288 Ewart . — On Leaf-glands of Ipomoea paniculata. 
Fig. io. Transverse section through leaf whose lamina measured 6 mm. from 
base to apex. 
Fig. ii. Secretory epithelium at stage represented in Fig. 6. 
Fig. 12. Do. in leaf whose lamina was 5 mm. long. 
Fig. 13. Same section as shown in Fig. 10, under higher power, to show various 
stages of development in the secretory epithelium. The cells included by the 
lines which meet at x show the line of development. 
Fig. 14. Secretory epithelium at older stage, from leaf whose lamina was 
1 1 mm. long. 
Fig. 15. Do. from leaf whose lamina was 15 mm. long. 
Fig. 16. Do. from fully formed gland. 
Fig. 17. Tangential section across surface of glandular epithelium to show 
grouping of cells. 
Fig. 18. Do. at lower level, to show the lateral walls of the supporting 
cells, bas 1 . 
Fig. 19 Transverse section of very young leaf to show early stage of small 
surface-gland (gl, in Fig. 6). 
Fig. 20. Do. from mature leaf. 
