INDEX 



Il6q 



POL 



Polishing ground sections, 511 



sections of hard substances, 506 



- -slate, 617 



- -stones, 508, 617 



Polistes (wasp>, with attached mould, 



64'2 

 Pollen-chambers of anthers, 720 



- -grain and tube, 684 



- -grains, 719 ; form of, 720 ; experi- 

 ments with, 721 



mass, of orchids, 722 



- tube, 721 



- tubes, traced through the style, 723 

 Polliniura of orchids and asclepiads, 722 

 Pollinoids of Floridece, 632 ; of lichens, 



650 



Polyaxial spicules, 859 

 Polycelis levigatus, 947 

 PolyclinidcE, 913 

 Polycystina, 846, 851 

 PoifycystimcB, as test for low powers, 



389 ; mounting, 481 

 Polydesmidfe, 981 

 ' Polygastrica,' Ehrenberg's erroneous 



views 011, 753 



Polygointin, pollen-grains of, 721 

 Pofymorphina, 820 

 Polyommatus Argus, scales of, 976 

 Polyparies of zoophytes, 862 

 Polypary of hydroids, 867 

 Polypes, 863. See Hydrozoa 

 Polypide, of Polyzoa, 906 ; formation of 



buds from, 907 

 Polypidom of zoiiphyte, 904 

 Polypite, of hydroids, 867 

 Polypoduim, sori of, 675 

 Polyporus, 647 



Polystichuin angulare, apospory in, 680 

 Polystomella, shell of, 797 



- craticulata, 827, 829 



- crispa, 827, 829 

 Polythalamous Foraminifera, 796 

 Poli/toma uvella, life-history of, 759 

 Pofytrema, 824 ; mode of growth com- 

 pared with EozoiJn, 838 



- miniaceum, colour of, 799 

 Polijtrichum commune, 670, 671 

 Polyxenus lagurus, hair of, 981 



- hair of, as test for objectives, 389 ; 

 as test for definition, 426 



Polyzoa, collecting, 527, 528; keeping 

 alive, 528 ; ' cell ' of, 904 ; structure 

 of, 904 ; gemnife of, 906 ; muscular 

 system, 907 ; sexual reproduction of, 

 907 ; ' colonial nervous system,' 907 

 and note ; fresh-water, lophophore of, 

 909 ; epistome of, 909 ; classification 

 of the group, 909; bibliography of, 

 910 ; relation to Brachiopoda, 927 ; 

 ' liver ' of, 1047 



Polyzoaries in coralline crag, 1090 



Polyzoary, 904 



Pond-stick, 526 



Poplar, pollen-grains of, 722 



Poppy, laticiferous tissue, 695 ; seed of, 

 723 



Porcellanea, 801-810 



PKI 



Porcellanous shells of Foraminifera, 

 799; of Gastropoda, 928 



and vitreous Foraminifera, difference 

 in, 799-801 



Porcupine, hair of, 1030 



Pores of sponges, 856 



Porpliyra, trychogyne of, 632 



Porphyritic crystals, glass inclusions in, 

 1074 



' Portable ' microscope, 245-247 ; Powell 

 and Lealand's, 245 ; Rousselet's bino- 

 cular, 245 ; Swift's, 245 ; Baker's, 246 ; 

 Bausch and Lomb's, 247 



Portwnus, skeleton of, 968 



Positive aberration, 360 note 



eye-piece, 43 



- eye-pieces, 377, 378 



Potash, caustic, action on horny sub- 

 stances, 517 

 Potato-disease, 640 



starch-grains of, 695 



- tubers, starch in, 694 



Powell (T.), formula for objective, 34 

 Powell and Lealand's homogeneous im- 

 mersion objective, 30 ; fluorite lenses, 

 35 ; high-power binocular, 105 ; sub- 

 stage, 186, 195, 196 ; their microscopes, 

 194, 218, 237 ; portable microscope, 

 245 ; rotating nose-pieces, 291 ; achro- 

 matic condenser, 301 ; achromatic oil 

 condenser, 302 ; apochromatic con- 

 denser, 302 ; dry achromatic condenser, 

 809 ; chromatic oil condenser, 310 ; 

 condenser for polariscope, 314 ; bull's- 

 eye, 333 ; vertical illuminator, 337 ; 

 protecting ring for coarse adjustment, 

 352 ; water-immersion objectives, 362, 

 364 ; ^pinch objective, for observation 

 of cyclosis, 689 ; objectives for study 

 of monads, 762 



Powell's (H.) microscope, 155 ; fine ad- 

 justment applied to the stage, 155 



- lenses, 361 



- fine adjustment, 174 

 Prasmowski and Hartnack's water-im- 

 mersion objectives, 362 



Prawn, skeleton of, pigment of, 969 

 Preparation of vegetable tissues, 514 

 Presbyopy, 118 

 Preservative media, 517-522 

 Primary tissues of Vertebrata, 1017 

 Primordial cells, 535, 536 



- utricle, 533 ; of desmids, 580 ; of Pha- 

 nerogam cells, 688 



- chamber in Foraminifera, 798; of 

 Orbitolites, 806 



Primrose, cells of pollen-chambers, 720 

 1 Prince's feather,' seed of, 723 

 Principle of microscopic vision, 43 

 Principles of microscopical optics, 1 

 Pringsheim, on generative process of 



Pandorina, 557; on VniirJ/fria, 563 

 Prism, refraction by, 8, 9 ; Wenham's, 



98 ; Stephenson's erecting, 100 



- polarising, substitution of opalescent 

 mirror for, 194 



rectangular, in place of mirror, 192 



4 F 



