INDEX. 



ABBE, Prof., on Homogeneous immer- 

 sion, i. 17; on Diffraction spectra, 

 i. 156-160; on Penetration of objec- 

 tives, i. 163 note; on Numerical aper- 

 ture of objectives, ii. 327; on Aper- 

 tometer, ii. 327. 



Aberration, Chromatic, i. 8, 9. 

 Spherical, i. 6, 7. 



means of reducing and cor- 

 recting, i. 7-14. 



Absorption bands, i. 89-93. 



-Acalephs, see Medusce. 



Acanthometrina, ii. 113. 



Acarida, ii. 248, 249. 



Achlya prolifera, i. 251, 253. 



Achnanthes, i. 296, 297. 



Achromatic Condenser, i. 102, 103; use 

 of, i. 144, 145. 



Achromatic Correction, i. 10, 11. 



Achromatic Objectives, see Objectives. 



Acinetina, ii. 39, 40. 



Acrocladia, spines of, ii. 143. 



Actinia, ii. 135; thread-cells of , ii. 135, 

 136. 



Actinocydus, i. 291. 



Actinomma, ii. 113. 



Actinophrys, ii. 10-12. 



Actinoptychus, i. 292. 



Actinosphcerium, ii. 13. 



Actinotrocha, ii. 198. 



ACTINOZOA, ii. 134-137. 



Adjustment of Focus, i. 82, i. 137-139. 



Adjustment of Object-glass, i. 11-15; 

 i. 139-141. 



^Ecidium tussilaginis, i. 324. 



Agamic eggs, of Rotifera, ii. 58-60; of 

 Entomostraca, ii. 210, 211; of Insects, 

 ii. 246, 247. 



Agrion. circulation in larva of, ii. 238. 



Air-bubbles, microscopic appearances 

 of , i. 152; in microscopic preparations, 

 i. 198, i. 216-217. 



Albuminous substances, tests for, i. 

 208, 209. 



Alburnum, i. 364, 370. 



Alcohol, as hardening agent, i. 202; as 

 test, i. 209. 



Alcyonian Zoophytes, ii. 136, 137. 



Alcyonidium, ii. 161. 



ALGJE, higher, microscopic structure of, 

 i. 331-335 (see Protophyta). 



Allman, Prof., on Sarcode organisms, 

 ii. 22 note; on Noctiluca, ii. 34; on 

 Peridinium, ii. 37; on Myriothela. 

 ii. 122; on Tubularida, ii. 129 note; on 

 fresh- water Polyzoa, ii. 162 note; on 

 Appendicularia, ii. 169, 170. 



Alternating Circulation of Ascidiaris, 

 ii. 166, 168. 



Alternation of Generations, ii. 134. 



Alveolina, ii. 73. 



Amaranthus, seeds of, i. 386. 



Ambulacral disks of Echinida, ii. 141. 



Amici, Prof., his early construction of 

 Achromatic lenses, *i. 11, 15; his in- 

 vention of the immersion system, i. 

 16; his drawing Camera, i. 97; his 

 Prism for oblique illumination, i. 106. 



Amoeba, ii. 15-17. 



Amceboids of Volvox, i. 244; of proto- 

 plasm of Chara, i. 262 note; of proto- 

 plasm of roots of Mosses, i. 339; of 

 Myxomycetes, i. 326; of Sponges, ii. 

 117-119; of Polypes, etc., ii. 122, 123; 

 of colorless Blood-corpuscles, ii. 271. 



Amoroucium, ii. 165. 



Amphipleura pellucida, resolution of, 

 i. 171. 



Amphistegina, ii. 91. 



Amphitetras, i. 295. 



Amplifiers, i. 86. 



Anacharis alsinastrum, formation of 

 cells in, i. 356; cyclosis in, i. 356, 357. 



Anagallis, petal of, i. 383. 



Androspores of (Edogonium, i. 258. 



Angle of Aperture, i. 8; limitation of, 

 for Binocular, i. 35-38; its relation to 

 Angular Aperture, i. 160 note; to 

 Numerical Aperture, ii. 327. 



Anguillulce, ii. 193. 



Angular Apperture of Object Glasses, 

 i. 160 note; its relation to resolving 

 power, i. 157, 163; its real meaning, 

 ii. 327; limits to its value, Preface, v. 



Anguliferece, i. 295. 



Aniline dyes, as staining agents, i. 206. 



Animal Tissues, formation of, ii. 252- 

 255. 



Animalcule-cage, i. 123. 



ANIMALCULES, ii. 24 (see Infusoria, 

 Monerozoa, Rhizopoda, and Rotifera). 



Animals, distinction of, from Plants, 



