I4 RESEARCH IN CHINA. 
For altitude above sea the elevation of Wu-shan-hién, 64 meters as deter- 
mined by our aneroid barometers in comparison with Shanghai, was adopted 
and applied to all the elevations for which the differences had been deter- 
mined in the course of the survey from Hing-an-fu. 
The traverse from Hing-an-fu to Wu-shan-hién was 278 kilometers long, 
209 kilometers being made on foot and 69 by boat. 627 stations were 
occupied, 412 points intersected, and 756 square kilometers mapped. ‘The 
work, which was begun on May 16, was completed on June 6, 203 days 
having been spent in actual field work. 
MAGNETIC DECLINATIONS. 
Observations for magnetic declination were made from time to time 
in connection with the observations for azimuth. The method employed 
was that in use by the topographic parties of the United States Geological 
Survey. The true azimuth having been ascertained, and a line correspond- 
ing to it drawn upon the plane-table,a special box compass is set in the 
magnetic meridian and a line is drawn along its edge to intersect the true 
meridian. The angle between the two lines then represents the magnetic 
declination. The following is a tabular statement of the positions and 
amounts of the magnetic declination. 
The results have been considered by Professor L. A. Bauer, chief of the 
magnetic work of the Carnegie Institution of Washington, and we are 
indebted to him for suggestions in regard to determining the index 
error of the compass. 
VALUES OF MAGNETIC DECLINATION IN CHINA. 





Date Latitude gists: Approximate ea Atlas 
1904. north. (ispioreh. local time. tion (west) sheet. 
te} / ° / h ° , 
Jume 5 31 o9 10g 55 6. pat: Oo 59 er 
z 3 BT A o22 109 40 10 a.m. aie iste, d7 
May 17 2 39 109 O05 10 a. m. O59 c4 
eho 33° (02 108 19 10 a. m, I oo a3 
Mar. 7 38 00 I12 26 4% p.m. EF B58 AIll 
i‘ 6 38 04 T1237 5, ps I I 45 BIII 
Feb. 29 Si) 15 1128 50 4 p.m. Lowes BII 
Mar. 8 38 20 112 48 II a.m. ii Ge! Bil 
Feb. 14 38 38 Ela 20 4y p.m. 2 46 Ci 
i WS ce) 38 42 103 ur 4 p.m. 2) 26 aL 
eats 30), 4g 113 20 12 (noon) 2) 29 Cl 
cal Bais 38°-46 || eariepeed 12 (noon) Zaye CL 
Jan. 2 38 50 Crs 40 5 p.m. Se Te) LTS | 
Feb. 5 38 58 ¥31 30 44 p.m. AMO te Cr 






* At this station, upon trial, it was found that the rock formation was sufficiently magnetic to 
give rise to local disturbance. 
