40. Diatoma vulgaris.
41. Difflugia cratera.
42. " globosa.
43. Dinobryina sertularia.
44. Dinocharis pocillum.
45. Dirt.
46. Eggs of polyp.
47. " entomostraca.
48. " plumatella.
49. " bryozoa.
50. Enchylis pupa.
51. Eosphora aurita.
52. Epithelia, animal.
53. " vegetable.
54. Euastrum.
55. Euglenia viridis.
56. Euglypha.
57. Eurycercus lamellatus.
58. Exuvia of some insect.
59. Feather barbs.
60. Floscularia.
61. Feathers of butterfly.
62. Fungu, red water.
63. Fragillaria.
64. Gemiasma verdans.
65. Gomphospheria.
66. Gonium.
67. Gromia.
68. Humus.
69. Hyalosphenia tinctad.