- Amphidiscs, 440
- Amphioxus, 311
- Ampullaria, 560
- Anabaena, 300
- Anaxagoras, 8
- Ancyloceras, 550
- Andrews, G. F., 164; C. W., 716
- Anhydrite, 433
- Anikin, W. P., 130
- Anisonema, 126
- Anisotropy, 241, 357
- Anomia, 565, 567
- Antelopes, horns of, 614, 671
- Antheridia, 303, 403, 405, 409
- Anthoceros, spore of, 397
- Anthogorgia, spicules of, 413
- Anthropometry, 51
- Anticline, 360
- Antigonia, 750, 775
- Antlers, 628
- Apatornis, 757
- Apocynum, pollen of, 396
- Aptychus, 576
- Arachnoidiscus, 387
- Arachnophyllum, 325
- Arcella, 323
- Arcestes, 539, 540
- Archaeopteryx, 757
- Archimedes, 580; spiral of, 503, 524, 552
- Argali, horns of, 617
Table of Contents
INDEX.
815