1004 



INDEX. 



Objectives, Measurement of Angle of 

 Aperture of, Note on Mr. Wenham's 

 Paper on, 270.) 



, Microscope, on Stephenson's 



System of Homogeneous Immersion 

 for, 256. 



, Oil-Immersion, 331. 



, Oil-Immersion, and the Aper- 



tometer, 140. 



, Wide-angled, "Penetration" of, 



322. 



Objects, Contrivance for Holding be- 

 neath the Stuge, 466, 624. 



Oblique Illumination, 473. 



Illuminator, Woodward's, 769. 



Octopus, Blood of, Hgemoc3'anin in, 164. 



, Chromatic Function in, 165. 



, Habits of, 854. 



, Structure and Physiology of, 402. 



Odoriferous Cells in Lepidoptera, 298. 



fficistes umbella, and other Rotifers, 1. 



Qidogouiacese, American, 935. 



Oidium albicans and Mycoderma vini. 

 Relationship of, 453. 



Oil-Immersion Objectives, 331. 



Objectives and the Aperto- 



meter, 140. 



Oils for Homngeueous-Immersion Ob- 

 jectives, Mixture of, 332. 



Olfactory Nerve and Olfactory Organ 

 of Vertebrates, Development of, 547. 



01igocha3ta, Further Studies on, 729. 



Onion-smut, Urocystis Cepulaa, 921. 



Opaliuid, New, from Intestine of Anou- 

 rous Batrachia, Haptophrya gi- 

 gantea, 588. 



Ophiurida, Anatomy of, 737. 



Optical Characters of Minerals, Further 

 Improvements in Studying, 326. 



Instruments, Measurement of the 



Amplificatiou of, 184. 



Optic Axes of Crystals, Apparatus for 

 Determining the Angle of, with the 

 Microscope, 191. 



Nerve Fibres and Ganglion-cells 



of the Mammalian Retina, Isolation 

 of, 614. 



Orang-Outang, Ascaris of, 729. 



Orchi'lla as a Staining Material, 59. 



Ord, W. M., on some Causes of 

 Brownian Movements, 656. 



Organogenic Researches on the Cap- 

 sule of Mosses, &c., 159. 



Oribatulse, British Acari, 76. 



, a Contribution to the Know- 

 ledge of, 225. 



Orientation, Exact, of Nicols in Polariz- 

 ing Apparatus, 74. 



Orthonectida, Organization and Classi- 

 fication of, 886. 



Oscillatorieaa and Diatoms, Movements 

 of, 182. 



Osmic Aciil, on some Applications of, 

 to Micnscupic Purposes, 381. 



and Chromic Acid.s, Employment 



of Mixtures of, for Histological Pur- 

 poses, 144. 



Ova, Development of, in Man and other 

 Mammalia, 845. 



Ovary and Corpus Luteum, 698. 



, Structure of, in Man and other 



Mammalia, 845. 



Ovisacs, Formation of, in Copepoda, 85. 



Ovule, Axial or Foliar Structure ? 594. 



, the, 49. 



Ovum, Animal, Formation, Fructiiica- 

 tion, and Division of, 274. 



, Granular Bodies found in, 845. 



, Segmentation of, in Helix aspersa, 



40.5, 854. 



Oxytrichina, Morphology of the, 91. 



Oxyurids, Oiganization and Develop- 

 ment of. 289. 



Pairing of Spiders, 870. 



Palmella cruenta, Palmelline, the 



Colouring-matter of, 938. 

 Palmelline, the Colouring-matter of 



Palmella cruenta, 938. 

 Paraboloid as an Illuminator for tlie 



Microscope, Formation of, 620. 

 Parasites, " Digger " Mollusc and its, 



303. 



of the Lamellibranchiata, 285. 



, Phanerogamic, Nutrition of, 444. 



, Vine, two new, 601. 



Parasitic Acarina found in the Cellular 



Tissues and Air-sacs of Birds, 415. 



AlgiB, New, 606, 938, 939. 



Ascaris in the Lion, 729. 



in the Orang-Outang, 729. 



Chylfti.la}, 418. 



Crustacea, 61. 



, Fungi, on Fungi, 926. 



, on the Cabbage, 315. 



Insects, 558. 



Phycomycete, New, 599. 



Species of Cryptogams, Entophytic 



and Entozoic, 448. 

 Parasitism amongst Infusoria, 94. 



of a Coral on a Sponge, 96. 



of Lichens on Mosses, 930. 



of Notommata on Vaucberia, 291. 



of Notommata Werneckii in the 



Tubes of Vaucheria, 530. 

 Paris Exhibition, Microscojiy at, 72. 

 Parker, T. J., on some Applications of 



Osmic Acid to Microscopic Purposes, 



381. 

 Parthenogenesis in Bees, 88, 143, 297. 

 , the Relation to it of Polyem- 



bryony, true and false, 444. 



