INDEX 



1165 



NUC 



DOS 



Nucleus, 534 



action of acetic acid on, 517 ; its im- 

 portance to cell, 535 ; division of, 538 ; 

 fragmentation of, 538 ; presumed ab- 

 sence of, in some forms, 727 ; initiative 

 action in monads, 762 



and cell division, 1019 note 

 Nucule of Chara, 577, 579 

 Nudibranchs, nidamentuni of, 934 ; em- 

 bryos of, 936 



Numerical aperture, 29, 53, 60, 390, 

 425 ; formula for, 390 ; problems on, 

 391 



of dry objective, 391 ; of water- 

 immersion, 391 ; of oil-immersion, 391 

 and resolving power of objective, 

 393 



apertures, table of, 84-87 

 Nummulme layer of Eozoon, 840 



- plan of growth, Parker and Rupert 

 Jones on, 827 note 



Xi!>/intlini(lff, H2(> 

 XHimwidites, 826, 827, 831 



- dint (t us, 832 



garansensis, .s:;2 



Icevigatct, 832 



- striata, internal cast of, 834 



- tubuli in shell of, 800 

 Nummulitic limestone, 831, 835, 1085, 



1090 

 Xii/i/uu- lutea, parenchyme, 687 ; stellate 



cells of, 687 

 Nymph of Acarina, 1009 ; of Oribatidte, 



1009 



O 



Oak, size of ducts in, 699 

 - galls, 1003 



Oberhiiuser's spiral fine adjustment, 153 



Object-glass of compound microscope, 

 36, 39 ; of long focus, 40 ; of short 

 focus, 40 ; capacity of, 382 



Object-glasses, power of, 44 



- testing, 381 ; Abbe's method of 

 testing, 384-387 : diaphragms for use 

 in testing, 385 ; Fripp's method of 

 testing, 386 



Object-holder for Thorna's (Jung's) mi- 

 crotome, 464, 465, 466 



changer, Zeiss's, 293 



Objectives, achromatic, 19, 32 ; aplanatic, 

 19 ; apochroniatic, 19, 30, 34, 80 ; cor- 

 rected, 20, 21 ; immersion, 28, 34, 58 ; 

 aperture of, 43, 65, 390 ; maximum 

 aperture of, 44 ; comparison of, 46 ; 

 illuminating power of, 54 note ; im- 

 mersion v. dry, 54, 79 ; dry, with balsam 

 mounted objects, 55 ; dry, 58 ; dry, for 

 study of -life-histories, 81 ; penetrating 

 power of, 83, 393 ; sliding plate with, 

 290; rotating disc with, 290; of wide 

 aperture, 369 ; of small aperture, ex- 

 amiiiation of, 388 ; tests for, 388, 394 ; 

 resolving power of, and numerical aper- 

 ture, 393 



Objectives, triple-back, 361 ; Wenham's 

 single front, 361; duplex front, 362; 

 Leitz's, 374; Reichert's, 374; adjust- 

 ing, 357, 360 



- achromatic, Martin's, 147 ; Marzoli's, 

 353; Tully's, 354; Selligue's, 354; 

 Amici's, 355 ; Ross's, 356, 360 ; Powell's, 

 356, 361 ; Smith's, 356, 360 ; Wenham's, 

 361 ; covers for use with, 439 



- apochroniatic, 366, 370, 371-375 



- homogeneous immersion, introduction 

 of, 364 



- ' semi-apochromatic,' 35, 374, 375 



oil-immersion, Powell and Lealand's, 

 30; Amici's, 364; Tolles', 364; 

 Zeiss's, 370 ; Leitz's, 374 ; Reichert's, 

 374 ; Swift's, 375 ; Beck's, 375 ; 

 Bausch and Lomb's, 375 ; "Watson's, 

 375 



water-immersion, Powell and Lea- 

 land's, 362, 365 ; Prazmowski and Hart- 

 nack's, 362 ; Zeiss's, 370 



Oblique illumination, 190, 191, 387 



illuminator, 190 



Obliteration of structure by diaphragms, 

 68 



Occhiale, Galileo's, 122, 123 



Occhialino, Galileo's, 121, 124 



Oceanic sediments, microscopic examina- 

 tion of, 1092 



Ocelli of planarians, 947 ; of insects, 982, 

 986 



Ocellites of compound eye, 982 



Ocular, 40, 375 ; spectral, 327 



GEdogoniacece, 572 



(Edogonium ciliatum, 573 



(Enothera, pollen-grain, 721; emission 

 of pollen-tubes of, 722 ; embryo of, 723 



Oil for immersion lenses, suggested by 

 Aniici, 29 



- of cedar-wood, for immersion objec- 

 tives, 29 



Oil-globules, 429-431 



Oil-immersion, 29 



- objectives. See Objectives, oil- 

 imniersion 



Oils, solvents for, 517 



Okeden, on isolation of diatoms, 624 

 note 



Oleander, epiderni of, 714; stoinates of, 

 716 



Oliviiie, corroded crystals of, 1072 



Oitchiditnn, eyes of, 941 



Oncidium, spiral cells of, 69:! 



Onion, raphides of, 696 



Oijgones of Vaucheria, 563; of SpJ/i* ro 

 plea, 572; of CEdogonium, 572; of 

 Chara, 577; of Fucacece, 627, 628; of 

 Peronosporece, 638 



Oolitic grains, 1084 



Oiiphyte in ferns, 680 



Oospheres, use of the term, 537 note ; of 

 Volvox, 556; of Vaiiclieria, 563; of 

 Splia -fn/i/, -a, 570; of (Edogo)iitim,~)~i-l: 

 of Cham, 577; of Plueosporece, 627 : 

 of Fucacece, 628 ; of Marchantia, 668 ; 

 of ferns, 679 



