INDEX 



1169 



POL 



PRI 



Polishing ground sections, 511 



sections of hard substances, 506 



-slate, 617 



-stones, 508, 617 



Polistes (wasp^, with attached mould, 



642 

 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 

 Pollinium of orchids and asclepiads, 722 

 Pollinoids of Floridece, 632 ; of lichens, 



650 



Polyaxial spicules, 859 

 Polycelis levigatus, 947 

 Poiyclinid.ee, 913 

 Polycystina, 846, 851 

 Polycystina, as test for low powers, 



389 ; mounting, 481 

 Polydesmiclce, 981 

 ' Polygastrica,' Ehrenberg's erroneous 



views on, 753 



Polygonum, pollen-grains of, 721 

 Polymorphina, 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 zoophyte, 904 

 Polypite, of hydroids, 867 

 Poly podium, sori of, 675 

 Polyporus, 647 



Polystichum angulare, apospory in, 680 

 Polystomella, shell of, 797 



craticulata, 827, 829 



crispa, 827, 829 

 Polythalamous Foraminifera, 796 

 Polytoma uvella, life-history of, 759 

 Polytrema, 824; mode of growth com- 

 pared with Eozofin, 838 



miniaceum, colour of, 799 

 Polytrichum 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 ; gemmae 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 



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 



Portunus, 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 ; ^-inch 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, 517r522 

 Primary tissues of Vertebrata, 1017 

 Primordial ceUs, 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 

 ' Prince's feather,' seed of, 723 

 Principle of microscopic vision, 43 

 Principles of microscopical optics, 1 

 Pringsheim, on generative process of 



Pandorina, 557 ; on Vaucheria, 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 



