INDEX 



1139 



ANA 



Analysis, micro-chemical, 1102 ; method 



of, 1102 



A/iartijihidete, 599 

 Anchor-like plates of Synapta, 895 

 Andalusite, 1077 

 Androspore of (Edogonium, 572 

 Anemones, 803. See ACTIXOZOA 

 Anemophilous flowers, 722 

 Anetlmm 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 

 Angnillnla acefi, 945 



fiuviatilis, 945 



glutinis, 1)45 

 Anguillulce, 045 

 Angular aperture, 395 



of dry objective, 391 ; of oil immer- 

 sion, 391 

 - of aperture, resolution dependent 



on, 44 



- of water immersion, 391 

 Angular distribution of rays, 56 ; grip, 



61 ; semi-aperture, 77 

 An-gitliferce, characters of, 613 

 Animal kingdom, two divisions of, 727 

 Animalcule cage, 346 

 Animalcules, 753. See ROTIFERA, Infu- 

 soria, RHIZOPODA, &c. 

 Animals and plants, differences between, 



530 



Anisochelse of sponges, 860 

 Anisoneina, 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 



Amiulus of sporange of fern, 676 



A notion, pearls in, 923; gloclu'dia of, 

 933 ; for observation of ciliary motion, 

 940 



Anomia, prismatic layer in, 924 



Aiuiphi (Nemertines), 951 



Anoplophrya circidans, 774 



Anorthite, 1080 



Antedon, food of, 771; pentacrinoid 

 larva of, 900-902 ; pseudembryo of, 903 



Antennas of insects, 987; preparation of, 

 988, 989 note 



Antherid of Vaucheria, 563; of Churn, 

 577, 578; of Fncacece, 627, 628; of 

 Fl<-itlt'<<-, (531 ; of Peronosporeee, 638 ; 

 of Marclitiiitiu, 6(55, 6(57 ; of mosses, 

 (570 ; of Spnagnacece, 673 ; of ferns, 

 677 ; tapetal cells in, 678 



APU 



Antherozoids, 536, 540; of Volvox, 555; 

 of Vaucheria, 563; of Sphceroplea, 

 572; of (Edogonium, 572; of Batrti- 

 chospermum, 574; of Chnra, 579; of 

 PhcEosporece, 627; of Fucacece, 628; 

 of ferns, 678; of Rhizocarpece, 681 



Anthers, 719 



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

 proboscis, 990 note 



A nthopli t/sa , 765 



Antirrhinum umjus, 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, 3(53 ; as- 

 certained by vertical illumination, 338 



- table, Royston-Pigott's, 30 



- numerical, table of, 84-87 

 Apertures, relative, 49 

 Aphanizomenon, 548 

 Aphanocapsa, 547 



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



production in, 1006 

 Aphodius, antennas of, '.is* 

 Apida, 987 



Apia meUijicn, 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, 3(5* ; 

 comparison of, with chromatic and 

 achromatic lenses, 368 ; homogeneous 

 objectives, value of, in study of 

 monads, 762 ; objective, use with 

 various test scales, 97(5 



condenser, Powell and Lealand's, 302 

 Apochromatism, 366, 369 



laticiferous tissue of 

 695 



Apogamy in ferns, 680 

 Apospory in ferns, 680 

 Apotheces of lichens, 650, 651 

 Apparent creation of structure, 6S 

 Ajijii'inlii-ularia, 911, 917; pharyngeal 

 sac of, 917 ; tail of, 917 ; notochord, 918 ; 

 'Hans' of, 018 



Apple, raphides in bark of, 696 

 Apposition, growth by, 533 

 - mode of growth of starch, 695 

 Apus, 959, 962; parthenogenesis of, 964 

 note 

 i-ii ncrifortnis, carapace of, 9(52 



4 D 2 



