1164 



INDEX 



NAG 



N 



Nachet, on ' immersion system,' 27 ; his 

 binocular, 97, 98, 99 ; his changing 

 nose-piece, 293 



Nacreous layer in molluscaii shells, 919, 

 922, 924 



Naegeli and Schwendener, on microscopi- 

 cal optics, 67 



Niigeli's theory of formation of starch, 

 695 



Nails, 1029, 1033 



Nais, 955 



Naphthaliii, monobromide of, as a mount- 

 ing medium, 521 ; refractive index of, 

 521 



Narcissus, spiral cells of pollen-chambers 

 in, 720 



Nassula, mouth of, 774 



Nauplius, compared with Pedalionidce, 

 792 



Nautiloid shell of Foraminifera, 797 



Nautilus, 929 



Navicula, 590, 597, 617 ; markings on, 

 593 ; cysts of, 597 ; zygospores of, 597 ; 

 zoiJzygospores of, 597 



- bifrons, presumed relation to Stiri- 

 rella microcora, 602 note 



- in chalk, 1087 



- li/>'(i, as test for definition, 426 



- rJtoniboides, markings on, 592 ; as test 

 for definition, 426 



Naviculece, frustule of, 589 ; ostioles in, 



590 



characters of, 616 

 Nebalia, carapace of, 962 

 Needles for dissection, their mode of use, 



457 

 Negative aberration, 27, 360 note 



- crystals, 1074 



- eye-pieces, 376, 377, 378 



Nelson, on the sub-stage condenser, 72 

 note ', 011 ghostly diffraction images, 72 

 note', his model, with Swift's fine- 

 adjustment screw, 172 ; his horse-shoe 

 stage, 179, 228; his fine adjustment to 

 the sub-stage, 185 ; his screw micro- 

 meter eye-piece, 271 ; his new mici'o- 

 meter eye-piece, 272 ; his ' black dot,' 

 277; his plan for estimating edgt's ..t 

 minute objects, 277 ; his changing nose- 

 piece, 294 ; his revolving nose-piece, 

 295 ; on rings and brushes, 319, 320; 

 his means of obtaining monochromatic 

 illumination, 323 ; his lamp, 404 



Nelson and Karop, on fine structure of 

 diatoms, 591 note 



\'i-iiintii>ii multifidum, 631 



NYnmtodes, desiccation of, 945 



Nematoid worms, 944 



Ni-incrtino lar ,a, '.)."> 1 



Nepii, tracheal system, it 95 ; wings of, 

 1000 



- I'll Illl t I'll, C.L'gS of, 100.") 



Nept'iit In ^, spiral fibre-cells of, f'.'.ts 

 \, i-fidce, 948 

 Ncreocystis, 627 



NTJC 



Nerve-cells, 1051 



Nerve-fibres, 1052 



Nerve-substance, 1051 ; mode of prepara- 

 tion, 1054 



Nerve-tubes, 1051 



Nervures of wing of Agrion, 994 



Nettle, hairs of, 714 



Neuroptera, 973; eyes of, 987; circula- 

 tion in wings of pupa, 994 ; wings of, 

 998 



Newt, red blood-corpuscles of, 1034 ; cir- 

 culation in gills of larva, 1057 



Newton's reflecting microscope, 132 

 - suggestion of reflecting microscope, 

 145 



- rings, 1097 

 Nicol prisms, 318 



Nicol's analysing prism, 294 ; for resolv- 

 ing striie, 381 



Nicotiana, seeds of, 724 



' Nidameiitum ' of Gastrojioila, 934 



Nitella, 576 



Nitric acid as a test for albuminous sub- 

 stances, 517 



Nitrogenous substances, test for, 517 



Nitzschia, 602 



scalaris, cyclosis in, 587 



sigmoidea, 606 

 XitzscliiecE, 606 



Noctiluca, collecting, 529 ; tentacle 

 (flagellum) of, 766, 768 ; cilium of, 766 

 note ; protoplasmic network of, 767 ; 

 reproduction of, 769 



- miliaris, 765-769 

 Noctuina, antennae of, 988 

 Nodes of monocotyledons, 701 

 Nodosaria, 819 

 Nodosarince, shell of, 797 

 Nodosarine shell, sandy isomorphs of, 



815 

 Nonionina, 829 



- shell of, 797, 798 



Nonionine shell, sandy isomorph of, 814 

 Non-stereoscopic binoculars, 105 

 Non-striated muscle, 1048, 1050 

 Nose-pieces, 291-295 ; centring, used as 

 sub-stage, 228; Brooke's, 291; Beck's 

 rotating, 291 ; Powell and Lealaiid's, 

 291 ; Watson's dustproof, 292 ; Zeiss's 

 calotte, 292; centring, 293; Nachet's 

 changing, 293 ; analysing, 294 ; Vogan's, 

 294 ; Nelson's revolving, 295 

 Nosema boibi/cis, cause of pebrine, 661 

 Nostoc, 548, 549; as gonid of lichen, 

 651 ; resemblance of Ophrydium to, 

 778 

 Nostocacece, 548 ; affinities with Bacteria 



and Myxomycetes, 652 

 Notochord in Tunicata, 911; of Appen- 



dicularia, 918 



Notouecta, 987 ; wings of, 1000 

 Nucellus, 685 

 Nuclear stains, 491-494 



- spindle, 538 ; plate, 538 

 Nuclein, 537 



Nucleoli, 534 

 Nucleoplasm, 537 



