120 
MR. R. H. COMPTON : AN INVESTIGATION OF THE 
EXPLANATION OF THE PLATES. 
In the following diagrams protoxylem is indicated by solid black ; metaxylem by line 
shading; phloem simply outlined; the endodermis is represented sometimes by a broken, 
sometimes by a continuous line; the epidermis by a continuous line; lines of split are in 
some cases indicated by dotted lines. No ambiguity should arise in the use of these symbols, 
which usually explain themselves or are elucidated in the text. Further signs are mentioned 
when they occur. 
px, = protoxylem. 
mo. = metaxylem. 
— secondary xylem. 
ph. — phloem. 
p.f. = pericycle fibres. 
cor, = cortex. 
sec. — secretory cell. 
ep. = epidermis. 
l.t. = leaf trace (1. first leaf; ii. second leaf). 
f.r. = faisceau réparateur. 
The drawings in which individual cells are shown were made with the aid of a camera 
lucida (Pl. 8. fig. 109 only excepted). 
Figs. 
PLATE 1. 
(Seed lings.) 
1. Medicago lupulina. Fig. 10. Pisum sativum. 
2. Melitotus arvensis. ll. Scorpiurus vermiculatus, 
3. Trigonella cretica. 12. Anthyllis Vulneraria. 
4. Onobrychis sativa. 13. Lathyrus Nissolia. 
5. Caragana arborescens. 14. Colutea arborescens. 
6. Ervum Lens. 15. Trifolium arvense. 
7. Phaseolus vulgaris. 16. Ulex europeus, 
8. Vicia sativa. 17. Lotus corniculatus. 
9. Vicia Faba. | 
Figs. 1-5 and 14-17 are 3 natural size (linear) ; 6-10 are { natural size ; 
11-13 are 3 natural size. 
PLATE 2. 
18-93. Acacia doratorylon. 18, root; 19, 5 mm. below collet; 20, collet; 91, half- 
way up hypocotyl; 22, 2 mm. below node ; 23, base of cotyledon, 
94. Albizzia moluccana, T.S., cortex, half-way up hypocotyl, showing the zone of 
thick-walled small cells. 
25-28. Pithecolobium Saman. 25, root; 26,3 mm. below collet; 27, half-way up 
hypocotyl; 28, 2 mm. below node. 
29-33. Pithecolobium Unguis-cati. 29, root; 30, 5 mm. below node; 31, 3 mm. 
below node; 32, 1 mm. below node; 33, first intercotyledonary internode. 
34-37. Adenanthera pavonina. 34, root; 35, 5 mm. below collet; 36, 4 mm. above 
collet ; 37, 3 mm. below node. 
46-50. Cassia levigata, 46, root; 47, collet; 48, quarter up hypocotyl; 49, 2 mm. 
below node ; 50, base of cotyledon. 
