52 Report of the U. S. Coast Survey for 1883. 
in 1874. The number of stars in the old catalogue was 983, 
while in this one there are 1278, and the epoch is 1885-0. 
The final appendix, No. 19, is on gravity determinations at 
Alleghany, Ebensburgh and York, Pennsylvania, in 1879 and 
1880, by Asst. C.S. Peirce. From notes in the midst of the 
paper we learn that this is only a part of a separately printed 
paper on the same subject in which the details are given. For 
an understanding of the method of obtaining results reference 
must be had to previous publications by the same author. 
The resulting length of the seconds-pendulum, expressed in 
meters, at the three stations of which the paper treats are as 
follows : 
PUORH ANY 5 lols aon a ako 0™:993 0308 
Ebensbargh': 22s 225..c250% 0 993 0244 
SOrk cies 0 °993 053 
the’ latter determination being less strong than the two 
preceding. . 
We have looked with interest to these results to learn 
whether a station, as Ebensburgh on the crest of a mountain 
chain and more than 2000 feet above the sea-level, would 
reveal an excess or er, ss gravity, but upon this matter 
the author makes no statem 
The sketches at the close “of ‘the volume revealing the pro- 
gress of the survey during the year are prepared from pa 
which have seen service many years, and this fact appea 
ye 
in a variety of ways, particularly in the titles of which the lata 
are much improved in appearance over the earlier ones. 
navigation. In the sanutiie value and resets) ete of the 
papers published in the Appendices, the Report compares well q 
with its predecessors. 
Es soe ee ee 
