136 Correi.pondi:nce. 
Mar. 3. A shock during the night swayed the house. 
Mar. 4. Shock last niglit whicli waked me. 
Mar. 13. Several detonations during the last few days. Severe shock 
waked me at midnight. 
Mar. 13 to 25. Scarcely a day or night has passed without severe det- 
onations and shakes. I felt three during one hour of the 19th, about 
midnight, as did several other persons in the village. The effect on the 
house is shown in the blinds, window-catches and door-locks which get 
out of gear. 
Mar. 25 to Apr. 8. Detonations more or less violent almost ever^' Ad\. 
One on the 4th was the severest of the winter. Property holders much 
discouraged. 
Apr. 16. Very violent shock last night. Was awake when it happened, 
and for some time before. Heard the advancing roar as it seemed to ap- 
proach the house. When it arrived the house shook violently and swayed 
to and fro for some time before it settled again. An hour later the house 
rocked back and forth without any shaking or noise. Shock at 11 A. m. 
this morning less severe. Weather for the last few days intensely hot. 
Heavy thunder and lightning and change to cold weather by the morn- 
ing of the 17th. 
Apr. 19. Detonation anil slight shock at jo i'. m., which set all the 
dogs barking with fright. 
May 2. Many detonations during yesterday evening and a very long 
shake in the night. 
The sounds are described by the friend fioni \yhose record the above 
extracts are made as resembling those which would be produced by firing 
cannon in the cellar and the jars indicate that the waves emerge in a 
nearly vertical direction at Summerville. The swaying of the houses 
without accompanying noise or jar may be caused by the propagation of 
another wave from a center at a greater distance or by the reflection of 
a wave from below emerging else^yhere. 
E. W. Cl-AYPOLE. 
Akron, Ohio, ^unc 10, jSSS. 
Sii'cr >iiv /as/ nolr to yon on the formation of the southsitle of Long Is- 
land, there have come into my hands specimens of sand and clay from a 
well boring at Woodhaven, about one mile from Jamaica bay and about 
the same distance from the front of the terminal moraine. The tube-well 
has been sunk to the depth of 500 feet without finding shells or any other 
marine matter, going to prove, we think, that the southside of the island 
is entirely of glacial origin, including the so-called sea-beaches. 
The result of the boring so far is as follows: 
1 to 113 feet— Fine saml and gravel. 
IIH " 14-4 ■' — San<) aii<l coarse gravel. 
144 " 315 " — Ueddisli sand to 218; from 230 to 275 a tough, whitish clay; from 
24(3 to 315 the flay is mixed with pebbles of considerable size. 
315 " 385 " —The clay is mixed with vegetable matter to 358; then beach sand 
containing pieces of wood or lignite. 
