II.

At Bridgetown, on the 1st November, 1755, Dr Hillary saw the peculiar flux and reflux of the water in the harbour from 2.20 p.m. to 9 p.m. and pronounced that there must have been an earthquake somewhere. The waves came at first at intervals of five minutes, and at last at intervals of twenty minutes. The day was calm, and the ships in the bay were not touched; but small craft lying in the channel over the bar were driven to and fro with great violence. There was no motion of the earth, and no noise. The distance from Lisbon was 3400 miles, the vibrations having taken seven and a half hours to reach Barbados. The one notable effect in the harbour of Bridgetown was that the water flowed in and out with such a force that it tore up the black mud in the bottom of the channel, so that a great stench was sent forth and the fishes caused to float on the surface, many of them being driven a considerable distance on to the dry land where they were taken up by the negroes[763].

It so happened that there was an epidemic catarrh prevalent at that very time all over the island of Barbados, chiefly among children, few or none of whom, white or black, escaped it. It had begun in October, says Hillary[764] (who chronicled the epidemiology very exactly), and continued into November, so that it both preceded and followed the great convulsion in the bed of the Atlantic, which destroyed Lisbon and tore up the mud in the harbour of Bridgetown, disengaging a great stench therefrom and poisoning the fish. Webster’s theory of a relation between earthquakes and influenzas provides for such discrepancies in the dates of each: it is probable, he says, that seasons, earthquakes and volcanic eruptions are themselves the effects of those motions and invisible operations which affect mankind, so that catarrh and other epidemics often appear _before_ the visible phenomena of eruptions and earthquakes. In like manner, the chronicler of the earthquake of Lisbon in the _Philosophical Transactions_ drew attention to the fact that there had been a remarkable drought for several years before, and that some of the springs near Lisbon were actually dried up at the time. That droughts precede earthquakes is perhaps the most instructive generality that has yet been reached as to the cause of the latter.

Let us see, then, whether any such remote antecedents, in a possible relation to the influenza epidemics, hold good for the island of Barbados. Hillary’s chronicle is sufficiently full to let us answer the question.

Following the seasons and prevalent maladies backwards from the influenza of children in October-November, 1755, we find a catarrhal fever all over Barbados in February of the same year, which “few escaped having more or less of.” The immediate precursor of that influenza had been a very definite constitution, eighteen months long, of a “slow nervous fever,” from February, 1753 to September, 1754, which corresponds in every respect to the “remittent” fever of nearly the same period in England and Ireland, described by Fothergill, Rutty, Huxham and Johnstone, and to the famous Rouen fever described by Le Cat. Hillary is clear that the “slow nervous fever” was not seen again so long as he remained in the colony (1758). Just before it began, there had been an influenza so general in December, 1752, and January, 1753, “that few people, either white or black, escaped having it,” and that, in turn, was preceded by a season of agues, which, says Hillary, “are never seen in Barbados now [1758], unless brought hither from some place of the Leeward Islands.”

So many influenzas in Barbados, and so many things possibly relevant to them among their antecedents. So also in New England, the influenza which seemed to follow the earthquake along the coast of Portugal on the 31st of March, 1761, had the same remittent and intermittent fevers among its antecedents.

In the winter and spring of 1760-61 there had been much fever in New England, which was believed to be malarious. Webster, however, says: “There is no necessity of resorting to marsh exhalations for the source of this malady. The same species of fever [as at Bethlem] prevailed in that winter and the spring following in many other parts of Connecticut where no marsh existed. In Hartford it carried off a number of robust men, in two or three days from the attack.... In North Haven it attacked few persons, but everyone of them died. In East Haven died about forty-five men in the prime of life, mostly heads of families. The same disease prevailed in New Haven among the inhabitants and students in college.” In Bethlem the sickness began in November, 1760, and carried off about forty of the inhabitants in the winter following. This was the fever, generally reckoned malarious, which preceded the influenza of April and May, 1761[765].