"Perfect in the instant; something went before. There must be remote matter. Nor can this remote matter suddenly Progressso from extreme unto extreme As to grow gold, and leap o'er all the means. Nature doth first beget the imperfect, then Proceeds she to the perfect." I HAVE made an attempt to put forth in some kind of orderly sequence a few of the chief guiding conceptions of chemistry; endeavouring, on the one hand, to avoid technical details, and, on the other hand, to illustrate these conceptions by describing many common facts. I have tried to keep the attention of the reader fixed on the great generalisations of chemistry; and I have done my best to shew that these generalisations find constant application in the occurrences of everyday life. AUTHOR]