Recent Publications. 197 
The May-June No. contains: On the Typical Laurentian Area of 
Canada, F. D. Adams; Melilite-Nepheline-Basalt and Nephehne-Basan- 
ite from Southern Texas, A. Osann; Some Dynamic Phenomena shown 
by the Baraboo Quartzite ranges of Central Wisconsin, C. R. Van Hise; 
The Chemical Relation of Iron and Manganese in Sedimentary Rocks, 
R. A. F. Penrose; Some Rivers of Connecticut, H. B. Kummel. 
The Geological Magazine for July, 1893, contains: The Volcanoes of 
Barren Island and Narcondam, V. Ball; on the British Earthquakes of 
1892, C. Davison; On the Arctic Lands, Sir H. H. Howorth; The Growth 
of the Indian Peninsula, P. Lake; The Relative Age of Flints, A. J. 
Jukes-Browne; New Classification of Brachiopoda, Miss A. Crane; The 
Cause of Crateriform Sand-Dunes and Cwms, Wm. Shone. 
National Geographic Magazine, Vol. V, July, 1893. contains: The 
Natural Bridge of Virginia, C. D. Walcott; The Geologist at Blue 
Mountain, Md., C. D. Walcott; Our Youngest Volcano, J. S. Diller. 
Amer. Jour. Science, Vol. XLV, March, 1898, contains: Diversity of 
the Glacial Period, T. C. Chamberlin; Stratigraphic Relations of the 
Oneonta and Chemung Formations in Eastern Central New York, N. H. 
Darton; Estimates of Geologic Time, Warren Upham. 
The April No. contains: A Basic Rock near Hamburg, Sussex Co., 
N. J., w T hich has been thought to contain Leucite, J. F. Kemp; The Creta- 
ceous formations of Mexico and their relations to North American Geo- 
graphical Development, R. T. Hill. 
The May number contains: Note on some Volcanic Rocks from 
Gough's Island, South Atlantic, L. V. Pirsson; Champlain (?) Deposits 
of Diatomacete belonging to the Littoral Plain, A. M. Edwards; The 
Magothy Formation of Northeastern Maryland, N. H. Darton; Lime 
and Alumina-bearing Talc, W. H. Hobbs. 
The June No. contains: Nikitin on the Quaternary Deposits of Rus- 
sia and their relations to Prehistoric man, A. A. Wright; Rigidity not 
to be relied upon in estimating the Earth's Age, O. Fisher; Validity of 
so-called Wallala Beds as a division of the California Cretaceous, H. W. 
Fairbanks; Notes on the Geology of Florida: Two of the lesser but typ- 
ical Phosphate Fields, L. C. Johnson. 
Amer. Jour. Science, Vol. XLVI, July, 1893, contains: The Galveston 
Deep Well, E. T. Durable and G. D.Harris; Piedmontite and Sheelite 
from the Ancient Rhyolite of South Mountain, Pa., G. H. Williams; 
Cambrian and Ozark Series, G. C. Broadhead; Cross Roads Meteorite, 
E. E. Howell. 
The August No. contains: On Mackintoshite, a new thorium and 
uranium mineral, Wm. E. Hidden; Cantieldite, a new Germanium Min- 
eral, and on the Chemical Composition of Argyrodite, S. L. Pentield; 
Epeirogenic Movements associated with Glaciation, W. Upham; Anten- 
na? and other Appendages of Triathrus Beckii, W. 1). Matthew: Larval 
Forms of Trilobites from the Lower Helderberg Group, C. E. Beecher. 
IV. Excerpts and Individual Publications. 
Note on the Nufenstock (Lepontine Alps), Prof. T. G. Bonney. Quar. 
Jour, of the Geol. Soc. for Feb., 1893, Vol. XLIX. 
