Rules and MeMORIAL CANONS for finding the

Dominical Letter, Leap-Year, Epact, Easter,.&c. ac-
cording to the Gregorian Account or New Style ; with
an Explication of the Reason of each Rule.

Adapted to
The INSTRUCTION and ENTERTAINMENT of

such Persons as are not previously versed in Mathe-
matic Science.

W IT HAN

Α Ρ Ρ Ε Ν DI X,
Attempting to explain the Account of the First and Fourth
Days Work of Creation in the First Chapter of Genesis.

By DAVID JENNINGS, D. D.

Hest, a Sul

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Τ Η Ε

P R E F A C E.

HE Persons for whose Sake and

Use the following Treatise was at first drawn up, (or rather I should say, as to the greater Part

of it, this Collection made out of many other and larger Books) are chiefly such, who, though they have not the Opportunity of attending to the more abstruse Parts of Mathematic Science, are desirous at least, of some general Knowledge in these Matters ; such who, though Providence has marked out their Tract of Life amidst Scenes of worldly Business, yet have Souls large enough to extend themselves, now and then, beyond this little Planet, and take a distant View of more remote Worlds ; in the Contemplation of which, both the philosophic and pious Mind may find Entertainment and Profit. The Works of the Lord are great, A 2

fought