1164 



INDEX 



NAC 



N 



Nachet, on ' immersion system,' 27 ; his 

 binocular, 97, 98, 99 ; his changing 

 nose-piece, 293 



Nacreous layer in molluscan shells, 919, 

 922, 924 



Naegeli and Schwendener, on microscopi- 

 cal optics, 67 



Nageli's theory of formation of starch, 

 695 



Nails, 1029, 1033 



Nais, 955 



Naphthalin, 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 ; 

 zobzygospores of, 597 



bifrons, presumed relation to Suri- 

 rella microcora, 602 note 



in chalk, 1087 



lyra, as test for definition, 426 



rhomboides, 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, 878 



Nelson, on the sub-stage condenser, 72 

 note ; on 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 micro- 

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

 277 ; his plan for estimating edges of 

 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 



Nemalion multifidum, 631 



Nematodes, desiccation of, 945 



Nematoid worms, 944 



Nemertine larva, 951 



Nepa, tracheal system, 995 ; wings of, 

 1000 



ranatra, eggs of, 1005 

 Nepenthes, spiral fibre-cells of, 698 

 Nereides, 948 



Nereocystis, 627 



NUC 



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 striae, 381 



Nicotiana, seeds of, 724 



' Nidamentum ' of Gastropoda, 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 

 Nitzschiece, 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 Lealand'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 bombycis, 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 



Notonecta, 987 ; wings of, 1000 

 Nucellus, 685 

 Nuclear stains, 491-494 



spindle, 538 ; plate, 538 

 Nuclein, 537 



Nucleoli, 534 

 Nucleoplasm, 537 



