INDEX 



II7I 



REA 



EOS 



Eeagents, mode of labelling bottles, 402 

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



object image, 375 

 Recomposition of light by prisms, 18 

 Red ant, integument of, 974 



blood-corpuscles of Vetebrata, 1084 ; 

 size of, in various Vertebrata, 1035 ; 

 relative sizes of, in various Vertebrata, 

 1036 



coral, 877 



corpuscles, flow of, 1056 



' Red snow,' due to Palmella cntentcf, 



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 

 Actinosphcerium, 741 ; of Clathrulina, 

 742 ; of Euglypha, 746 ; of sponges, 

 857 ; of Campanulariida, 870 ; sexual, 

 of Polyzoa, 907 ; agamic, of Entomo- 

 straca, 963 ; agamic, of Aphides, &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 

 Bete mucosum, 1042 

 Retepora, calcareous polyzoaries of, 909 

 Reticidaria, 733 ; characters of, 733 ; ex- 

 amples of, 734-737 



Reticulated ducts of Phanerogams, 698 

 Retinulse, 983 



Revolving nose-piece, Nelson's, 295 

 Rezzi, on invention of compound micro- 

 scope, 125 

 Rhabdammina, 813 



abyssorum, 815 

 RJiabdolithus pipa, 847 



sceptrum, 847 



Rhabdoliths, in chalk and limestone, 



1084 



Rhabdom, 983 

 Rhabdopleura, 909 

 Rhamnus, stem of, 703 

 Rheophax sabulosa, 815 



scorpiurus, 815 

 Rhinoceros, horn of, 1033 

 Rhizocarpece, 681 

 Rhizoids of mosses, 669 

 Rhizome of ferns, 675 

 RHIZOPODA, 733-747 



protoplasm of, 531 ; ectosarc of, 534 ; 

 skeletons of, 795; sarcode of, 1018; 

 pseudopodial network of, 1053 



Rhizosolenia, 614 



cyclosis in, 587 

 Rhizostoma, 874, 876 

 Rhizota, 790, 791 



Rhododendron, pollen-grains of, 722 

 Rhodospermete, 574 

 Rhodospermin, 631 

 Rhodosporece, 625 

 Rhopalocanium ornatum, 85?. 

 Rhubarb, stellate raphides of, 696 ; spiral 



ducts of, 699 



Rhynchonellida, 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 



Ridd ell's binocular microscope, 97 



Ring-cells, 446-448 



Rivalto (Giordano da), on invention of 

 spectacles, 118 



RivulariacecB, hormogones of, 548 



Roach, scales of, 1028 



Rochea falcata, epiderm of, 714 



Rock, ground-mass of, 1072 ; fluxion- 

 structure of, 1073 



sections, method of examining, 1081 

 Rocks, method of making sections of, 



1066-1068 ; metamorphism of, 1076 



Rodents, hair of, 1030 



Root of Phanerogams, structure of, 700 

 et seq. 



Root-cap, 710 



Rosalina varians, 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 r2 



