the means, by which it may safely be obtained and improved, he will have done all in his power, to answer his customers expectation, and to secure his success. This arrangement, which appears the most simple, is that, which the reader will find observed in the following sections. The proper illustrations of tables and examples have not been omitted, and from the complete plans for brewing, under two forms of the most dissimilar kind, it will be found the rules are adapted to all circumstances, and applicable to every purpose. I must here add somewhat in justification, for publishing what may be said to be the mysteries of an art, often too cautiously precluded from the sight and attention of the public; but every art and science whatever have equally been laid open, and from such communication received greater improvements, and become more useful to mankind in general, and the professors of them in particular. If attention is given to the rules and practice here laid down, it will be found that the brewer, from the large quantities he manufactures, from repeated experience, from the conveniency of his utensils, and more than all, from the interest he has to be well acquainted with his business, is most likely to be successful, in preference to any one else, and therefore can have no reason to be displeased on being presented with a theory and practice, which, far from being the sole right of the brewery, the discovery of the principles were certainly the property of the author and of his friends, whose names would do his work honor if mentioned. From the application of these principles, being convinced of their exactness and facility in practice, he offers his labor to a trade he esteems, with no other view than the hope he entertains of being of some service to it and to the public. If, notwithstanding repeated endeavours, some things, in this treatise, should appear out of their places; others, in more than one; if redundancies, chiefly occasioned by the natural temptation of accounting for particular appearances, have not always been avoided; if inaccuracies should now and then have escaped me, let it be remembered (by the good-natured it certainly will) that, in new and intricate subjects, digressions and repetitions are in some measure allowable, that an over-fulness is preferable to an affected and often obscure brevity, and that the improvement of the art, rather than the talent of writing, must be the brewer’s merit, and was my only aim. SECTION I. _OF THE HEAT OF THE AIR_, AS IT RELATES TO THE PRACTICAL PART OF BREWING.