INDEX, 



791 



Pilidium-larva, of Nemertes, 631. 



Pillischer, Mr., his Student's Mi- 

 croscope, 61, 62 ; his Lamp, 140. 



Pinna, structure of shell of, 593 — 

 596 ; fossil, in Chalk, 757. 



Pinnularia, 308. 



Pistillidia, see Archegonia. 



Piper, Mr., his portable Object- 

 Cabinet, 235. 



Pith, structure of, 386, 408. 



Placoid scales of Fish, 703. 



Planaria, 625—627. 



Planorbulina, 503. 



Plantago, cyclosis in hairs of, 395. 



Plants, distinction of from Animals, 

 240, 241, 434, 435. 



Plate-glass Cells, 227, 228. 



Pleurosigma, 308 ; nature of mark- 

 ings on, 159, 160, 279—282 ; value 

 of as'Tests, 178—181. 



PI uteus-larva, of Echinus, 570—572. 



Pocket Microscope, Beale's, 82. 



Podura, scale of, 657, 658; use of, 

 as Test-object, 151, 178. 



Poisons, detection of, 776.' 



Polarization, Objects suitable for, 

 773, 774. 



Polarizing Apparatus, 118—120. 



Polistes, fungous vegetation in, 356. 



Pollen-grains, development of, 426, 

 427 ; structure and markings of, 

 427, 428. 



Polyclinians, 585. 



Polycystina, nature of, 442, 523 ; 

 distribution of, 523 — 526. 



Polygastrica, see Infusoria. 



Polymorphina, 500. 



Polyommatus argus, scale of, 657. 



Polypes, see Hydra and Zoophytes. 



Polypodium, fructification of, 377. 



Polystomella, 506—509. 



Polvthalamous Forarninif era, 482 — 

 486. 



Polytrema, 504. 



Polyzoa, 576 — 584 ; general struc- 

 ture of, 576 — 581 ; classification 

 of, 581, 582. 



Pond-Stick, Baker's, 236. 



Poppy, seeds of, 431, 432. 



Popular Microscope, Smith and 

 Beck's, 73, 74. 



Porcellanous Foraminifera, 486, 488 

 —498. 



Porcellanous shells of Gasteropods, 

 604. 



Porcupine, quill of, 705. 



Porifera, see Sponges. 



Potato-disease, 363. 



Powell and Lealand's Microscope, 



78, 79 ; their large Microscope, 



79, 80 ; their Binocular for high 



powers, 87, 88 ; their Achro- 

 matic Condenser, 109, 110 ; their 

 White-cloud Illuminator, 117 ; 

 their Vertical Illuminator, 126. 



Prawn, shell of, 649. 



Preservative Media, 220—223. 



Primordial Cell, 245, 382. 



Utricle, 241—243, 390. 



Pringsheim, Dr., his observations 



on Vaucheria, 326 ; on Hydro- 

 dictyon, 329; on ffidogonium, 

 333 ; on Sphacelaria, 360. 



Prismatic Shell-substance, 593 — 

 596._ 



Prism" Amici's, 112 ; Nachet's 

 Erecting, 91 ; Wenham's, 33 ; 

 Camera Lucida, 98—102; Spec- 

 troscope, 66, 67 ; Polarizing, 118, 

 119. 



Pritchard Mr., jewel-lenses worked 

 by, 21. 



Proboscis of Bee, 668—670 ; of But- 

 terfly, 670, 671 ; of Fly, 668. 



Proteus, blood-corpuscles of, 711. 



Prothallium of Ferns, 379—382. 



Protococcus, life-history of, 24(! — 

 251 ; conditions influencing 

 changes of, 250, 251 ; its relation 

 to Ulvacese, 320. 



Protoplasm, of Vegetable cell, 242, 

 390," 391; of Animals, 689-693. 



Protophyta, general characters of, 

 239—246. 



Protozoa, 434, 435 ; their relations 

 to Protophyta, 240, 435. 



Pseud-embryo of Echinoderms, 568 

 —575. 



Pseudo-Navicellse of Gregarinida, 

 449. 



Pseudopodia of Rhizopods, 435 — 

 445. 



Pseudoscope, 29. 



Pseudoscopic Microscope of MM. 

 Nachet, 35—37. 



Vision, 30. 



Pteris, fructification of, 377 ; pro- 

 thallium of, 379, 380. 



Pterodactyle, bone of, 764, 765. 



Paccinia, 362. 



Purpura, egg-capsules of, 613 ; de- 

 velopment of, 614 — 618. 



Pycnogoiiidce, 636 — 638. 



Quekett, Prof. J., his Dissecting 

 Microscope, 51 — 53 ; his Indi- 

 cator, 98 ; on structure of Bone, 

 764, 765. 



Quinqueloculina, 489. 



Radiolaria, 438—442, 523—526. 

 Rainey, Mr., his Moderator, 141 ; 



