236 SIR JOHN LUBBOCK ON STIPULES, 
ceeding ones bear a small lamina sessile on the sheath, which is 
wholly adnate to the thin dilated base of the petiole and mem- 
branous, especially outside of the three vascular bundles. One 
or two of the leaves succeeding this have a well-developed 
lamina, and the sheaths partly separated from the petiole and 
corresponding to stipules. The stipular sheaths on succeeding 
leaves are shorter and wholly adnate to the petiole, strongly 
fringed on the margin, with the hairs on the upper portion 
longest and more or less branching. 
This series is shown in figs. 8-10. 
Fig. 10. 
Ribes sanguincum.—A third stage, showing stipules reduced to an adnate 
sheath, S. 
I now pass to the— 
Species without Stipules. 
Saxifraga rotundifolia—This species has very large sheaths 
at the base of the petioles. They may be considered as repre- 
