46 C.F. Winslow on Tides and Earthquake phenomena. 
highest tides occur in December and January, and the lowest in 
June and July ; and the general observation relative to diurnal tudes 
at Tahiti was, that the moon exerted less control over tidal movements 
than in other latitudes or places in the Pacific Ocean, although simi- 
lar, but less mar is. anomalies existed to a noticeable extent in other 
more western gro 
I was at the ca of Toubooai six days early in May of the 
same year, during which J was making more or less observations 
upon the reefs and shores, both on the northern and southern 
sides of the island. The tides appeared to flow there with their 
usual regularity, and rose to a greater height than at Tahiti. 
I have been prompted to communicate these facts because I 
have long considered oe tidal phenomena at Tahiti as important 
to physical science as they are curious and anomalous; and 
week carefully obse ek and studied, I have no doubt they will 
greatly enlarge our general cosmical knowledge, and establish a 
more correct tidal theory than exists at ay oe notwithstanding 
the high utility and value of that we now hav 
ile upon this subject of tidal coments in the Pacific 
Ocean, I will take occasion to mention that during a long period 
of observation upon the coast of Peru with reference to earth- 
uake phenomena, I found, not only the highest tides to prevail 
at Callao and Paita in December and January, but also a series 
of enormous waves or sea-swells to be thrown from time to time 
upon the coast, varying from twenty-four to seventy hours in 
continuance, accompanied by unusual heights of the tide during 
the same period, and, on the contrary also, I remarked that the 
-. 
so far as I have been able to ascertain; but they increase with, 
and accompany, ie swelling of the tides, and occur generally, 
not always, about the full of the moon. They so metimes break 
suddenly upon the coast. They are annual and constant in their 
vcity. During my researches in the old Spanish records for 
earthquake phenomena, I have found them spoken of in the 
past century, and that they lave often made ravages upon the 
coast to a smaller or greater degree. That which overwhelmed 
Callao in 1746 invaded the coast with a front swell of 40 feet, 
a i and a half hours after the first earthquake had suddenly 
astated Lima and Callao, and seventeen and a half — after” 
peak 2 tranquillity of the earth had prevailed. This terrible 
wave extended for hundreds of miles both north and owe 
along the coast, and seemed Ag be an exceptional event in ee 
sity although not wholly so in periodicity, it having oce 
4P.M., Oct. 80th. It was without doubt ciel: dyn ae 
