T ADVERTISEMENT. HIS Small Tract was intended to make a part of the Treatife of Algebra; but other matters had fwelled the book to too large a fize, to admit of this; which therefore was postponed to a further opportunity. The Subject of it, which is the Doctrine of Combinations and Alternations, is a very entertaining and curious fpeculation; by which, a great many very delightful problems may be refolved: which will appear strange and surprizing to them that are not verfed with thefe forts of calculations. The Dottrine thereof is here compleatly delivered, and in a little compafs; and the rules demonftrated in the plainest and eafießt manner, and therefore I hope it will prove beneficial and acceptable to the reader. |