ii8o 



INDEX 



WAK 



Warmth, mode of applying, for cyclosis, 



692 



Wasps, wings of, 998, 999 ; sting of, 1003 

 Water, refractive index of, 8, 7 



distilled, for mounting Protophytes, 

 518 



milfoil, collecting, 527 

 Water-angle, 50 

 Water-bath, 452 

 Water-boatman, wings of, 1000 

 ' Water-fleas,' 959, 962 

 Water-globules in oil, 429, 430 

 Water-immersion objectives, 362 ; Zeiss's, 



370 



Water-lily, leaf-structure of, 717 ; cells 

 of pollen-chambers, 720 



' Water-mites,' 1013 



' Water-net,' or Hydrodictyon, 565 



Water-of-Ayr stone, 508 



Water-scorpion, 995. See Nepa 



'Water-snail.' See Limnceus 



Water- vascular system of Tcenia, 943 



Watson's microscopes, 199-202, 218, 224, 

 234, 237 ; coarse adjustment, 161, 202 ; 

 fine adjustment, 162, 172, 174, 175; 

 mechanical stage, 177 ; sub-stage, 187 ; 

 nose-piece, 292 ; condensers, 303, 304 ; 

 objectives, 375 ; eye-pieces, 379 



Wavellite in Mya, 924 



Web of spiders, 1015 



Weber's annular cells, 350 



Webster condenser, 308 



Weismann, on development of Diptera. 

 1007 



Wenham, on binocular vision, 105; on 

 cyclosis of Vallisneria, 690 



Wenham's suggestion of homogeneous 

 immersion, 29 ; his stereoscopic bino- 

 cular, 98, 99 ; his prism, 98 ; his para- 

 boloid, 316-317 ; his achromatic objec- 

 tive with single front, 361 ; his duplex 

 front objective, 362 



West, on Chcetocerece, 614 note 



'Whalebone,' 1033 



Wheat, starch-grains of, 695 



Wheatstone's stereoscope, 91 ; his pseudo- 

 scope, 92 



'Wheel-animalcules,' 753, 786. See 



KOTIFERA 



Wheel-like plates of Chirodota, 896 

 ' Wheels ' of Rotifera, 787 

 Whelk. See Buccinum 

 ' White ant,' ciliate parasite of, 774 

 White blood-corpuscles of Vertebrata, 

 1036 ; flow of, 1056 



fibrous tissue, 1038-1041 



of egg, as a preservative medium, 519 

 Whitney's directions for examination of 



frog's circulation, 1060 

 Wild clary, spiral fibres of, 693 

 Williamson (W. C.), on Volvox, 556 note ; 



on structure of fish-scales, 1027; on 



structure of coal-plants, 1084 

 Willow-herb, emission of pollen-tubes, 



722 



Wing of Agrion, circulation in, 994 

 Winged seeds, 724 



ZOO 



Wings of insects, 998-1000; of Ptero- 

 phorus, 999; venation of, in Neuro- 

 ptera, 998 



Wodderborn, on Galileo's invention of 

 compound microscope, 121, 125 



Wodderborn's ' perspicillum,' 125 



Wollaston's doublets, 36, 153 ; his camera 

 lucida, 278 



Wood, arrangement of, 700, 702 ; concen- 

 tric rings of, 703 ; fossilised, 705, 1083 



Wooden slides for opaque objects, 450 



Woody fibre, 696 



tissue of ferns, 674 



Working eye-pieces, 378 



Worms, 943-956 



X 



Xylem of Exogens, 697, 698, 710 

 Xylol-balsam as a preservative medium, 

 518, 521 



Yeast, 646 ; fermentation due to, 646 

 Yellow cells, in Actinice, 848 ; in radio- 



larians, 848 



fibrous tissue, 1039, 1040 

 Yolk-bag of young fish, circulation on, 



1057 

 Yucca, epiderm of, 712 ; guard-cells of 



stomates in, 715, 716 



Zanardinia, swarm-spores of, 627 



Zea Mais, epiderm of, 712 ; stomates of, 

 715 



Zeiss's oil-immersion objectives, 29 ; his 

 eye-pieces and objectives, 34 ; his 

 photographic microscope, 178, 257, 258 ; 

 his mechanical stage, 179, 183 ; his 

 latest microscope, 206, 237; his dis- 

 secting microscope, 248, 253 ; his apla- 

 natic loup, 249, 268 ; his calotte nose- 

 piece, 292 ; his sliding objective 

 changer, 293 ; his iris-diaphragm, 297 ; 

 his spectral ocular, 327 ; his apochro- 

 matic objective, 366-374 ; his water- 

 immersion, 370 ; his apochromatic, for 

 resolving diatom markings, 592 ; his 

 apochromatic for study of monads, 762 



Zeiss-Steinheil's loups, 249, 268 



Zentmayer's microscope, 204 ; swinging 

 sub-stage in, 204 



Zeolite, 1095 



Zinc, chlor-iodide of, as a test, 516 



cement, Cole's, 445 ; Zeigler's, 445 



Zoantharia, 877 



Zoea, 970 



Zonal structure in crystals, 1073 



Zoochlorellse of Heliozoa, 734 



Zobcytium of Ophrydium, chemical com- 

 position of, 778 



