142 J. STAXLEY-BROWN INDEX TO VOLI'ME^ 21 TO 30 



iLLt'STRATioN'K of iiitraforiiiiitioiial cornv^ation ; J. ^I. Clarke 25,37 



the (l(»r(innati()ii of limestone uiuler re.iiioiial coiniu'essiou ; I). II. 



NewlniKl 28, 163 



ivceut exjiosure of the Saratoga Springs; J. M. Clarke 25,38 



iLMENiTK-APATrn; ,i;al)hro 27. --S 



Imperial ^Mineral Resourees IJureaii. Loudon. England; W. U. Miller. . 30,100 

 Importance of "eoral reefs" and reef deposits in the formation of Paleo- 

 zoic linicstoiit's : 'I'liomas ( ". IJrowii 27. HT 



nivation as an erosive factor and of soil tlow as a transporting' 



a.iKMicy in northern Greenland ; W. F^. Ekhlaw 29, 72 



water as a niaiimatic constitnent ; George W. Morey 27. oO 



Improvements in methods of investigating highly carhonized materials 



and their hearing on the mode of deiK)sition of coal ; E. C. Jeffrey 25, ^8 

 iNCET'sioN of the Pleistocene period in the Psychozoic era ; A. W. Grahau 



30. 149 

 iNDEX-EiJ.iPsoii) in ](etrogra])hic-micr()scopic work: F. E. Wright... 24. •~)3, 681 



Index to Ulrich's Revision of the Paleozoic systems 24. 625 



iNuiA. Climatic changes in 25. 481 



— , I'etroleum snpply of 28. 614 



IXDiAN :\Ieteoi-ological Department cited on climatic chaiii^'es 25. 481 



— Reservation, Geologic map of Fort Hall 27. 64 



Indiana, Natnral bridge at Attica 21. 317 



— , Oil fields of 28. I-jG, 561 



— , Oil i)rodnction in 28. 667, 669 



— : Uplift in 29. 201 



Influence of Silnrian-Devonian climates on the rise of air-breathing 



vertebrates ; Joseph Barrell 27. 40, 387 



Infundibular diaphragms 26, 351 



Inorganic prodnction of oolitic sti'nctures ; W. 11. Ihicher 29. 103 



Insectivora ; William K. Gregory 23. 192 



Interglacial beds. Earliest 25. 71 



, Lethbridge, Alberta 24. 5.12 



— deiK)sits in other places than the Don and Scarboro beds 26, 251 



— epoch in Pritish Isles and in T'nited States 25. 213 



— period. Climatic conditions during Aftonian 21, 120 



, Length and character of the earliest ; A. P. Coleman 26, 243-2.54 



— time. Length of 26. 2.52 



Interior ])rovince, Cretaceous sedimentation of the 25. 343 



(Illinois and Missouri coal Helds), I'ottsville-Allegheny boundary 



in the 24, 75, 716 



Intermolecular attractions ami oil and gas accumul.ition ; E. W. Shaw 28. 158 



Internal structures of igneous rocks ; F. F. (ii-out 29. 100 



International geological excursion in 1913, Reference to 27. 113 



Internationalization of mineral resources : C. K. Leitli 30. 107 



Interpretation of sedimentary rocks, Symposiinii on 28. 735 



Intraformational corrugation. Illustrations of 25. 37 



— structure in the Ordovician limestone of central I'ennsylvania ; R. M. 



Field 28, 166 



