INDEX. 



Aberration, chromatic, 73, 74. 

 spherical, 71, 72. 



Acalephs, see Medusas. 



Acarida, 581, 582. 



Achyla prolifera, 315, 316. 



Acineta-form of Vorticella, 419, 420. 



Achnanthes, 297. 



Achromatic Condenser, 131-133, 136 ; use 

 of, 172, 173. 



Achromatic correction, 41 ; principle of, 73, 

 74 ; application of, 74-76. 



Actiniform Zoophytes, 474-476. 



Actinocydus, 289, 290. 



Actinophrys, 407-409. 



Adipose tissue, 607, 608, 664. 



Adjustment of Focus, 86, 87; uses of, 162- 



165. 



of Object-glass, for thickness 

 of cover, 76, 77 ; mode of 

 making, 165-168. 



Agates, sponge-remains in, 633. 



Air-bubbles, microscopic appearances of, 

 184. 



Alcyonian Zoophytes, 472-474. 



Alcyonidium, 496, 497. 



ALGJE, higher, microscopic structure of, 

 328-333 (see Protophyta). 



Amaroucium, structure of, 501, 502. 



Amici's Prism for oblique illumination, 137. 



Amoeba, 405-407. 



Anacharis alsinastrum, rotation in, 364, 

 365. 



Anagallis, petal of, spiral vessels in, 396. 



Angular aperture of object-glasses, 71-73, 

 76; real value of, 188-192. 



Animalcule-Cage, 148, 168. 



ANIMALCULES, early researches on, 38 ; 

 Ehrenberg's observations on, 47-49, 411- 

 424 ; Dujardin's researches on, 49 ; see 

 Infusoria, Rhizopoda, and Rotifera. 



Animals, Distinction of, from Plants, 247, 

 248,409,410. 



ANNELIDA, 535 ; marine, circulation in, 535, 

 536 ; metamorphoses of, 536, 537; lumi- 

 nosity of, 537 ; fresh- water, 537, 538. 



Annular Condenser, Shadbolt's, 139, 140. 



ANNULOSA, 529 ; see Entozoa, Turbellaria, 

 and Annelida. 



Anomia, structure of shell of, 512. 



Antenna3 of Insects, 564, 565. 



Anthers, structure of, 396, 397. 



Antheridia of Cryptogamia, discovery of, 

 45, 46; see Antherozoids. 



Antherozoids, of Vaucheria, 314 ; ofSphas- 



roplea, 318 ; of Characeas, 325, 326 ; of 

 Fuci, 330 ; of Florideae, 331 ; of Mar- 

 chantia, 347 ; of Mosses, 349 ; of Ferns, 

 355, 356. 



Aphides, non-sexual reproduction of, 580, 

 581. 



Anthozoa. 457, 472-476. 



Apple, cuticle of, 389, 390. 



Apus, 544. 



Aquatic Box, 148, 169. 



ARACHNIDA, microscopic forms of, 581, 582 ; 

 eyes of, 582 ; respiratory organs of, 582, 

 583 ; feet of, 583 ; spinning apparatus of, 

 583. 



Arachnoidiscus, 290, 291. 



Archegonia, of Marchantia, 344-347 ; of 

 Mosses, 349 ; of Ferns, 356-358. 



Arcus Senilis, 665. 



Areolar tissue, 603. 



Argulus, 547, 548. 



Artemia, 545. 



Ascaris, 531, 532. 



Asci of Lichens, 334 ; of Fungi, 335. 



Ascidians, compound, 50,500 ; social, 502 

 505. 



Asphalte, use of, 207. 



Aspidium, fructification of, 353-355. 



Aspidisca-form of Trichoda, 421. 



Asteriada, skeleton of, 482, 483 ; metamor- 

 phoses of, 486-488. 



Asteroida, 472-474. 



Auditory vesicles of Mollusks, 527, 528 ; 

 development of, 525. 



Avicularia of Polyzoa, 498, 499. 



Azure blue butterfly, scales of, 195, 558. 



Bacillaria paradoxa, 296 ; movements of, 

 287, 288. 



Bailey, Prof., his diatomaceous tests, 199. 



Balani, metamorphoses of, 548-550. 



Bafk, structure of, 384, 385. 



Barnacles, metamorphoses of, 548-550. 



Bat, hair of, 195, 595,596. 



Battledoor scale of Polyommatus, 195, 558. 



Batrachospermece, 321, 322. 



Bee, eyes of, 561 ; proboscis of, 567 ; 

 wings of, 574 ; sting of, 578. 



Berg-mehl, 303, 304. 



Beroe, 470, 471. 



Biddulphia, 299 ; markings on, 281 ; self- 

 division of, 284. 



Binocular Microscopes, 114-117. 



Bird, Dr. Golding, on preparation of Zoo- 

 phytes, 474. 



