direction, duration, and number of shocks so far
recorded.

4. Phenomena connected with the sea--great sea-waves, tides,
etc.

5. Phenomena connected with the land--meteorological phenomena
preceding and succeeding. Secondary phenomena--all minor or
remarkable phenomena recorded.

6. The authority for the record.

Though most materially assisted by the previous labours and partial
catalogues of Von Hoff, Cotte, Hoffman, Merrian, and, above all, of
Perrey, the preparation of this catalogue--which demanded visits to the
chief libraries of Europe, and the collating of some thousands of
authors in various languages and of all time--was a work of great and
sustained labour, which, except for my dear son's help, I should never
have found time and power to complete. Professor Perrey, formerly of the
Faculte des Sciences of Dijon, now _en retrait_, who has devoted a long
and useful life to assiduous labours in connection with Seismology, was
our great ally; and his catalogues are so large and complete for most
known parts of the world after 1842, that we were able to arrest our own
catalogue at that date, and take M. Perrey's as their continuation up to
1850.

The whole British Association Catalogue thus embraces the long historic
period of from 1606 B.C. of vulgar chronology, when the first known
Earthquake is recorded, to A.D. 1850; and the base of induction which it
presents as to the facts recorded extends to between 6,000 and 7,000
separate Earthquakes. My Fourth Report ("Reports, British Association,
1858,") is occupied principally with the discussion of this great
catalogue, and with that of several special catalogues produced by other
authors with limited areas or objects.

The discussion of M. Perrey's local catalogues with those of others, in
reference to a supposed prevalent apparent horizontal direction of shock
in certain regions--as to distribution, as to season, months, time of
day or night, relation to state of tide--the bearings of the views of
Zantedeschi and others as to the probable existence of a terrane
tide--the supposed relations of the occurrence of Earthquakes upon the
age of the moon, as deduced by Perrey, viz.: that 1st, Earthquakes occur
most frequently at the syzygies; 2nd, that their frequency increases at
the perigee and diminishes at the apogee; 3rd, that they are more
frequent when the moon is on the meridian than when she is 90 deg. away
from it--and