550 GENERAL INDEX. [36 
Penck’s Morphologie der Erdober- 
fliiche, ix, 429. 
Pendulum chronograph, Barus, viii, 
396. 
free, as time standard, Menden- 
hall, iii, 85. 
Pendulums for gravity measurements, 
use of planes and knife-edges in, 
Mendenhall, v, 144. 
Penfield, S. L., composition of auri- | 
chalcite, i, 106; 
notes, i, 394. 
minerals in spherulites of rhyo- 
lite, ii, 39. 
crystallography of cesium tri- 
halides, iii, 17; crystallographic 
crystallographic 
notes, iii, 184; crystallography of. 
rubidium and potassium trihalides, 
iii, 475. 
polybasite and tennantite from | 
Aspen, Col., iv, 15; crystallography 
of alkali-metal pentahalides, iv, 42; _ 
herderite from Hebron, Me., iv, 
114 ; erystallographic notes on alka- | 
line iodates, iv, 123; crystallogra- 
phy of double halides of silver and 
alkali-metals, iv, 155; crystallo- 
graphy of the cesium and rubidium 
chloraurates and bromaurates, iv, 
157; crystallography of czsium- 
mercuric halides, iv, 311; crystal- 
lographic notes, iv, 381. 
cookeite from Maine, v, 393; 
mineralogical notes, v, 396; pent- 
landite, Ontario, Canada, v, 493. 
eanfieldite, a new Germanium 
mineral, vi, 107 ; minerals from St. 
Marcel, Italy, vi, 288. 
chemical composition of stauro- 
lite, vii, 81; chondrodite,humite and 
clinohumite, vii, 188; willemite, 
vii, 8305; herderite, vii, 329; com- 
position and properties of topaz, 
vii, 887; argyrodite, vii, 451. 
determination of water, viii, 30; 
mineralogical notes, viii, 114, 141. 
optical properties of lithiophilite, 
etc., 1, 887; separation of minerals 
of high specific gravity, 1, 447. 
Penrose, R. A. F., manganese ores in 
Arkansas, ii, 516; Geol. survey of 
Arkansas, iv, 428. 
Pensig, O., Pflanzen-Teratologie, ix, 
78. 
Pennsylvania, geology, Lesley, iii, 
536; geol. survey, see Grou. RE- 
PORTS AND SURVEYS. 
Periodic law discussed, Hill, ix, 405. 
Perry, E. W., minerals from Snake 
Hill, New Jersey, i, 73. 
aa astronomical expeditions, iii, 
Peters, E. D., Jr., American methods 
of copper smelting, iii, 167. 
Petrographie, Zirkel, vi, 152; vii, 320; 
ix, 323. ; 
Paes Introduction to, Hatch, i, 
17; 
for students, Harker, 1, 425. 
|Phasemeter, Trowbridge, iii, 282. 
_Phelps, I. K., reduction of arsenic 
acid, viii, 216; determination of 
carbon dioxide, 1, 101. 
_Philippson, A., geology of the Pelo- 
ponnesus, ii, 173; iv, 79. 
Philosophical Society, American, v, 
527. 
Phinney, J. I., rubidium determined 
| by the spectroscope, iv, 392; bar- 
ium sulphate in analysis, v, 468. 
ie of auditoriums, Cutter, ii, 
68. 
_Phosphate deposits of Florida, Dar- 
ton, i, 102; Johnson, v, 497. 
nodules of South Carolina, Reese, 
iii, 402. 
_Phosphates of America, Wyatt, iii, 
79; of Florida, South Carolina, and 
Canada, Miller, iv, 342. 
Phosphorescence, Wiedemann, ii, 69 ; 
at low temperatures, Raould, Pictet 
and Allschul, ix, 152. 
Phosphorescent rays, penetration of 
Bren metallic screens, Lenard, v, 
Photochronograph, Marey, i, 70. 
Photo-electricity, Minchin, i, 326. 
Photographic sensitives, Vogel, i, 70. 
Orion, Lockyer, ix, 153. 
study of the movement of pro- 
jectiles, Neesen, v, 258. 
give erm Geschichte, Schiendl, 
i, 430. 
Photography, color, Lippmann, i, 326, 
iv, 75, 499, v, 68; Wiener, 1, 417; 
by indirect methods, Lumiére, 1, 
501; in color, Thwing, ii, 388 
Vogel, iv, 423. 
of Hertz spark, Emden, vi, 151. 
orthochromatic, Fabre and An- 
doyer, iii, 239. 
pin-hole, Rayleigh, i, 327. 
of the spectrum in color, Vogel, 
ii, 426. 
of ultra red rays, Higgs, i, 515. 
Photometer, for different colors, 
Mayer, vi, 1. 
Photometric method independent of 
color, Rood, vi, 173. 
’ 
spectrum of the Great Nebula in 
