phloem cells. 
I 
. : -section cut 
Europeeus var. purpurea; cross-sec 
te ee b, a Nariies cells below; ¢, collen- 
Fic. 22. Same as 21, but cut at a distance 0 
Letters as in 21, except that the cells ¢ can no 
matic. i 
Fic. 23. Same as 21, but cut at a distance of 25 crag ia te foe me 
a, section of cells burst away from the remaining oc gen cells, one side 
each side; ¢, bast cells now fully developed; ¢ @ id oan collenchy- 
of which still show their collenchymatic origin; J, elong 
mati ta : : : th; 
Pe Diagram of stem of E. ovata wing of first year’s growth ; 
6, cork growth uf second year. 
