HAVING the honour to perform the Task of this day; I shall endeavour to conform to the Phylosophy, which this Society doth profess; which is, Reasoning grounded upon Experiment, and the Common Notions of Sense. The former being, without the latter, too subtle and intangible; the latter without the former, too gross and unmanageable: but both together, bearing a true analogy to our selves; who are neither Angels, nor meer Animals, but Men.

The Subject I have chosen to speak of, is Mixture. Whereof, that our Discourse may be the more consistent, and the better intelligible; all I have to say, shall be ranged into this Method; viz.

1. First, I shall give a brief account of the received Doctrine of Mixture.

2. Next, lay down some Propositions of the Principles whereof all Mixed Bodies consist.

3. Then, open the true Nature of Mixture; or say, What it is.

4. And then enumerate the Causes of Mixture; or say, How it is made.

5. Lastly, I shall shew the Power of Mixture; or, What it can do.