INDEX 



Aberration, Chromatic, 9 — 11. 



Spherical, 12—14. 



■ means of reducing 



and correcting, 10 — -16. 



Acaleplis, see Medusa. 



Acanthometrina, 526. 



Acarida, 685, 686. 



Achlya prolifera, 327, 328. 



Achnanthes, 304, 305. 



Achromatic Condenser, 123 — 126 ; 

 use of, 170, 171. 



Achromatic Correction, principle 

 of, 13, 14. 



Achromatic Objectives, see Object- 

 Glasses. 



^d?ieta-parasitism in Infusoria, 

 465, 466. 



Acroctadia, spines of, 558, 559. 



Actiniform Zoophytes, 552 — 554. 



Actinocyclus, 298. 



Actinophrys, 438 — 442 ; reproduc- 

 tion of, 446, 447. 



Actinoptychus, 299. 



Actinotrocha-la,rva, of Sipunculus, 

 629, 630. 



Adipose tissue, 721, 722. 



Adjustment of Focus, 42, 43, 146 — 

 149. 



Adjustment of Object-glass, 16 — 18, 

 149—152. 



AZthalium septicum, 361, 362. 



Agamic reproduction, of Rotifera, 

 476 ; of Entomostraca, 643 ; of 

 Insects, 684, 685. 



Agarics, generation of, 365. 



Agassiz, Prof., on scales of Fish, 

 702. 



Agates, sponge-remains in, 758. 



Agrion, circulation in larva of, 672. 



Air-bubbles, Microscopic appear- 

 ances of, 167, 168 ; in Microscopic 

 preparations, 233. 



Air-Pump, use of in mounting ob- 

 jects, 216, 233. 



Albuminous substances, tests for, 

 197, 198. 



Alburnum, 402, 410. 



Alcyonian Zoophytes, 550 — 552. 



Alcyonidium, 589. 



Alg^e, higher, microscopic struc- 

 ture of, 343—350; (see Proto- 

 phyta). 



Allman, Prof., on Cordylophora, 

 538 ; on Fresh-water Polyzoa, 

 582 note ; on Appendicularia, 591 

 note. 



Alternation of Generations, 385, 

 539 note, b£l note. 



Alveolina, 491, 492. 



Amaranthus, seeds of, 431, 432. 



Amaroucium, 58 j — 588. 



Amici, Prof., his early construction 

 of Achromatic lenses, 14, 15 ; his 

 Prism for oblique Illumination, 

 112 ; his drawing Camera, 100. 



Amoeba, 442 — 445 ; reproduction of, 

 446, 447. 



Amoeboid state of Volvox, 255 — 

 257 ; of protoplasm of Chara, 342 

 note; of protoplasm of roots of 

 Mosses, 371 ; of Myxogastric 

 Fungi, 361 ; of colourless Blood- 

 corpuscles, 712. 



Amphistegina, 506. 



Amphitetras, 302. 



Anacharis alsinastrv.m,, formation 

 of cells in, 390, 391 ; cyclosis in, 

 391, 392. 



Anagallis, spiral vessels in petal of, 

 426. 



Androspores of ffidogonium, 333, 

 334. 



Anguillulce, 623. 



Angular Aperture of Object-glasses, 

 11, 14 — 16 ; means of determin- 

 ing, 172 note ; limitation of, for 

 Binocular, 38 — 40 ; real value of, 

 170—175. 



AnguliferecB, 302. 



Animalcule-Cage, 130, 153. 



Animalcules, 451 ; see Infusoria, 

 Rhizopoda, and Rotifera. 

 3 E 



