ON SEISMOLOGICAL INVESTIGATION, 201 
No. 214, June 22. 
Te. tS H. M.) ae Wee it ps 
Shide ; Wb) 62) 42 .— 7 14 42 °& 9% Wa 42 Nine maxina, 
tO 49 7 42 
Nicolaiew palo) O40) | WO ote LS 0 
Rocca di Papa. 6 45 2 — 6 45 18 
Ischia ‘ ;. 6 BL 48 — — 
Catania . = G6 Si) 48) —  *6" 62)" 56 
Batavia . P66. 42) 018 — te 
Kew é . © 5¢ 24, 6h. 56m., 6b. 57m., upto Th.5m. At least 12 
maxima, 
Origin, Greece ? 
No, 215, June 29. 
H. M. s. M. Ani M. s. H. M. s. 
Shide 7 Vom etS aaa? oy VON ie aie 
Kew A = 18% aie 13 9 OP Sabueor | ee ieO, 
Nicolaiew lo. 42, 0 12 18 59 0 
Rocca di Papa 18 48 42 a 18 59 OO (about) 
Ischia > su ISH5ON SO — —_ 
or 18 47 47 
Catania . a SS == 1A Me RT Ns) 
Toronto . Be kre | — 18) 55518 
Potsdam - polite SU! 0) — 19 8 O 
At Shide the duration exceeded three hours, the amplitude was 8 mm., 
indicating a tilting of 4’"8. The period of the large waves was 13’7s., 
which, with a velocity of 3 kms. per second, indicates a wave-length of 
39 kms. The height of these waves may have been 30°2 cm. 
The records for the preliminary tremors indicate that the movements 
commenced at Shide, Kew, Rocca di Papa, Ischia, and Catania about five 
minutes later than at Toronto. The largest group of waves were re- 
corded at Shide and Kew 26m. or 32m. after they reached Toronto. 
The corresponding intervals for the remaining stations cannot be inferred 
with certainty from the above data, as the last column of this for 
Nicolaiew, Rocca di Papa and Catania apparently refers to the commence- 
ment of the large motion. 
Although the data taken as a whole point to an origin much nearer 
Toronto than Europe, and the time intervals for large waves noted in 
Toronto, Kew and Shide suggest an origin on the western side of the 
Atlantic in the direction of the West Indies, the marked difference in 
the time at which the first heavy movements were recorded at Shide and 
Kew throw great uncertainty upon the localising of the originating centre 
No. 216, July 2. 
TN wis M. OS Hetattie., S 
Shide 4°97 94 — —_— 
Kew 4 25 24 -- Aer to 
Nicolaiew 1 22)" .0 1 730 Ase 25 (0 
Rocca di Papa MTT O —- 4 21 0 
Ischia aa US a [Pe — — 
Catania 4 19 52 — ARDS 43ST 
Potsdam 4 Dod — _— 
Origin, Dalmatia. Both the preliminary tremors and large waves 
have been recorded at distant stations in an expected order. 
