998 



INDEX. 



Ocnerodrilus, a new Genus of OUgo- 

 chseta, 44. 



fficistes Janus and Floscularia trifo- 

 lium, two new Species of Rotifers, 1. 



Oil, Glass, &c., Increase of Radiation 

 in, 343. 



Oil-immersion Objectives. See Homo- 

 geneous Imnieirion. 



Olf.ictory Organs and Nervous System 

 of the Molhisca, 583. 



Organ of Terrestrial Pulmonate 



Gastropoda, 24. 



of Insects, 33 



"Olfactory Tubercle" of Simple As- 

 cidians, 726. 



Oligoehseta, Ocnerodrilus a new Genus 

 of, 44. 



Olpidiopsis, the Parasite of Saprolegnia, 

 87. 



Onchidium, Digestive, Nervous, and 

 Reproductive Organs of, 230. 



" Lung " of, 229. 



" Opaque " Illumination by the Verti- 

 cal Illuminator, 3G2, 373. 



Opaque Illuminator, Tolles', for High 

 Powers, 149. 



■ Mountings, Apertures in, 540. 



Objects, Mounting, 847. 



, Mounting with Beeswax. 705. 



, Wax for Dry-mounting, 53G. 



Ophiurans, Deep-sea, Structural feature 

 hitherto mikiiown among Echino- 

 derniata, found in, 254. 



Ophiuridse and Astrophytidse, Pre- 

 liminary List of the known Genera 

 and Species of Living, 467. 



Ophiuroidea, Circulatory and Respira- 

 tory Organs of, 466. 



, Nervous System of, 606. 



Optic Nerve, Spinal Root of, 18. 



Orbitoides and Cycloclypeus, 68. 



Orchis maculata. Embryology of, 261. 



Organic " Dusts " of the Atmosphere, 

 89. 



Organized Poisons, Mitigation and Re- 

 newed Activity of, 498. 



Origin of Homogeneous Immersion, 131. 



Ortliodontium, Structure of, 82. 



Orthonectida, Observations on, 4FI. 



Orthoscopic and P.seudoscopic Effects 

 in the Binocular Microscope, Condi- 

 tions of, 203. 



Orthotrichum, Structure of, 80. 



Osmic Acid, Concentrated Action of, on 

 Bone-cells, 960. 



Ossicles, Auditory, of Mammals, 18. 



Ostreiculture, Enemies of, 587. 



Ova of Eudendrium, Development of, 

 250. 



, Formation of, 470. 



Ovary, Mammalian, Structure of, 576. 



Ovule, Morphology of, 260. 



Ovum of the Crustacea, Polar Globules 



in, 42. 



of the Hydroida, Origin of, 746. 



Oxygen, Reagent for small quantities 



of, from Living Organisms, 962. 

 Ozone Action of, on Germs contained 



in the Air, 781. 



Palisade-tissue, Modification of, 70. 



Palmellacese, Hauckia a new Genus of, 

 503. 



Paltosoma torrentium, a Fly with Di- 

 morphous Female, 36. 



Paludina vivipara. Pedal Nervous 

 System of, 27. 



Paludinida3, Development of, 27. 



Paracholesterin, 918. 



Paraffin, Imbedding in, 954. 



, Imbedding in, and Freeing the 



Sections, 953. 



Parasite (Fungus) of the Sycamore, 

 638. 



of Fir-bark, Nectria cucurbitula, 



84. 



of Larch, Peziza Willkommi, 85. 



• of Maple, Cercospora acerina, 84. 



of Saprolegnia, Olpidiopsis, 87. 



Parasites, Fungus-, of Coniferae, 281. 



on Tobacco, 86. 



Parasitic Crustacean, new type of, 

 242. 



on Fish, 456. 



Fungi, Blodgettia, a new Genus 



of, 491. 



on Plants, Germ-theorv ap- 

 plied to, 283. 



Hysterium on Cruciferse, 282. 



Infusoria in Cephalopods, 902. 



Nematoid in a Bat, 46. 



Protozoa, especially those of Man, 



764. 



in Man and the Diseases to 



which they give rise, 760. 



Parasitism of Chlorochytrium, 931. 



— — of Elaphomyces granulatus, 86. 



Parenchyma, Assimilating, Influence 

 of the Intensity of Light on the 

 Chlorophyll in, 271. 



Parenchymatous Cells and Secretion 

 Receptacles of the Higher Monocoty- 

 ledons, Cell-nucleus in, 265. 



Paris, SpirogjTas of the Environs of, 

 504. 



Parkes's Child's Portable Compound 

 Microscope, 655. 



Parrots, Development of, 217, 575. 



Pathogenous Fungi in the Animal 

 Organism, 278. 



Pecten, Eye ot; 230. 



Peculiarities in Marine Animals, 582. 



