INDEX TO VOL. VI. 



N. B. New genera and species are in italics. 



AcADEMYjChicago, of Natural Sciences, 

 154. 



Acantheus Americaniis, Embrj^ology 

 of, 37. 



Acantlwtrias, nov. gen. Weinland, 300. 



Acarus of potato, 9. 



Acrocladia mammillatfl, 384. 



Africa, Native iron from, 279. 



African bulb, 127 ; gum, Analj-sis of, 129. 



Agalmatolite, Analysis of, 32. 



Agassi z's. Prof, notice of Johannes Miil- 

 ler, 382. 



Agelaius gubemator. Egg of, 149. 



Alabama, Peculiarities of Helix thyroi- 

 dus in, 129. 



Alasmodonta arcuata, cause of erosion 

 of, Discussion on, 258. 



Albino rats from Medford, Mass., 301. 



Albino Sciurus striatus, 218. 



Alca torda, 123. 



Alcoholic bevei-ages and their falsifica- 

 tions. Dr. A. A. Hayes on, 352. 



Alewife, Larvce of ttenia in, 25. 



Alga; from Australia, Ceylon and Friend- 

 ly Islands, 286; from California, 170. 



Algeria, races of, M. Bodiclion on, 383. 



Alternation of generation in Treraatoda 

 of Freshwater Snails, 24. 



Alum Stone from Texas, Maryland, 

 Analysis of, 245. 



Aluminium, 139, 159. 



Alycseus 2)ilula, Gould, 425. 



Amaranthus pumilus, 66. 



American Fossils, Oldest, 310. 



American Helices, Monograph on, 155. 



American works on Natural History in 

 Europe, 404. 



Ammodromus Samuelis, Baird, 379. 



Anableps Gronovii, development of, as 

 compared with that of Embiotoca, 

 Prof. J. Wyman on, 294. 



Analysis of Agalmatolite, 32 ; of Alum 

 Stone from Texas, Maryland, 245; 

 Deep River coal, 31 ; Black-band iron 

 ore, 32 ; Dolomite from Texas, Mary- 

 land, 244; Gum from Africa, 129; In- 

 fusorial earth, containing copper, by 



Albert Gould, 310; Magnetite from 

 Iron Mountain and Pilot Knob, Mis- 

 souri, by Edwin Harrison, 295; Ridge- 

 way Carbonate of iron, 18; Ridge- 

 way Coal, 17; Ridgeway Limestone, 

 18 { Scales of Striped Bass, 374 ; Som- 

 erville Slate, 108; Supposed Meteoric 

 Stone from Marblehead, Mass., by C. 

 T. Jackson, 294. 



Anas obscura, 119. 



Animal Kingdom, Series in, 112. 



Animals, Psychological view of their 

 motions, bv David Weinland, 160. 



Annual Meeting, May 6, 1857, 191. 



May 5, 1858, 370. 



Aphis ( Pemphigus) siamineus^Hald., 403. 



Aquarium, 365. 



Arachnides, Reproduction of, 285. 



Arctic Expedition, proposed by Dr. I. I. 

 Hayes, Action of Society on, 396; 

 Report on, 416; Vote on, 427. 



Ardea nycticorax at Hingham, Mass. 20. 



Artotrogus asterophora, 292. 



Ascaris lumbricoides, 177. 



Aspredo, Manner of gestation of, 269; 

 Aspredo levis, peculiar method of 

 hatching its eggs, 328. 



Assessment, Ainuial, Report on, 230. 



Astacus Klamath ensis, Stimpson, 87. 



niyrescem, " 87. 



Trowbi'idgii, " 87. 



Astraea decactis, Lyman, 261. 



Athene cunicularia, N. H. Bishop on, 

 204. 



Atlantic slope of Middle and Southern 

 States, Classification of Metamorphic 

 Strata of, 140. 



Atlantic and N. Pacific shells identical, 

 124. 



Atlas not united to Odontoid Process, 

 309. 



Australia and California, sands of, Re- 

 mark on, 228. 



Australia, Pigeon from, 169. 



Bagre, see Aspredo levis; Manner of 

 hatching its eggs, 268. 



