INDEX. 
953 
Objective, Zeiss’s New Microscope, 107. 
Objectives, 255. 
, Apochromatic, Spherical Aberration, 
552. 
, Fluorite in Apochromatic, 416, 670. 
— — * Fluor-spar, 260. 
- — — , Magnifying Power of, .545. 
, New Arrangement for quick Change 
of, 547. 
, Paper for Cleaning, 548. 
— — , Spencer and Smith’s new, 545. 
Ochlochsete, 649. 
Ocnerodrilus, Anatomy of, 368. 
Oculars, Paper for Cleaning, 548. 
Ocypode Crab, Bed, Stridulating Apparatus 
of, 786* 
Oehlert, D. P., Brachiopoda of the ‘ Tra- 
vailleur ’ and ‘ Talisman ’ Expeditions, 
354. 
Oerstedia , Eyeless Species, 209. 
CEstridse, African, 600. 
, American, with Larva living on 
Human Skin, 780. 
, Passive Stage in Development, 358. 
Ogagne, — d’, Geometrical Representa- 
tion of Formula for Lenses* 683. 
Ogata, M., Apparatus for Cultivating 
Anaerobic Bacteria, 691. 
, Claim of Priority in connection with 
Immunity Question, 252. 
Ogmannikow, J., Arsonval’s Thermostat 
modified for Benzin Heating* 108. 
Ohlmuller, — .* Effect of Ozone on 
Bacteria, 842. 
OidiUm lactis, Differences between O. 
albicans and, 833. 
Oil as Reserve-material in Trees, 58. 
decomposing Ferment in Plants, 
225. 
of Anise-seed as an Imbedding 
Medium for Freezing Microtome, 706. 
— ■ — , Removing from Whetstones, 706. 
Oka, A., New Genus of Synascidians, 
197. 
, Periodic Regeneration of Upper 
Half of Body in Diplosomidse, 467. 
Okada, K., Bacillus rubellus , 251. 
Oligochseta, Aquatic, 206. 
Oligochsete, New Branchiate, 367. 
, New Genera of Aquatic, 368. 
, New Genus, 612. 
Oligochsetous Worms, Aquatic, 789. 
Olive Disease, 244. 
Oltmanns, F., Life of Marine Algae, 396. 
, Photometric Movements of Plants* 
513. 
Onclinesoma Steenstrupii, 207. 
Oniscus murarius , Development* 364. 
Oocystis elliptica sp. n., 736. 
Oogenesis in Cyclops and Canthocamptus, 
788. 
in Diaptomus , 607. 
in Echinoderms, 375. 
1892. 
Ooliths, Formation of, 839. 
“ Oolysis” in Seps, 343. 
Ophioglossaceae, Sporophyte of* 517. 
Ophioglossum, 395, 518. 
Ophiuroids, Classification, 620. 
Opisthobranchs, Alleged Anal Eye of 
Larval, 770. 
Oppel, A., Fertilization of Ovttm of Slow- 
worm, 343. 
, Fertilization of Reptilian Ova, 456. 
Optic Lobes of Chick, Structure of, 765. 
Optics, Microscopical. See Contents, 
xxxviii. 
Oral Appendages of Thysanura and Col- 
lembola, 781. 
Orchestiidae, Antennary Gland, 365. 
Orchidaceae, Alkaloids of, 498. 
, Mucilage-cells of, 60. 
Organism, Living, 766. 
Organogeny of Amphiura squamata, 796* 
Orkney, Entomostraca from, 478. 
Orthoptera, Digestive Canal, 201. 
Ortloff, F., Stem-leaves of Sphagnum , 
519. 
Ortmann, A., East African Coral Reefs, 
490. 
Osborne, T. B., Proteids of Maize, 381. 
, Proteids of Oat, 58, 809. 
Oscillariacese, 838. 
Osmond, W. M., 444. 
Osmotic Experiments on Living Bacteria* 
87. 
Osmunda, Prothallium and Embryo of, 517. 
Osmundaceae, Petiole of, 237. 
Ostracoblabe implexa , 242. 
Othelosoma Symondsii, 40. 
Otto, R., Direct Assimilation of Nitrogen, 
70. 
Ova, Frog, Alleged Parthenogenesis, 589. 
, , Gelatinous Sheath round, 343. 
of Trematoda, Vitelline Nucleus in, 
618. 
, Reptilian, Fertilization of, 456. 
, Selachian, Polyspermy in, 459. 
, Teleostean, Examination of, 699. 
* , Preservation of, 883. 
, Trout, Maturation and Fertilization* 
344. 
Ovarian Ova of Selachii, 459. 
Ovens, New Method for Ascertaining Tem- 
perature of Sterilizing, 693. 
Overbeck, A., Production of Fat Pigment 
(Lipochrome) by Bacteria, 662. 
Oviduct of Frog, Development* 187, 285. 
Oviparity of Peripatus Leucharti, 37, 600. 
Oviposition in Cattle Tick, 446, 449, 574. 
Ovule of Pinus, Two Endosperms in, 820. 
of Trapa , 384. 
of Vincetoxicum, 508. 
Ovules, Dorsal Position in Angiosperms, 
503. 
, Mode of Obtaining Sections, 437. 
Ovum, Cleavage in Cephalopods, 21* 
3 s 
