- Encystment, 213, 283
- Engelmann, T. W., 210, 285
- Enriques, P., 4, 36, 64, 133, 134, 677
- Entelechy, 4, 714
- Entosolenia, 449
- Enzymes, 135
- Epeira, 233
- Epicurus, 47
- Epidermis, 314, 370
- Epilobium, pollen of, 396
- Epipolic force, 212
- Equatorial plate, 174
- Equiangular spiral, 50, 505
- Equilibrium, figures of, 227
- Equipotential lines, 640
- Equisetum, spores of, 290, 489
- Errera, Leo, 8, 40, 110, 111, 213, 306, 346, 348, 426
- Erythrotrichia, 358, 372, 390
- Ethmosphaera, 470
- Euastrum, 214
- Eucharis, 391
- Euclid, 509
- Euglena, 376
- Euglypha, 189
- Euler, L., 3, 208, 385, 484, 690
- Eulima, 559
- Eunicea, spicules of, 424
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