Recent Publications. 311 
History of geological surveys in Minnesota. By N. H. Winchell. 
Bulletin No. 1 of the Minnesota survey, pp. 37. 1889. 
o. Papers in scientific journals. 
Am. Naturalist. May No. Soleniscus : its generic characters and 
relations. Chaki.es R. Keyes. 
The Am. Antiquarian, Sept. No., has a paper by T. H. Lewis on 
Copper mines worked by the mound-builders. 
Am. Jour. Sci. Sept. No. Carboniferous echinoderraata of the Mis- 
sissippi basin. Charles R. Keyes. Contributions to mineralogy. 
F. A. Genth. Period of rotation of the sun. H. Crew. Grand Gulf 
formation of the Gulf states, L. C. Johnson. Note on the fossil 
spider Arthrolycosa antiqua of Harger. C. E. Beecher. Paragenesis 
of allanite and epidote as rock-forming minerals. W. H. Hobbs. New 
locality of the camptonite of Hawes and Rosenbusch. F. L. Nason. 
Properties of allotropic silver. M. C. Lea. Ring systems and other 
curve 8y.stems produced on allotropic silver by iodine. M. C. Lea. 
Notes on some native iron sulphates from Chili. J. B. Mackintosh. 
Oct. No. Origin of normal faults and of the structure of the basin 
region. J. LeConte. Circular polarization of certain tartrate solu- 
tions. (II). J. H. Long. Some suggestions upon the metliod of 
grouping the formations of the middle Cretaceous, and the employ- 
ment of an additional term in its nomenclature. G. H. Eldridge. 
Some Florida Miocene. D. W. Langdon, Jr. 
4. Excerpts and Individual Publications. 
Palteolitliic -man in eastern and central North America. (Part lu). 
Reprinted from Bos. Soc. Nat. Hint. vol. xxiv. Embraces early man 
in the Delaware valley ; The rock-shelter of Naaman's creek ; Pakeo- 
lithic implements from the Delaware gravels. By Hilborne T. Cresson. 
p. 141. — Implement from the Indiana gravel. By Hilborne T. Cresson. 
p. 150. — The age of the Philadelphia red gravel. G. Frederick Wright. 
p. 152. — Water-worn implements from the Delaware river. By 
Charles C. Abbott, p. 157. — Concluding remarks by the president with 
illustrations of palaeolithic implements from Delaware, Indiana, New 
Jersey and Minnesota. By F. W. Putnam, p. 158. 
On the paragenesis ot Allanite and Epidote as rock-forming min- 
erals. By W. H. Hobbs, Ph. D. Am. Jour. Set. Sept 1889. 
Nova Scotian Echinodermata. D. Honeyman. Halifax. 
Note on the fossil spider Arthrolycosa anticjua Harger. By Charles 
E. Beecher. Am. Jour. Sci. Sept. 1889. 
The mineralogy of Pennsylvania. Part i. By John Eyerman. 
Easton, Pa. 
Notes on geology and mineralogy. By John Eyerman. Proc. Acad. 
Nat. Sci. Phil. Feb. 1889. 
On the mineralogy of the French creek mines, Pennsylvania. By 
John Eyerman. Trans. N. Y. Acad. Sci. Jan. 14, 1889. 
The rivers and valleys of Pennsylvania. Win. M. Davis. From the 
National Geographic Magazine. Vol. 1, No. 3. 
