INDEX 



1139 



ANA 



APF 



Analysis, micro-chemical, 1102 ; method 



of, 1102 



Ajiaraphidece, 599 

 Anchor-like plates of Synapta, 895 

 Andalusite, 1077 

 Androspore of (Edogonium, 572 

 Anemones, 863. See ACTINOZOA 

 Anemophilous flowers, 722 

 Anethum graveolens, seeds of, 724 

 Angle, extinction, 1079 

 - of incidence, 3; of refraction, 3; 



of aperture, 61 

 Angles of aperture, air, balsam, oil, 



water, 83-87 

 Angstrom's law for the absorption of 



light rays, 323 

 Anguillula aceti, 945 



fluviatilis, 945 



glutinis, 945 

 Anguillulce, 945 

 Angular aperture, 395 



of dry objective, 391 ; of oil immer- 

 sion, 391 



- of aperture, resolution dependent 

 on, 44 



of water immersion, 891 

 Angular distribution of rays, 56 ; grip, 



61 ; semi-aperture, 77 



AngulifercE, characters of, 613 



Animal kingdom, two divisions of, 727 



Animalcule cage, 346 



Animalcules, 753. See KOTIFEBA, Infu- 

 soria, KHIZOPODA, &c. 



Animals and plants, differences between, 

 530 



Anisochelae of sponges, 860 



Anisonema, 765 



Annual layers in trees, 704 



Annular cell, Weber's, 350 



ducts of Phanerogams, 698 



illumination and false images, 419 



illumination for examining perforated 

 membrane of diatom, 419 



Annulata (Annelids), larvae of, collecting, 

 529 ; marine, 947 ; appendages of, 949 ; 

 jaws of, 949 ; development of, 949 ; 

 eggs of, 950 ; fresh-water, 955 ; lumi- 

 nosity of, 955 ; bibliography, 956 ; 

 ' liver ' of, 1047 



Annulus of sporange of fern, 676 



Anodon, pearls in, 923 ; glochidia of, 

 933 ; for observation of ciliary motion, 

 940 



Anomia, prismatic layer in, 924 



Anopla (Nemertines), 951 



Anoplophrya circulans, 774 



Anorthite, 1080 



Antedon, food of, 771 ; pentacrinoid 

 larva of, 900-902 ; pseudembryo of, 903 



Antennae of insects, 987 ; preparation of, 

 988, 989 note 



Antherid of Vaucheria, 563 ; of Chara, 

 577, 578; of Fucacece, 627, 628; of 

 Floridece, 631 ; of Peronosporece, 638 ; 

 of Marchantia, 665, 667 ; of mosses, 

 ^>70 ; of Sphagnacece, 673 ; of ferns, 

 677 ; tapetal cells in, 678 



Antherozoids, 536, 540 ; of Volvox, 555 ; 

 of Vaucheria, 563 ; of Sphceroplea, 

 572; of (Edogonium, 572; of Batra- 

 chospermum, 574 ; of Chara, 579 ; of 

 Phceosporece, 627; of Fucacece, 628; 

 of ferns, 678 ; of Rhizocarpece 681 



Anthers, 719 



Anthony (Dr.), on pseudo-trachea of fly's 

 proboscis, 990 note 



Anthophysa, 765 



Antirrhinum majus, seed of, 724 



Apertometer, 195, 390 ; Abbe's, 307, 394 ; 

 Tolles', 390 ; use of, 394 



Aperture, in microscopic objectives, 33, 

 42-50, 60 ; how obtained, 45 ; Abbe on 

 definition of, 45, 48 note 



angular, 49 note, 53, 395 



numerical, theoretical maximum of, 

 30 



numerical, 49 note, 53, 76, 390 ; for 

 dry objective, 50 ; for oil immersion, 

 50 ; for water immersion, 50 



numerical, of Zeiss's apochromatic 

 series of objectives, 371 



of objective, 390 



relation of, to power, 82, 83, 363 ; as- 

 certained by vertical illumination, 338 



table, Royston-Pigott's, 30 



numerical, table of, 84-87 

 Apertures, relative, 49 

 Aphanizomenon, 548 

 Aphanocapsa, 547 



Aphides, wings of, 998, 999 ; agamic re- 

 production in, 1006 

 Aphodius, antennae of, 988 

 Apidce, 987 



Apis mellifica, mouth-parts of, 990 

 Aplanatic system, 20, 23 



objective use of, 21 



cone, 307 



aperture, 309, 315 



foci, Lister's discovery, 355 

 Apochromatic objectives, 19, 30, 33, 



35, 80, 258 ; advantages of, 33, 34 ; 

 objective, Zeiss's, 365-371 ; dry, 368 ; 

 comparison of, with chromatic and 

 achromatic lenses, 368 ; homogeneous 

 objectives, value of, in study of 

 monads, 762; objective, use with 

 various test scales, 976 



condenser, Powell and Lealand's, 302 

 Apochromatism, 366, 369 

 Apocynacecv, laticiferous tissue of, 



695 



Apogamy in ferns, 680 

 Apospory in ferns, 680 

 Apotheces of lichens, 650, 651 

 Apparent creation of structure, 68 

 Appendicularia, 911, 917; pharyngeal 



sac of, 917 ; tail of, 917 ; cotochord, 918 ; 



1 Haus ' of, 918 



Apple, raphides in bark of, 696 

 Apposition, growth by, 533 



mode of growth of starch, 695 

 Apus, 959, 962 ; parthenogenesis of, 964 



note 



cancriformis, carapace of, 962 



4 2 



