20. THE CRAB-POT 26 21. AN OLD BIRD-CAGE USED AS A CRAB-POT 27 22. A YOUNG NATURALIST AT WORK 32 23. A GOOD HUNTING-GROUND ON THE CORNISH COAST 33 24. ROUND BEND HOOK WITH FLATTENED END 37 25. LIMERICK HOOK, EYED 37 26. METHOD OF ATTACHING SNOOD TO FLATTENED HOOK 38 27. METHOD OF ATTACHING SNOOD TO EYED HOOK 38 28. THE LUGWORM 39 29. THE RAGWORM 40 30. DIGGING FOR BAIT 41 31. METHOD OF OPENING A MUSSEL 42 32. FISHING FROM THE ROCKS 46 33. THE PATERNOSTER 48 34. SECTION OF AN AQUARIUM CONSTRUCTED WITH A MIXTURE OF CEMENT AND SAND 54 35. CEMENT AQUARIUM WITH A GLASS PLATE IN FRONT 55 36. AQUARIUM OF WOOD WITH GLASS FRONT 56 37. HEXAGONAL AQUARIUM CONSTRUCTED OF ANGLE ZINC, WITH GLASS SIDES 57 38. METHOD OF AERATING THE WATER OF AN AQUARIUM 65 39. AQUARIUM FITTED WITH APPARATUS FOR PERIODIC OUTFLOW 67 40. JARS FOR PRESERVING ANATOMICAL AND BIOLOGICAL SPECIMENS 76 41. SHOWING THE DIFFERENT STAGES IN THE MAKING OF A SMALL SPECIMEN TUBE 77 42. SMALL SPECIMEN TUBE MOUNTED ON A CARD 78 43. SMALL CRAB MOUNTED ON A CARD 82 44. SPRING FOR HOLDING TOGETHER SMALL BIVALVE SHELLS 84 45. THE TRIPLET MAGNIFIER 92 46. A SMALL DISSECTING TROUGH 93 47. CELL FOR SMALL LIVING OBJECTS 95 48. SHEET OF CORK ON THIN SHEET LEAD 99 49. WEIGHTED CORK FOR DISSECTING TROUGH 99 50. THE AMOEBA, HIGHLY MAGNIFIED 102 51. " " SHOWING CHANGES OF FORM 103 52. " " FEEDING 103 53. " " DIVIDING 104 54. A GROUP OF FORAMINIFERS, MAGNIFIED 105 55. A SPIRAL FORAMINIFER SHELL 106 56. A FORAMINIFER OUT OF ITS SHELL 106 57. THE SAME FORAMINIFER (FIG. 56) AS SEEN WHEN ALIVE 107