Author's Catalogue. 39/, 
UDDEN, J. A. 
Geology of Jefferson county. (Iowa Geol. Sur., 1901, vol. 12, pp. 
355-437.) 
WALCOTT, C. D. 
In memory of John Wesley Powell. (Science, vol. 16, Nov. 14, 
1902, p. 785.) 
WHITFIELD, R. P. 
Notice of a new genus of marine Algae, fossil in the Niagara 
shale. (Bull. Am. Mus. Nat. Hist., vol. 16, pp. 399-400, pi. 53, Nov. 
3, 1902.) 
WHITLOCK, H. P. 
Guide to the mineralogic collections of the New York State Mu- 
seum. Bull. No. 58, New York State Museum, pp. 147, Albany, 1902. 
WILDER, FRANK A. 
Geology of Webster county. (Iowa Geol. Sur., 1901, vol. 12, pp. 
63-235.) 
WILSON, A. W. G. 
Some recent folds in the Lorraine shales. (Can. Rec. Sci., vol. 
8, July, 1902, p. 525-531.) 
WILLISTON, S. W. 
An arrowhead found with bones of Bison occidentalis Lucas in 
western Kansas. (Am. Geol., vol. 30, Nov. 1902, pp. 313-315.) 
CORRESPONDENCE. 
Additions to the list of Nicaragua volcanic eruptions in his- 
toric TIME. On reviewing the list of volcanic eruptions and earth 
quakes in Nicaragua — mailed to you on 28th June 1902 — I fear that I 
■overlooked a few important ones — as follows: 
i6og. Momotombo, in violent action accompanied by severe earth- 
quakes, lasting for several days, covering to a depth of several f'-ct 
with ejecta the ancient city of Leon, then the capital of Nicaragua, at 
the N. W. base of the volcano, o.t the western margin of lake Man- 
agua : The capital was removed to the present site about 40 miles 
to the S. of W. and about 18 miles from the Pacific ocean : Fragments 
of records of this eruption also of the marriage there in 1608 of the 
cacique of the Ameriques were in the archives of the "Palacio Epis- 
copale" in the present city of Leon in 1890. 
1648. Strong earthquakes in western Nicaragua, doing much dam- 
age to the tha.T new city of Leon, killing several persons and injuring 
man}' : These earthquaqes were probably from Momotombo. 
1651. Earthquakes very violent in western Nicaragua. 
1663. Earthquakes in series, very violent, destroying houses and 
lives that were near to volcano Momotombo and westward to the Pa- 
cific; also violent about the city of Granada on western side of lr\ke 
Nicaragua : The cause of that series of earthquakes also elevated *:ho 
bed of the Rio San Juan, the outlet of the waters of lake Nicaragua, 
