u66 



INDEX 



oos 



Oiispores, 540; of Volvox, 556; of Vau- 

 cJ/eria, 563; of Achli/a, 565; of 

 Kphceroplea, 572 ; of CEcLogonium, 573 ; 

 of Chara, 579; of Fticaceee, 628 



Ooze, Globigerinq, organisms in, 811, 

 813, 820 ; compared with chalk, 1085 



Opalescent mirror as a substitute for 

 polarising prism, 194 



[Ml in n, 774 



Opaque illumination by side reflector, 333 



- mounts, 336 



' Open ' bundles, 710 



OpercitUna, 830 ; and Nummulites com- 

 pared, 834 



Opercule of mosses, 671 



OjiJiiai-antl/a ricij/ara, development of, 

 900 note 



Ophioglossaceee, development of pro- 

 thallium of, 679 



Ophioglossum, sporanges of, 676 



OphiotTvrix pentaphyllum, spines of, 

 891 ; teeth of, 892 



OpJiiitrida, mounting, 481 



OpJiin raided, skeleton of, 891 ; spines of, 

 891 ; teeth of, 892 ; larva of, 898 ; 

 direct development in, 900 note 



Ophrydia, quantities of, 777 



OijJiri/diuni, cellulose in zoocytium of, 778 



- versatile, effect of light on, 775 

 OpTvryodendron, 784 



Opium poppy, latex of, 695 



Optic axis of Powell and Lealand's No. 1, 



194 

 Optical anomalies in petrology, 1078 



centre, 24 



- tube-length of microscope, 158, 159 

 Orals of Anted on, 901 

 Orbiculina, 803, 804, 808 



compared with Heterosteginu, 834 

 Orbitoid.es, 835 



- and Cycloclypeus compared, 835 



- Fortisii, 836 

 Orlitolina, 824 



Orbitolince, occurring with flint instru- 

 ments, 824 

 Orbitolites, 804-810 



shell of, 798 ; range of variation in, 

 810 ; structure of Parkena resembling, 

 817 ; deposits of, 1085 



and GycloClijpeus compared, SOI 



coni/iln initii, animal of, 807-80'.' 



italincn, 800 note, 808 

 ti'it /linn/ma, 808 



Orbiilina, 820 



Orbuline shell, sandy isomorph of, 815 



< )rr///</t'n", pollinium of, 722 



Orchids, mycropyle of, 723 



O/rA/.v, pollen-tubes of, 72:5 ; seeds of, 

 724 



Organised structure and living action, 

 580 



< (rgans, .".:!:; 



Organs df sense' in ('iJiata, 775 note 



nrilxit i<l<r, nyni|ih of, 1009; mouth-parts 

 of, KM ill; legs of , KH(l; int.'guinent of, 

 1010; auditory organ, loll ; reprodnc- 

 ti\i UI-'JMII .. lull; siipi'i-roxal glands 



PAL 



of, 1011 ; tracheae of, 1011 ; characters 



of, 1012 

 Orienting small objects for sectionisiiig, 



499 



Orie/aniimonites, seeds of, 724 

 Ornithorhynchus, hair of, 1031 

 Orobanche, seeds of, 724 

 Ortlwptera, eyes of, 987 ; antenna; of, 



988; wings of, 999 ; nymph of, 1009 

 Orthoscopic effect, 95 ; with Ramsden's 



circles, 106 



eye-piece, 376 



Ortlwsira Dickiei, sporangial frustule 



of, 595 



Oscillator/a, movement of, 547 

 Oscillatoriacece, 547 



movements of, 433 

 Oscula of sponges, 856 



Osmic acid and fatty structures, 517 

 Osmunda, sporanges of, 676 



- regalis, prothallium of, 679 note 

 Ossein, of bone, 1023 



Ostiole of conceptacle of corallines, 032 



Ostioles of Naviculacece, 590; of Cym- 

 belleee, 590 



Ostracoda, 960 



Ostreacece, shell of, 923 



Ostrich, egg-shell of, 1101 



Otoliths compared with artificial concre- 

 tions, 1100 



- of Molliisca, 941 

 Ovarium of Polyzoa, 907 

 Over-amplification, 88 

 Over-corrected objective, 20 

 Over-correction, 358-360 

 Overtoil, on Volvox, 556 note 

 Ovipositor of Oribatidce, 1012 

 Ovipositors of insects, 1002-1004 

 Ovule of Phanerogams, 684 



suspensor of, 534 



structure of, 684-685 ; development of, 

 722 



Ovum of Hydra, 86(5 



Oxytricha, a phase in development of 



Trichoda, 780 

 Oxyuris vermicularis, 944 

 Oysters, shell of, 923 



Pacinian corpuscles, 1053 

 Palaeontology, use of microscope in, 1083 

 ' Palate ' of Gastropoda, 919, 930 ; classi- 



ricatory value of, 932 ; preparation of, 



9:>2 ; viewed with polariscope, 933 ; 



bibliography, 933 

 Palese of grasses, silex in, 715 

 Palisade-parenchyma of leaves, 716 

 Palm, stem of, 701 

 Palmclla, as gonid of lichen, 651 

 crttentfi, 5 5s 



Piihiicllacece, 557 ; frond of, 558 

 Palmodictyon, 559; zoiispores of, 559 

 Pahnoghea wacrococca, life-history of, 



541, 542 

 Palpicornia, antennas of, 9ss 



