PLATE 



LIST OF ILLUSTRATIONS 



PRINTED SEPARATE FROM THE TEXT 

 {Reproductions of Photo-Micrographs) 



1. PROBOSCIS (tonqtje) OF BLOW-FLY - Frontispiece 



FACING PAGE 



2. HOTJSB-FLY WITH EXTENDED PROBOSCIS - - viii 



3. TONQUE OF DRONE-FLY - - - - 3 



4. FORE-LEG OF MALE WATER-BEETLE - - - 6 



5. ANTENNA OF COCKCHAFER - - - - 9 



6. HUMAN FLEA, MALE AND FEMALE - - - 16 



7. FEMALE FLEA FROM BAT - - - - 19 



8. HEAD OP MALE MOSQIHTO FROM INDIA - - 22 



9. CORNEA OF EYE OF BEETLE, SHOWING MULTIPLE LENSES 25 



10. SPINY SPIDER, TRINIDAD - - - - 32 



11. PORTION OF THE CARNIVOROUS PLANT BLADDERWORT - 41 



12. TRANSVERSE SECTION OF MARRAM GRASS - - 48 



13. TRANSVERSE SECTION OF OVARY OF POPPY - - 51 



14. TRANSVERSE SECTION OF LARGE INTESTINE (HUMAN) - 54 

 16. SECTION OF HAND OF HUMAN EMBRYO - - 57 



16. MARINE WORM SHOWING GILLS AND OPERCULUM - 64 



17. PORTION OF KNOTTED THREAD CORALLINE - - 67 



18. POBPHYRITES, EDINBURGH - - - - 70 



19. SECTION OF ARRAN PITCHSTONE, SHOWING MICROLITHS 73 



20. SECTION OF FOSSIL WOOD PROM COAL, OLDBUEY - 80 



vii 



