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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
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