ILLUSTRATIONS. 



FIG. PAGE 



1. Lusus NATURE 6 



2-4. 8 



5. RECONSTRUCTION OF PRIMARY INSECT .... 38 



6. TRANSITIONAL FORM OF INSECT (CARBONIFEROUS) . . 39 



7. BEETLE (JURA) 40 



8. WOOD WASP (JURA) 40 



9. DRAGON FLY (JURA) 40 



10. BEECH, VARIOUS STATES OF PRESERVATION .... 50 



11. PLANT REMAINS IN SAMLAND AMBER 51 



12. RECONSTRUCTED SIGILLARIA 54 



13. TRUNK OF SIGILLARIA SHOWING VARIOUS STATES OF PRE- 



SERVATION 54 



14. LEPIDODENDRON (RESTORED) ...... 56 



15. CORDAITE (RECONSTRUCTED) . . . ... .56 



16. RECONSTRUCTION OF TRUNK OF LYGINODENDRON OLDHAMI- 



ANUM, A FERN-LIKE GYMNOSPERM . . 57 



17. SEED OF SAME 58 



18. SEED-BEARERS AND NON-SEED-BEARERS IN THE OLDER PERIODS 59 



19. CALAMITES AND ASTERO-CALAMITES ..... 66 



20. FERN VENATION OF SPHENOPTERIDIUM .... 68 



21. PINNATE VENATION OF PECOPTERIS 69 



22. RETICULATE VENATION OF ALETHOPTERIS .... 69 



23. ARRANGEMENT OF LEAF SCARS ON VARIOUS SIGILLARIA . 70 



24. CALAMARIA FOLIAGE 74 



25. A Moss (Hyjmum Purum) 122 



26. NEPHRODIUM filix mas 124 



27. POLLEN GRAINS . . . .126 



