LIST OF ILLUSTRATIONS. 
PLATES. 
To face p. 
I. Botanic Illustration, 1484-1542 . 145 
II. „ „ 1583-1727 . 147 
III. „ ,, 1798-1904 . 150 
IV. Yariation in Melitcea aurinia .165 
Y. Plan of Hertford .169 
YI. Fruit and Leaves of the Pedunculated and Sessile Oak.. 245 
YII. (1) The Lane up the Yalley of the Bourne, in April, 1904. 
(2) A Gravel-pit in the Bourne Yalley, in April, 1904. 
Photographed by H. Langford Lewis . . Frontispiece , or xli 
OTHER ILLUSTRATIONS. 
Fig. PAGE 
1. Homan Dial from Herculaneum .. . 2 
2. German Dial . .. 3 
3. English Cylinder Dial. 4 
4. Brass Ring Dial. (England) .. 5 
5. Dial in the form of a Ship. (Germany). 6 
6. Brass Quadrant made for Richard II .' 6 
7. Roman Dial. 7 
8. Universal Ring Dial. 7 
9. English Compass Dial . 8 
10. German Crucifix Dial. 8 
11. Gilt Brass Tablet Covers .. . . 9 
12. Ivory Dial, 1561 9 
13. Gilt Brass Dial by Y. S., 1570 . 9 
14. German Chalice Dial ..10 
15. Italian disc-shaped Dial . 10 
16. Japanese Silver Dial (open) . 11 
17. ,, ,, ,, (closed) .11 
18. French Silver Dial . 16 
19. Section at the Gas Works, Watford. 18 
20. Ivy climbing round Blackthorn at Chaul End, Beds . . 65 
21. Sirex noctilio .74 
22. ,, gigas . .. ..75 
23. Galls on the leaves of Salix Caprea .153 
24. Neolithic Celt found at Manor End, Berkhamsted .. .. 157 
Arms of St. Albans. 1720 172 
Hertfordshire. 1803.. 177 
25. Rings of growth of Quercus pedunculata and sessiliflora .. 249 
26. „ „ „ „ ..250 
27. Section in the Gade Yalley, near Hunton Bridge . . . . 254 
28. ,, at Hunton Bridge.256 
