INDEX TO VOL. XXI. 
Acadexny of ScioucBSof St. Louis, 397. 
.Account of tlio Researches relating to 
the Great Lake.*, .f. W. Spencer, 110. 
Additional Note on the Oceanic Current 
in tlie Utica Epoch, R. Ruedemann, 7.>. 
Aftonian and Hre-Kansan Deposits in 
Soutliwestern Iowa. H. Foster Bain, 
2.55. 
Agassiz. Alexander, 3::!1. 
.\laska. Government Exploration in, 265. 
Alaska, Reconnaissance of the Gold 
Fields of Southern, G. F. Becker, 382. 
American Association for tlie Advance- 
ment of Science, 331, 
Anthracite (^oal in Arizona, W. P. Blake. 
345. 
.Archean character of the Nucleus oi tlie 
.Antilles, Persifor Frazer, 250. 
Archean of Minnesota and of Finland, 
Some Resemblances between the, N. H. 
WinchfU, 222. 
Augusta in (ieology, Use of tlie Term, 
C. R. Keyes, 22'). 
Australian Tertiary Mollusca. G. F. 
Becker, 383. 
Autliors' Catalogue, Montldy, CS, 131, 
192, 245, 32"., ;fS7. 
B 
BfickstrOni, Helge, Vest&nal'altet: En 
i'etrogeuetisk Studie, :i)S5. 
Bain, H. F., Drift in .Southwestern 
Minnesota and Northwestern Iowa, 
136; Aftonian and Pre-Kansan Depos- 
its in Southwestern Iowa, 255. 
Baker, Marcus. :i32. 
Batesvillc Sandstone of .Arkansas, Stu- 
art W.dler, 12ii. 
Becker, (i. F., Ri-connaissanct^ of the 
Gold Fields of Southern Alaska, 382; 
Australian Tertiary Mollusca, :K{. 
Ben -Nevis, tlie Last Stronghold of the 
Hritisli Ice-Sheet, Warren Upliam, :i75. 
Berkey, C. P., Geology of the St. Croix 
Dalles, 139, 270. 
V,\:\k(\ W. P. 3:«); Anthracite Coal in 
Arizona, :^45. 
Brigliain, .\. P., Notn on Trellised Drain- 
age in the .\dirondacks, 219. 
Broad head, G. ('.. Sketch of Maj. Fred- 
c-rick Hawn, 267. 
Brodle, P. B., 74. 
Calvin, S., ()4 ; :iSi; Interglacial Deposits 
of .Nortliwestern Iowa. 251. 
Carl)i)iiili'i()us Formations of Southwest- 
ern luw.i.C. R. Keyes, :i46. 
Case of (ieolog cmI Parasitism, 12.!. 
Cat.ilogue of tlic Tertiary Mollusca in 
tlii^ D •partmrnt of Geologv, Britisli 
Museum, I't 1. I'hi' .'iustralian Torti- 
.-irv Mollusca. (1. F. Harris. IKi. 
Certain Resemblances between the -Arch- 
ean in Minnesota and in Finland, N. H. 
Wiuchell, 136; 222. 
Champlaiu Subm.rg^ince in tlie Narra- 
gansett Bay Region, M. L. Fuller, 310. 
Clay and Kaolin Deposits of Europe, 
Heinrich Ries, 266. 
Clavpolo, E. W., Paleolith and Neolith, 
333. 
Coal in Arizona, -Anthracite, W. P. Blake, 
345. 
Contact Metamorphism of the Palisades 
Diabase, J. D. Irving, :fflS. 
Copper in Lake Superior Iron M ines, ;j31. 
Correlation of -Moraines with Beaches ou 
the Border of Lake Erie, Fiank Lever- 
ett, li<9. 
Correspondence. 
The Meclianical -Action of the Divining- 
Rod, M. E. Wadsworth, 72. 
Zirkelyt(^: .A Question of rriorit\,M. 
E. Wadsworth, 133. 
Correlation of Moraines with Beaches 
on the Border of Lake Erie, F. Lev- 
erett. 199. 
A New Well at Rock Island, Ills., J. A. 
Udden, 199. 
.Archean Character of the Nucleus of 
the -Antilles, Persifor Frazer, 2.50. 
The Interglacial Deposits of North- 
eastern iowa, .Samuel Calvin, 251. 
Tlie Weathered Zone (Yarmouth) be- 
tween the Illinoian and Kansan Till 
Sheets, Frank Leverett, 254. 
The Weathered Zone (.Sangamon) be- 
tween the lowaii Loess and Illinoian 
Till Sheet, Fraidc Leverett, 254. 
The Aftonian and Pre-Kansan Deposits 
in Southwestern Iowa, H. F. Bain, 
2.55. 
Some Preglacial Soils. J. A. Udden, 262. 
On the Formation of New Ravines, 
Ell win Linton, 329. 
On Mr. Frank Leverett's "Correlation 
of Moraines with Readies on the 
liordor of Lake Erie," .1. W. Spencer, 
:«3. 
Cote Sans Dessein ami (iraiid Tower, C. 
f. Marbut, 86. 
Cummins, Edgar R., 74. 
Darton, N. H., Developments in Well 
Boring and Ir.igation in Ea.storii 
.South Dakota. ;{25 
Day, D. T., Mineral Resources of the 
United States, 1S9'\ :«0. 
Des Cloiseanx, A.,:«2. 
Determination of the Feldspars, N H. 
Witicliell, 12. 
Dodge, R. E.. ScieiitiMc (ieugraphy in 
Ediir.it ion, 201. 
Drainage in the .Vdirondacks, Note on 
Trellised, A. P. Brigiiam, 219. 
