ON SEISMOLCGICAL INVESTIGATION, 199 
fathoms on the face of the western bank of the Tuscarora Deep. That 
sea waves were not reported indicates that submarine landslips or sudden 
displacements of materials on the ocean floor were not of marked magni- 
tude. 
Time in Transit Distance Velocity kms. per sec. 
Place | P.T’s | 
P.T’s L.W.'s_|Degrees 3 are |Onchord P.T.’s ea | L.W.’s 
ms. kms. |on are on arc 
chord 
My (Bs M. 
Shide . .| 25 65 58 0 86 9546 8675 (ia | 56 DG 
Ischia . .|—3 0 = 87 9h5T 8756 as = pat 
Catania . .| 15 58 61:0 90 | 9990 8994 10-4 9:3 2-4 
San Fernando| 27 0 60 99 | 10989 9672 67 59 2°8 
Potsdam. a 18. 0 -— 79 8769 8091 81 T5 a 
Nicolaiew a) Hee 51-0 75 8325 1743 99 9:2 227 
Toronto. .| 26 50 62:0 89 9879 8915 61 bays 2°4 
Rocca di Papa} 15 40 500 89 -| 9879 8915 10°5 9-4 32 
No. 195, April 25, 
H OM M. Ss. Hi, (Metis 
Shide A : ; A pom LOR ba iy _ — 
to 12 25 10 
Kew ; : ; ? Pee tt 5 54 — — 
to ll 24 a 
Nicolaiew . ‘ : ; a ITY 30 8 30 ll 44 O 
Catania. : ‘ r 7 Ae 40 10 — a 
Potsdam . s é 7 - Il O- 0 (bout) — 
No. 196, April 29, 
me Tels si Hy age 7S: 
Shite) ietees paiceb harden we (4 — 16 59 0 (about) 
tomy 30 34 / 
San Fernando . a) Saye Ue) oa —_ 
Nicolaiew . ; Se LD, is Ue m8) — = 
Rocca di Paya. . 16) 40°" 0 — 16) 43:50 
Ischia P : . 16 58 O = aoe 
Catania : : . 16 383 40 -- Lee eee sé 
Lidston ; ‘ . 17 O OA(atout) — — 
Toronto ; ; . 16° 28 .20 — irre ait Ys: 
Potsdam 5 ; . 16 30 O (about) — 16 57 = O (about) 
The Shide and Potsdam seismograms, although they have definite 
commencements, are but marked thickenings of the normal trace. The 
times for maxima are therefore uncertain. The tremors reached Shide at 
least eleven minutes after reaching Toronto, whilst the large waves at 
Shide were twenty-four minutes behind those at Toronto. With a 
velocity of 25 kms. per second when the large undulations reached 
Toronto they would be at a distance of 32° from Shide. Considerations 
of this description based upon the above data suggest the idea that this 
earthquake had its origin on the western side of the Atlantic in the 
‘direction of the West Indies. 
