E BILLY_. viz.

Multiply the _Solar_ Cycle by 4845. and the _Lunar_, by 4200. and that of
the _Indiction_, by 6916. Then divide the Sum of the Products by 7980.
which is the _Julian Period_: The _Remainder_ of the Division, without
having regard to the _Quotient_, shall be the year required after.

E. g. Let the Cycle of the _Sun_ be 3; of the _Moon_ 4; and of the
_Indiction_, 5. Multiply 3. by 4845, and you have 14535; and 4. by 4200.
comes 16800; and 5. by 6916. comes 34580. The Sum of the products is 65915,
which being divided by 7980. gives 8. for the _Quotient_, and the number
2075. which remains, is the Year of the _Julian Period_.

Some learned Mathematicians of _Paris_, to whom the said _P. de Billy_, did
propose this _Problem_, have found the Demonstration thereof; as the same
_Journal_ intimates.

* * * * *

_An Account of some Books, not long since published._

I. TENTAMINA PHYSICO-THEOLOGICA DE DEO, _Sive_ THEOLOGIA SCHOLASTICA, _ad
Normam Novae & Reformatae Philosophiae concinnata, & duobus libris
comprehensa. Quorum altero, de Dei existentia adversus Atheos & Epicureos
ex ipsorummet Principiis disputatur; altero, de ejusdem Essentia &
Attributis; primo secundum Theologiam Ethnicam, ubi explicatur, Quantum
hactenus Alii in Gentilium sententiis, de summi Numinis Natura eruendis,
hallucinati fuerint; deinde secundum Theologiam Christianam: Et quid de
Divina Essentia ac Attributis statuendum sit, diceretur. Quibus postremo
accedit specialis Dissertatio de Primo Numinis Attributo, AETERNITATE_.
Authore _Samule Parkero_, A. M.

This Treatise, published the last year, would sooner have been taken notice
of in these _Tracts_, had it not escaped the _Publishers_ view till of
late, when he, upon serious perusal, found it very worthy the recommending
it to all sorts of persons; and particularly to those who either please
themselves with that fond opinion, _That Philosophy is the Apprentiship of
Atheisme_; or hearken to the aspersions, that are generally laid upon the
_Reformation_ of _Philosophy_.

This excellent piece removes both these; and being joyned and compared with
the truly Noble Mr. _Boyle_'s Considerations in his _First part_ of the
{325} _Usefulness of Experimental-Natural Philosophy_, will strongly
evince, How Much that Philosophy, which searches out the real Productions
of Nature (the true Works of God) does manifest the Divine Glory more, than
the Notionals of the