TO THE

READER.

HE following Treatise having been

I translated some time since, forthe Information of a sew Friends, wasnot intended to be made Public, but

many superficial pamphlets on the fameSubject having lately made their appear-

ance, which can give very little Informa-tion to their readers, and as many would beglad to know what Dr. Halley has reallysaid himself on the Subject, were not thebook in which it is contained of a largeprice, and the Language in which it iswrote, not generally understood. Theseconsiderations induced the Translator tothis publication, that every one might, ata small price, and with little trouble inreading, have an insight into a Subject,in itself extreamly curious, abstracted from

A 2

any