INDEX. 761 
Imaginal discs, cephalothoracic, 77 
development of, 74, 305 
evolution of, 305 
history of discovery of, 73 
inferior thoracic, 83 
labial, 83 
leg, 83 
maxillary, 83 
mesoblast of, 77, 334 
morphology of, 72, 73, 304 
number of, 4 
origin of, 74 
relations of, in nymph, 315 
relation to paraderm, 303 
structure of, 334 
thoracic, in larva, 83 
upper thoracic, 319 
Imaginal rudiments. See Histoblast 
Imago, 4 
development of, from nymph, 
344 
escape from pupa, 4 
immature, 4, 216 
Imbedding, methods of, 95 
Immature head capsule, 124 
Immunity of imaginal tissues in pupa, 
310 
Indirect cell division, 269 
Infra-cesophageal ganglia, 465 
functions of, 475 
of pronymph, 313 
Insects, anatomy of, bibliography 
to, 7 
relation of, to Vertebrates, 109 
Instincts of female Blow-fly, 5 
Integument, abdominal, 328 
development of, 280, 318, 344 
of head and thorax, 318 
of larva, 35 
Intercalated cells, 276 
Intercellular matrix, 264 
Intermediate substance of muscle- 
fibres, 285 
Internal generative organs, descrip- 
tive anatomy of, in female, 666 
in male, 660 
bibliography of, 684 
development of, 684 
Internal anal valves, 744 
Internal light of retina, 577 
Internal ridges of thorax, 185 
Internal skeleton of head, 119 
Internal tubercle, 461 
Intersegmental muscles, 219 
Intersegmental spiracles, 181, 319, 
oot 
Intestinal coil, in embryo, 426 
in nymph, 430 
Intestinal ganglia of larva, 59 
Intracellular digestion, 297 
Intratracheal pressure, 377 
Intratracheal valves, 366 
Invagination of head discs in em- 
bryo, 259 
Iris, 531 
Iris cells, 529 
Isotropous substance, 285 
Jackson, H., on head segments, 108 
on development of oviducts, 704 
on parovaria, 674 
Jaworowski on dorsal vessel, 285, 
656 | 
Joints, 1or 
Jousset de Bellesme on halter, 615, 
616 
Jugum, 119, 122, 123 
Julus, Heathcote on, 157 
Jurine on flight, 206 
Karop on mounting objects in glyce- 
rine, 214 
Karyokinesis, 269, 270 
in muscle, 287 
in spermatogenesis, 696 
Karyomitosis. See Karyokinesis 
Karyoplasm. See Nucleoplasm 
Keimfach, 709 
Keimstreif, 245. See Primitive band 
Kennel on yelk segmentation, 237 
Kistoid cornea, 526 
Kolliker on eye of Astacus, 506 
on classification of eyes, 505 
Kérnchenkugeln, 273, 297. See 
Granule cells 
Korotneff on development of Gryllo- 
talpa, 233 
Korschelt on chorion, 680 
on vitelline membrane, 683 
on nutrient cells of egg, 702 
Kowalevski, dorsal organ of, 17, 254 
on cell chaplets, 343 
on development of brain in 
Sagitta, 487 
on development of nervous sys- 
tem in Hydrophilus, 479 
