ii68 



INDEX 



PHI 



PhilontJms, antennae of, 988 



Phloem, 710 



of Exogens, 697 



Pholas, shell of, 924 



Phoronis, 950 



Phosphorescence of sea, AueioNoctiluca, 



765 



Phosphorus, as a mounting medium, 521 

 Photographic microscope, Zeiss's, 257, 



258 

 Photometrical equivalent of different 



apertures, 50 

 Photo-micrograph through eye of Lam- 



pyris, 984 

 >ho 



Photo-micrography for micrometry, 277 ; 

 projection eye- pieces for, 380 



Campbell's differential screw used in, 

 165 



Phryganea, eye of, 983 



Phycocyanin in Chroococcacecs, 547 



Phyco-erythrin, 631 



Phycomyces nitens, 641 



Phycophaein, 626 



Phylactolcemata, 909 



Phyllite, 1077 note 



Phyllopoda, 962 



Pliyllosomata, skeleton of, 968 



Physarum album, development of, 635 



Physcia parietina, 650 



Physma chalaganum, 650 



Phytelephas, endosperm of seed of, 693 



Phytophthora infestans, 639, 640 



Phytopti, mouth-parts of, 1010 



Phytoptidce, 1008 ; characters of, 1014 



Phytoptus, larva of, 1009 



Picric acid, 485 



Picro-carmine, 489 



Piedmontite, 1095 



Pieridce, scales of, 975 



Pigment-cells of cuttles, 942 ; of ver- 

 tebrate skin, 1042 ; of fishes, 1043 ; of 

 Crustacea, 1043 



Pigmentum nigrum, of eye, 1043 



Pike, scales of, 1028 



Pileorhiza, 710 



Pileus of Acetabularia, 563 



Pilidium gyrans, 950 



Pilulina Jeffreysii, 812 



Pimpernel, petals of, 719 



Pines, pollen-grains, showers of, 722 note 



Pinna, structure of shell of, 919-922; 

 prisms of shell of, in Globigerina ooze, 

 1086 ; prisms of, in chalk, 1087 



nigrina, colour of shell of, 921 

 Pinnularia, 617 



dactylus, 621 



nobilis, 621 

 Pinus canadensis, 443 

 Pipette, 351, 476 

 Pisolithic grains, 1084 

 Pistil, 722 



Pitcher-plant, spiral fibre-cells of, 698 

 Pith, arrangement of, 700, 762 

 Pitted ducts of Phanerogams, 699 

 Placoid scales, 1028 

 Plagioclase felspar, 1080 

 Planaria, stomach of, 946 



POL 



Planar ice, 946 ; movement of, 946 ; fis- 

 sion of, 947 ; ocelli of, 947 ; intracellular 

 digestion in, 863 



Planarians. See Planarice 



allied to Ctenophora, 883 

 Plano-concave lens, 13 

 Plano-convex lenses, 13, 15, 22, 37 

 Planorbulina, 824 



Plantago, 'Plantain,' cyclosis in, 691 

 Plants and animals, differences between, 



531 



Planulse, 868 



Planularia liexas, in chalk, 1087 

 Plasmode in cells of Nitella, 579 note ; 



of jEthalium, 634 ; of Myxomycetes, 



635 

 Plasmodium of Protomyxa aurantiaca, 



729 



Plastid, contrasted with cytode, 727 

 Plastidules, flagellated, of Protomyxa, 



729 

 Plates, calcareous, of Holothurioidea, 



895 



Pleochroism, 1078, 1098 

 Pleochroism, variations of, 1080 

 Pleurosigma, 588, 617 



diffraction image of, 71 



angulatum, 69-71 ; as test for defi- 

 nition, 426 ; markings on, 592, 593 



formosum, as test for definition, 426 



Spencerii, sporules of, 597 



Pliny, on cauterisation by focussing sun's 



rays, 117 ; on sight, 118 

 Ploima, 791, 792 

 PlumateUa, collecting, 528 

 ' Plumed-moth,' wings of, 999 

 Plumule of Pieridce, 975 

 Plutarch, on myopy, 118 

 Pluteus larva of echinoids, 897-899 

 Podocyrtis cothurnata, 847 



mitra, 847, 852 



Schomburgkii, 849, 852 

 Podophrya quadripartita, 784 ; imma- 

 ture form, 785 



elongata, 785 

 Podosphenia, sporules of, 597 

 Podura scale as test for high powers, 



389 



1 Podura scales,' 976, 979 



Poduridce, 979 



Pointer in eye-piece, 381 



Poisons, micro-chemistry of, 1103 



Polarisation tints, 1080 . 



Polariscope, condensers for use with, 

 314 ; for examination of gastropod 

 palates, 933; crystals for use with, 

 1097 ; list of objects for, 1099 



Polarised light, rings and brushes of mine- 

 rals under, 319, 320 ; for insect work, 

 423 ; use of, in micro-petrology, 1068 



Polariser, 318, 319; achromatic conver- 

 gent for, 1070 note 



Polarising apparatus, 317-319 ; condenser 

 for, 314 ; Swift's illuminating and, 319 



Polarising prism, substitution of opales- 

 cent mirror for, 194 



' Polierschiefer,' 617 



