ACKNO WLEDGMENTS. 



The following papers have been donated to the library of the Geological Depart- 

 ment of the University of Chicago. 



FROM THE PUBLISHERS. 



— The Interpretation of Nature, by Nathaniel Southgate Shaler, Professor of 

 Geology in Harvard University. Published by Houghton, Mifflin & Co., Boston 

 and New York. i6mo. 305 pp. 



— Deep-Sea Sounding, A Brief Account of the Work Done by the U. S. S. Enter- 

 prise in Deep-Sea Sounding during 1883- 1886, by Captain A. S. Barker, U. S. N. 

 Published by John Wiley & Sons, New York. 133 pp. 3 maps. 



MAINLY FROM THE AUTHORS. 



Hicks, Henry, M.D., F.R.S., Sec. G. S. 



— On Some Undescribed Fossils from the Menevian Group (with a note on the 

 Entomostraca by Professor T. Rupert Jones). 13 pp., 3 pi. — Quart. Journal Geol, 

 Soc, May, 1872. 



— On the Succession of the Ancient Rocks in the Vicinity of St. David's, Pem- 

 brokeshire, with Special Reference to those of the Orenig and Llandeilo Groups, 

 and their Fossil contents. 27 pp., 3 pi. — Ibid., May, 1875. 



— On the Metamorphic and Overlying Rocks "in the Neighborhood of Loch 

 Maree, Ross-shire. 8 pp.. 111.— Ibid., Nov., 1878. 



— Additional Notes on the Dimetian and Pebidian Rocks of Pembrokeshire (with 

 an appendix by T. Davies, Esq., F.G.S.). 16 pp., i pi. — Ibid., May, 1878. 



— On a new Group of Pre-Cambrian Pocks (the Arvonian) in Pembrokeshire 

 (with an appendix by T. Davies, Esq., F.G.S.). 16 pp.. 111.— Ibid., May, 1879. 



— Pre-Cambrian Volcanos and Glaciers. 3 pp. — Geol. Mag., Nov., 1880. 



— On Plant-Remains from Denbighshire Grits, Corwen, N. Wales. 16 pp.. 111., 

 I pi. — Quart. Jour. Geol. Soc, Aug., 1881. 



— Notes on Prototoxites and Pochytheca discovered by Dr. Hicks in the 

 Denbighshire Grits of Corwen, N. Wales. By Principal Dawson, LL.D., F.R.S., 

 etc.— Ibid., May, 1882. 



— Additional Notes on the Land Plants from the Pen-y-glog Slate-quarry near 

 Corwen, N. Wales. 6 pp., i pi. — Ibid., Feb., 1882. 



— On the Metamorphic and Overlying Rocks in Parts of Ross and Inverness- 

 shires (with notes on the Microscopic Structure of some of the Rocks by Professor 

 T. G. Bonney, M.A., F.R.S., Sec. G. S.) 28 pp.. 111., i pi.— Ibid., May", 1883. 



— The Succession in the Archaean Rocks of America, compared with that in 

 the Pre-Cambrian Rocks of Europe. 23 pp. — Proc. Geologists' Assoc, Vol. VIII, 

 No. 5. 



— On Some Recent Views Concerning the Geology of the Northwest Highlands 

 of Scotland. 23 pp.— Ibid., Vol. IX, No. 2. (1885). 



— On the Cambrian Conglomerates resting upon and in the vicinity of some 

 Pre-Cambrian Rocks (the so-called Intrusive Masses) in Anglesey and Caernarvon- 

 shire. 14 pp. — Quart. Jour. Geol. Soc, Feb., 1884. 



— On some Rock Specimens collected by Dr. Hicks in Anglesey and N. W. 

 Caernarvonshire. By T. G. Bonney. 8 pp. — Ibid., Feb., 1884. 



— Further Proofs of the Pre-Cambrian Age of Certain Granitoid, Felsitic and 

 other Rocks in N. W. Pembrokeshire. 13 pp. Ibid, Aug., 1886. 



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