Ee — 
ON SEISMOLOGICAL INVESTIGATION. 179 
THE BATAVIA REGISTER—continued. 
Commencement 
No. Shide No. Date Garman. | / Duration 
: Maximum / 
sations 
/ H. M. He, He, Me: | 
a1 — | Oct. 22 0 93 0 19°6 0 26:6 
22 = Nov. 2 11 28:8 | Jl 29:3 i 0 
23 = Aro Rae 11 59°5 — oe.” 
24 ia eS 15 33:4 15°33°6 o102 | 
25 239 7 13 12°6 13 13:0 0376 | 
26 - Fgh Oke 7 45-2 7 46:8 0 93 | 
7k" = a 29) 22 34-0 22 36-4 0 94 | 
28 | = in Dees 02 12 216 12 27-2 O14 | 
29 243 eat S 16 59-9 17 06 0.20 | 
30 — 5 4 7 18-0 T 25-4 Or5:05 | 
3 = | =k 7 43:8 7 44-2 0289 |} 
32 ze 6 10 28:6 10 28°8 0 21 
33 ot tae BGS 13 31°5 13 34:8 F222"! 
34 = So eyo 3 07 3°17 0 6-0 
35 = ie dul 2 11:1 2 135 0 76 
| 36 sie, Heel lYy 51:1 1 51:2 0 06 
37 = DI 3 52:3 3 53:5 0 2-4 
38 =e + ay 9 29 9 49 0 29:8 
39 = 3 OB 21 56:0 21 56:2 0 O07 
' 40 = » 29 2 446 2 44-9 i oes) | 
j; 41 — | Pa aT 9 16-0 9 22:5 Ort 
1899. 
1 42 | 247 Janelle >| 8 43 l 8 88 0 15-0 
; 43 | 264 [Mar 12s | — 10 $2 0 25-0 
Nos. 15 and 19 were also recorded by Ewing’s Bracket Seismograpi). 
Nos. 1, 4, 5, 6, 12, 15 and 19 were also felt at different places in West 
Java and Sumatra. Earthquakes felt on the Eastern part of the Archi- 
pelago (Moluccas) are not yet regularly recorded. 
10. Mauritius: Royal Alfred Observatory. Director, T, ¥. Craxtoy, RAS. 
The Observatory, in lat. 20° 5’ 39’S., and long. 3h. 50m. 12°6s. E., is 
situated on a plateau about four miles from the north-west coas*, and 
180 feet above mean sea level. The soil around the Observatory varies 
from 3 to 14 feet in depth, below which is solid basalt. Extending for 
about half a mile to the west is a forest, thickly wooded with thin acacia 
trees, and to the east are principally fields of sugar cane. 
The instrument is mounted with its boom pointing north, in a small 
hut containing two brick pillars, formerly used for the electrometer. The 
building is 8 feet long by 5 feet wide, and 9 feet high. The roof and 
walls are of wood, covered on the outside with painted canvas, while the 
floor is of concrete, I am not at present in a position to state whether 
the foundation of the piers is on the solid rock, though it certainly is not 
more than a few fect above. 
Observations were commenced in the middle of September, 1898. All 
the seismograms have been tabulated and subjected to analysis, and the 
results will be published in due time; they show principally five 
things :— 
(a) That there is a large diurnal variation in level (probably larger 
N2 
