INDEX 



H57 



K'E 



' Ice-plant,' epiderm of, 714 

 Ichneumonidce, ovipositor of, 1003 

 Illuminating power, 425 



- power of objectives, 54; compared 

 with penetrating power, 393 



Illumination for dissection, 401 



- for opaque objects, 149 



- oblique, 190, 191, 388 



of objects, Ross on, 300 ; monochro- 

 matic, 321-323 ; Gifford's screen for, 

 321 ; Meithe's filter for, 322 ; Nelson's 

 apparatus for, 323 ; by reflection, 329- 

 338 ; opaque, 329 ; from the open sky, 

 412; by diffused daylight, 412; for 

 dark ground, 413 ; experiments in, 414 ; 

 monochromatic, means of obtaining, 

 417, 418 ; annular, 419 ; colour, 423 ; 

 double, objects for study with, 423 ; 

 with small cones, as cause of errors in 

 interpretation, 427 



Illuminator, oblique, 190 ; white cloud, 

 194; parabolic, 316-317; Swift's sub- 

 stage, 319; Smith's vertical, 336; 

 Powell and Lealand's, 337; Beck's, 

 337 ; for examination of metals, 337 



Image, real, 14 note ; virtual, 14 note, 376 ; 

 conjugate, 24; inverted conjugate, 24; 

 absorption or dioptrical, 64 ; diffrac- 

 tion, 64 ; negative, 64 ; positive, 64 ; 

 solid, 95 ; real object, 375 ; definition 

 of, 382 ; formed by compound eye, 984, 

 985 



Images, by diffraction, dioptric and 

 interference, 72 



Imaginal discs in larva of blowfly, 1007 



Imbedding processes, 495-506 ; paper 

 trays for, 497 ; in paraffin, metal case 

 for, 498 ; orienting bottle for, 499 



- paraffin method, 409-503 ; in gum, 

 475, 505, 506 ; celloidin method, 503- 

 505 



- by coagulation or freezing, 505, 506 

 Immersion lenses and vertical illumina- 

 tors, 337, 338 



- homogeneous, outcome of Abbe's 

 theory of diffraction, 364 



water, Zeiss's, 370 



- Amici's, 362 ; Powell and Lea- 

 land's, 362, 364 ; Prazmowski and Hart- 

 nack's, 362; Tolles', 362 



- objectives, 28 ; examination of, 387 



- system, 27-29 ; invented by Amici, 

 27 



Imperfect achromatism, cause of yellow- 

 ness, 417 



' Impressionable organs' in C Haifa, 775 

 Incidence, angle of, 3 

 Incident ray, 2 

 Incus of Rot if era, 788 

 Index eye -piece, 381 



of visibility, 521 



Indian corn, epiderm of, 712 ; stomates 



of, 715 



Indirect division of nucleus, 538 

 Indusium in ferns, 675 



IRI 



Inflection of diverging rays, 62 

 Infusoria, 754-785 ; as food of Actino- 



phrys, 739 ; Ehrenberg's work on, 753 ; 



ciliate, 754, 772 ; unicellular nature of, 



755 note ; character of, 772 

 Infusorial earth, 607, 608, 611, 613, 617, 



620-622 ; from Barbadoes, 846, 849 

 Injected preparations, 1061 

 Inoceram us, portions of shell of, in chalk, 



1087 



INSECTS, 972-1007 

 mounting media for, 973 ; integument 



of, 974 ; tegumentary appendages of, 



974 ; scales of, 975-980 ; hairs of, 980 ; 



parts of head, 982; eyes, 982-987; 



antennae of, 987 ; mouth-parts of, 989 ; 



circulation of blood, 993 ; alimentary 



canal, 993; wings of, 994, 998-1000; 



trachea; of, 994 ; stigmata of, 995 ; 



sound-producing apparatus, 999 ; organ 



of smell, 1000; organ of taste, 1000; 



feet of, 1000-1002 ; stings of, 1002, 



1003 ; ovipositors of, 1002, 1003 ; egg* 



of, 1004 ; agamic reproduction of, 1006 ; 



embryonic development of, 1007 : 



' liver ' of, 1047 



- parasitic fungi in, 642, 645 



parts of, wooden slides for mounting, 

 450 



Insect work, dark-ground illumination 

 for, 423 ; polarised light for, 423 



Integument of insects, 974; of Acarina, 

 1010 



Integuments of ovule, 685 



Intensity of light, necessaries for, 417 



Intercellular substance, 1019 ; in carti- 

 lage, 1046 



Intercostal points, Stephenson on, 73 ; 

 not revelation of real structure, 73 



Interference, 62 



- image, 72 



Intermediate skeleton in Foraininifera, 

 801 ; of Globigerinida, 820 ; of Calca- 

 rina, 825; of Rotalia, 825 ; of Niimmu- 

 lites. 826 ; of Eozoon, 839 



Internal casts of Textularia, 823; of 

 Botalia, 824; of Ei>.:oun, 840 ; of wood, 

 1083 ; of shells in greensand, 1090 



Interpretation, errors of, 427 



' Interseptal canals ' of Calcarina, 830 



Intestine, cells of villi in, 1044 



Intine of pollen-grains, 720 



Intracellular digestion in zoophytes, 863 



Intussusception, 533 



- mode of growth of starch, 694 

 Invagination, 726 



Iiivertebrata, blood corpuscles of, 1038 



Inverted conjugate image, 24 



Iodine, as a test for starch, &c., 516 



Ipomcea pnrpurca, pollen-grains of, 721 



Iridescent scales of insects, 975 



Iris, epiderm of, 712 ; leaves of, 717 ; cells 



of pollen-chambers. 720 

 Iris-diaphragm, 297,313 ; fitted to Abbe's 



condenser, 312 

 Iris i/crntanica, epiderm and stomates of, 



715, 716 



