84 REPORT—1905. 
zu Strassburg, i/E.’ These latter records only indicate whether the 
instrument had responded to certain disturbances, and do not furnish 
information as to times and amplitudes. 
It is anticipated that continuations of registers from Mauritius, 
Tokyo, and Wellington will shortly be received. 
From the United States Coast and Geodetic Survey your Secretary 
learns that copies of registers are to be forwarded from Honolulu, while 
Professor H. F. Reid writes to the effect that Professor S. J. 
Cunningham will recommence observations at Strathmore College, 
Philadelphia. 
Four other observatories, the records from which would be of great 
value, particularly as an assistance in localising seismic foci, are Mexico, 
Arequipa, Melbourne, and Sydney. The registers from the latter two, 
taken in conjunction with those from New Zealand and those obtained 
by the ‘ Discovery,’ the examination of which has been entrusted to your 
Secretary, will undoubtedly throw light upon suboceanic changes now in 
progress in the Antarctic regions. 
Il. The Sitwation of Stations. 
As it is recognised that the character of a seismogram is to a greater 
or less extent dependent upon the topographical and geological situation 
of the observatory at which it was obtained, a letter was sent to each of 
the stations at which horizontal Milne pendulums have been established, 
asking for information relating to their installations. The replies which 
have been received run as follows :— 
Abbasia. Cairo, Egypt. (See also Helwan.) 
Lat., 30° 04' 36’ N.; long., 81° 17’ 13:5’ H.; alt., 33 metres. 
Foundation is on sandy loam. 
Topographical Sitwation—On the border between desert and cultivated delta ; 
5 kilometres from the Nile. 
Geological Structwre.—The neighbouring desert to the east is mainly horizontally 
bedded limestone. The actual surroundings are Nile valley deposits. 
The station is at an astronomical observatory. 
B. H. WADE, Superintendent. 
Azores. Ponta Delgada, S. Miguel, Azores (Meteorological Observatory). 
Lat., 37° 44’ 18:3’; long., W.G. 25° 41' 15’’ (1h. 42m. 45s.) ; alt., 16 metres. 
Foundation is on a layer of basaltic rock. 
Topographical Situation.—On low ground with an extent of nearly 2 kilo- 
metres. To the south (nearly 120 metres) is the sea. The hills (small or great 
craters) near the town have a niean altitude of 180 metres. The nearest is situated 
at a distance of 2 kilometres. The great mountains lie to the N.E. and HK, Their 
height is 900 metres, and they are 9 and 12 kilometres from the town. 
Geological Structwre.—A very thin soil of volcanic cinders, covering a layer, very 
thick (unknown thickness), of basaltic rock. The layer was produced by the 
descent to the sea of a lava stream poured from a crater situated at the north of the 
town of Ponta Delgada. 
Time-keeping.—The hour of the watch is every day compared with the regulator 
established in the Observatory. 
Franciso A. CHAVES, 
Director of the Meteorological Service of the Azores, 
