INDEX 



II7I 



REA 



Reagents, mode of labelling bottles, 402 

 Real image, 14 note; formation of, 23, 24 



object image, 375 

 Record/position of light by prisms, 18 

 Red ant, integument of, 974 



blood-corpuscles of Vetebrata, 1034; 

 size of, in various Vertebrata, 1035; 

 relative sizes of, in various Vertebrata, 

 1036 



- coral, 877 



corpuscles, flow of, 1056 



' Red snow,' due to PalmeUa cruenta, 



558 



' Red spider,' 1013 

 Red spots in Infusoria, 775 

 Reflector, Sorby's parabolic, 334 

 Refracted ray, 2 



Refracting angle of a prism, 9, 18 

 Refraction, 57 



angle of, 3 



of light, laws of, 2, 3 



by plane surface, 3, 4 ; by curved sur- 

 face, 5 ; by prisms, 8, 9 ; by lenses, 10- 

 25 



Refractive index, absolute, 2 ; of water, 

 3 ; relative, 4, 5 ; of crown glass, 5 ; 

 of flint glass, 5 ; of balsam, 77 ; of gum 

 styrax, 521 ; of Canada balsam, 521 ; 

 of monobromide of naphthalin, 521 ; of 

 phosphorus, 521 



of silicious coat of diatoms, 521 



- indices of air, of cedar oil, of water, 60 



Reichert's loups, 38 ; his lever fine ad- 

 justment, 171 ; his microscopes, 206, 

 210, 224, 241, 242, 264-266 ; his objec- 

 tives, 374, 375 ; his thermo-regulator, 

 453 



Reindeer, hair of, 1030 



Reproduction in Actinophrys, 740; of 

 Actinosph cerium, 741 ; of C la thru Una, 

 742; of Euglypna, 746; of sponges, 

 857; of Campanulariida, 870; sexual, 

 of Polyzofi, 907 ; agamic, of Entomo- 

 fitraca, 963 ; agamic, of Apliiilrn, \. r c., 

 1006 



Reproductive organs of Acarina, 1011 



REPTILES, lacunae in bone of, 1022 ; 

 cement in teeth of, 1026 ; plates in skin 

 of, 1026 ; epidermic appendages of, 

 1029 ; red blood-corpuscles of, 1034, 

 1035; muscle-fibre of, 1049; lungs of, 

 1063 



Reseda, seeds of, 724 



Residuary secondary spectrum, 365 



Resins, solvents for, 517 



Resolving power of objectives, 83, 425 



of object-glasses, 44 ; of lenses, 64 ; 

 of objective and numerical aperture, 

 75, 393 



Respiration of insects, apparatus of, 994 

 Respiratory organ of spiders, 1014 

 Mete nutcosum, 1042 

 Retrpora, calcareous polyzoaries of, 90'.i 

 Reticiihiria, 733; characters of, 733; ex- 

 amples of, 734-737 



Reticulated ducts of Phanerogams, 698 

 Retinula-, n.s:; 



EOS 



Revolving nose-piece, Nelson's, 295 

 Rezzi, 011 invention of compound micro- 

 scope, 125 



Rlialidammina, 813 

 aliijssorum, 815 

 Rlialtdolitlius pi pa, 847 



sceptrum, 847 



Rhabdoliths, in chalk and limestone, 



1084 



Rhabdom, 983 

 Wi<il>dplri<r<i, 909 

 li'lui limns, stem of, 703 

 Rlieopliax sahulosa, 815 



scorpiiiriis, 815 

 Rhinoceros, horn of, 1033 

 RliizocarpecB, 681 

 Rhizoids of mosses, 669 

 Rhizome of ferns, 675 

 RHIZOPODA, 733-747 



protoplasm of, 531 ; ectosarc of, 534 ; 

 skeletons of, 795 ; sarcode of, 101S ; 

 pseudopodial network of, 1053 



Rliizosolenia, 614 



cyclosis in, 587 

 Rltizostoma, 874, 876 

 RMzota, 790, 791 



Rhododendron, pollen-grains of, 722 

 Rlindospermece, 574 

 Rhodospermiii, 631 

 Rhodosporece, 625 

 Rhopalocanium ornatum, 859 

 Rhubarb, stellate raphides of, 696 ; spiral 



ducts of, 699 



RlupiclioiiellidcB, shell structure of, 927 



Ribbons of sections, 464, 469 



Ribes, pollen-tubes of, 723 



Rice, silicified epiderm of, 715 



' Rice-paper,' 687 



Rice-starch, 695 



Riddell's binocular microscope, 97 



Ring-cells, 446-448 



Rivalto (Giordano da), on invention of 

 spectacles, 118 



Rivulu fiiifC(c, hormogon.es of, 548 



Roach, scales of, 1028 



Rurlicii fiilrntii, epiderm of, 714 



Rock, ground-mass of, 1072 ; fluxion- 

 structure of, 1073 



sections, method of examining, 1081 

 Rocks, method of making sections of, 



liniil-1068 ; metamorphism of, 1076 

 Rodents, hair of, 1030 

 Root of Phanerogams, structure of, 700 



ft St'l]. 



Root-cap, 710 



Hiixtilinit rctriiiiix, 798 



Rose, glandular hairs of, 714 



Ross (Andrew), on correction of object- 

 glass, 19-21 ; his early form of achro- 

 matic microscope, 152 ; mechanical 

 movements of his stage, 153 ; his fine 

 adjustment, 153, 173 ; on illumination 

 of objects, 300 ; his arrangement for 

 locking coarse adjustment, 352 ; his 

 achromatic objectives, 356-358 ; his 

 lever of contact for testing covers, 

 440 



4 F 2 



