ON SEISMOLOGICAL INVESTIGATIONS. 85 
Baltimore, Md., U.S.A. 
Lat., 39° 17’ 8" N.; long., 76° 37’ 25" W.; alt., 100 feet. 
Foundation is on brick pier, built nearly thirty years ago, on sands and clays. 
Topographical Situation.—On a hilly plateau. 
Geological Structure.—Sands and clays, about 60 feet thick at this point, rest on 
an irregular surface of crystalline rock dipping toward the south-east. The water- 
level is about 50 feet from the surface. 
Time-heeping.——My clock is checked weekly by means of a sidereal clock. My 
clock does not keep very good time. 
HARRY FIELDING REID. 
Batavia. Royal Magnetical and Meteorological Observatory. 
Lat.,6° 11’ 6" S.; long., 7h. 7m. 19s. E.; alt.,8 M. 
Foundation is on brick pillar. 
Topographical Situation.—F lat country. 
Geological Structure —Alluvium.' 
Time-heeping.—An electrical signal is given hourly by an observer from the 
astronomical clock, controlled monthly by observation of the sun. 
Dr. 8. FIGEE, Director. 
Beirit Protestant College, Syria. 
Lat., 33° 54’ 20" N.; long., 35° 28’ 10’ H.; alt., 105 feet. 
Foundation is on solid rock. 
Topographical Situation—The general trend of the coast ridge, which has an 
altitude of 2,000 feet, is N.N.E.-S.S.W. At Beirit a limestone spur juts out about five 
miles due west. ‘It was, doubtless, once an island. It is now joined with the mainland 
by a narrow alluvial plain, and the space to the south is filled in bya late formation 
derived from shifting sand. Along the northern face of this spur there is a ledge, 
averaging 100 yards wide, about 10 feet above sea-level; then asudden rise to a terrace 
100-140 feet above sea, with a further rise to the highest part of the ridge, 500 yards 
back, the height of which is 225-300 feet. The Observatory is at the very edge of the 
middle plateau, about 400 yards from its western extremity, and is about 100 yards 
south of the seashore, which is rocky. Six miles to the east the first ridges of 
Lebanon rise to an altitude of 2,500 feet, with the main ridge, 15-20 miles further, 
rising to 5,000-8,700 feet. 
Geological Structure.—Stratified limestone (tertiary), of unknown thickness, but 
probably not less than 500 feet, and probably with underlying sandstone 100-400 feet 
thick, under which is limestone. Water-bearing strata at sea-level. Dip of strata, 
5° N.-S. 
. The station is at an astronomical observatory. 
ROBERT H, WEST, 
Bidston (Liverpool Observatory), England. 
Lat., 53° 24’ 5” N.; long., 3° 4’ 20’ W.; alt., 202 feet (barometer cistern). 
The foundation of seismometer is at an altitude of 178 feet. 
Foundation is on sandstone. 
Topographical Situation —On the top of a small eminence, from which the ground 
slopes away rapidly in every direction but the south. It is the highest ground in 
the immediate neighbourhood. 
Geological Structwre.—The rocks at Bidston are strongly current bedded, hence 
dips are not very reliable. The general dip is to the east, about 5°. Under the 
Observatory there are 25 feet of Keuper basement beds, then a thin band of marl 
less than a foot in thickness, followed by Upper and Lower Bunter. In a boring near 
Bidston station the Bunter has been proved to be 2,850 feet below surface. This 
may include some Permian. The line of water saturation varies, as it is affected by 
pumping. It is probably at a depth of 200 feet. 
The station is an astronomical observatory. 
WILLIAM E. PLUMMER. 
1 Also see Brit. Assoc. Rep., 1899, p. 178. 
