1 08 
The American Geologist. 
December, 1905. 
viimis of Philadelphia, (ed. com.), 
xxvi, 391; Ditto, S. H. Hamilton, 
xxvii, II; Buried valley of Wy- 
oming, \V. Griffith (rev.), xxviii, 
324; Fossils near Ackley station, 
C. K. Beecher, xxix. 143; Notes 
upon the Mauch Chunk, J. J. 
Stevenson, xxix, 242; Kansas 
glaciation, E. H. Williams, Jr., 
(rev.), xxxii, 253; Fossil fauna of 
Devonian sections, H. S. Wil- 
liams, (rev.), xxxvi, 49. 
Pe'eliths (ed. com.), xxxlli, 319. 
Pembina region, economic geology, 
C. P. Berkey, xxxv, 142. 
Penck, A., (cit.), xx, 197; (p.s.n.), 
xxxv. 84. 
Peneplain, R. S. Tarr, xxl, 351; 
P neplain W. M. Davis, xxiil, 
207. 
Peneplains, of the Ozark High 
1 mils, O. H. Hershev, xxvli, 25. 
Pen field, S. L. (and J. S. Pratt,) 
SI Lurolite, (rev.), xiii, 285; Crys- 
tallization of herderite, (rev.), 
xiii, 427; (and J. C. Minor, Jr.,), 
Topaz, (rev.), xiii, 427; (and W. 
T. H. Howe), Chondrodite, hu- 
mite and clinohumite, (rev.), xiii, 
358; Argyrodite and a new sul-> 
I hostanate (rev.), xiv, 53; (and 
Brush), Determinative Mineralo- 
gv, (rev.), xviii, 391; (and C. H 
Warren,), New Minerals from 
Franklin, N. J., (rev.), xxv, 174; 
Determinative mineralogy and 
blowpipe analysis, (rev.), xxii, 
228: Giaftonite and its intergrowth 
with Triphyllite, (rev.), xxv, 176; 
Giaftonite, its intergrowth with 
Triphyllite, (rev.), xxvi, 393; 
Chemical composition of Tur- 
quoise (rev.), xxvii, 50; of sul- 
phohalite, (rev.), xxvii, 50; Sili- 
ceous calcites, (rev.), xxvii, 51; 
Mineralogy and petrography, 
Sheffield scientific school, (rev.), 
xxviii, 322. 
Penfieldite, (rev.), x, 327. 
Pengelly, W., (obit.), (ed. com.), 
xiv, 43. 
Fsnhallow, D. P., Parka decipiens, 
(rev.), ix, 341; New Species of 
Cannel coal from the Kootanie, 
x, 331; Interglacial plants of the 
Don valley, xiii, 93. 
Penokee iron-bearing series of 
Michigan and Wisconsin, Irving 
and Van Hise, (rev.), ix, 207; 
[rving and Van Hise, (rev.), xv, 
326. 
Penrose, R. A. F., (p.s.n.), vt II, 
194; Manganese and its uses, 
(rev.), viii, 261; Iron deposits of 
Arkansas, (rev.), x, 324; (cit.), 
xiii, 361; (p.s.n.) xxyii, 328; 
(p.s.n.), xxxiii, 64. 
Percentages of components of an 
igneous rock, J. A. Williams, 
xxxv, 34. 
Periodic variation and glaciation 
H. F. Reid, (abs.). xxii, 265. 
Periode Glaciaire, Falsan, (rev.'). 
vi, 52. 
Peripheral phases of the gabbro in 
Minn., W. S. Bayley, (rev.), xv, 
67. 
Perisho, 10. ("., (p.s.n.). xxxli, 331. 
Perisomic plates of the Crinoids, 
Wachsmuth and Springer, (rev.) 
vll, 255. 
Perkins, G. H., Sketch of Zadock 
Thompson, xxix, 65; Geology of 
Vermont, (rev.), xxxi, 122. 
permanence of ocean basins, E. 
H. L. Schwarz, (rev.), xxxvi, 126. 
Permian in Texas (rev.), viii, 121; 
Glacial invasion, R. S. Bast in. 
xxix, 169; Question in America, 
C. R. Keyes, xxxii, 18; Fish. 
Menaspis, B. Dean, xxxiv, 49; 
Formation of Kansas, C. S. Pros- 
ser. xxxvi, 143; Kansas, Beedc 
and Sellard, xxxvi, 83. 
Permo-Carboniferous of Kansas, L. 
C. Wooster, vi, 9; glaciation in 
Australia? T. W. Edgworth Da- 
vid, (rev.), xviii, 188. 
Perry basin in southeastern Maine\ 
Smith and White, (rev.), xxxvi, 
127. 
Perry, N. W., Physical history of 
the Cincinnati rocks, Iv, 326. 
Perry, S. H., Classification of topo- 
graphic forms, xli, 153. 
Perry, J. H., and B. K. Emerson, 
Geology of Worcester, Mass., 
(rev.), 'xxxiii, 122; (p.s.n.), xxxlv, 
333. 
Peru, Economic geology in, V. F. 
Marsters, xxxvi, 265. 
Peters, W. J.. (D.s.n.), xxxiii, 270. 
Peterson, O. A. (p.s.n.), xxxiv, 268. 
Pettee, W. H., (obit.), xxxlv, 67; 
'Biographical sketch of, I. C. Rus- 
sell, xxxv, 1. 
Petrographical sub-divisions of the 
Archean, (Am. com.). il, 159; 
microscopes of American make, 
N. H. Winchell, iii, 225: differ- 
entiation of dvkes, A. C. Law- 
son, vll, 153; Tables, A. C. Lane, 
vii, 337; Province of Essex coun- 
ty, Mass. H. S. Washington, 
(rev.), xxiv, 256; Notes on rocks 
from the Fiji Islands, A .S. Eakle. 
(rev.), xxiv, 3015. 
petrographisches praktikumi R. 
Reinish, (rev.), xxix, 179. 
3 etrography, microscopical, A. Win- 
chell, iii, 57; summary of prog- 
ress in 1895; W. S. Bayley. (rev.), 
xvii, 335; Progress in 1896, Bay- 
ley, (rev.), xix, 350; of Mt. Or- 
ford. J. A .Dresser, xxvii 14; of 
Shefford mountain, J. A. Dresser, 
xxviii, 203; of the John Day Ba- 
sin F. C. Calkins, (rev.), xxxl, 
54. 
Petroleum and natural gas in N. 
Y.. Ashburner, (rev.), il. 430; 
Orign of, (ed. com.), Iv, 371; in 
Penn., (p.s.n.), v. 127;,' Gaspe, 
Quebec, H. P. Brumell, (abs.), 
xi, 131; Ditto, Selwyn, 1«L in 
Gaspe, in Quebec, H. P. Brumell, 
(rev.), xii, 120; Genesis of bitu- 
mens, S. F. Peekhan. (rev.), 
xxiii, 327; Inclusions in nuartz, 
C. L. Reese, (rev.), xxlil, 328; in 
Ohio, Occurrence and exploita- 
tion, J. A. Bownocker, (rev.), 
xxxiv, 261; Chemistry of, P. W. 
