He... discovered the dependence of the of a liquid upon , explained the action of the , the effect of the air on the vibration of a pendulum and on the propagation of sound, and made experiments on the nature of , and on the relation of air to and .

He introduced the air-pump into England, and his "pneumatical engine" enabled him to discover many of the fundamental properties of a gas, notably the relation of its volume to pressure.

He concludes... that the Paracelsian elements—their "salt," "sulphur," and "mercury"—are not the first and most simple principles of bodies; but that these consist, at most, of concretions of corpuscles or particles more simple than they, and possessing the radical and universal properties of volume, shape, and motion.

The words "element" and "principle" are used by him as equivalent terms, and signify those primitive and simple bodies of which compounds may be said to be composed, and into which these compounds are ultimately resolvable.

He pleads further for the attention of the philosophers to the productions of their humbler countrymen, by reminding them that many of the phenomena of trades are not only parts of the history of Nature, but some of them may be reckoned among its more noble and useful parts, for they show us Nature in motion,—the most instructive condition in which we can behold her."

He illustrates this position by stating the following general principles. The phenomena afforded by trade, are (most of them) a part of the history of Nature, and therefore may both challenge the naturalist's curiosity and add to his knowledge. Nor will it, he adds, justify learned men in the neglect and contempt of this part of natural history, that the men from whom it must be learned are illiterate mechanics, and the things which are exhibited are works of Art and not of Nature.

It appeared to him that to prepare a "History of Trades" in which the observations and practices of different trades might be united... would draw the attention of philosophers to the interests of industry, and of artizans to the benefits promised by philosophy. ...Such a work was not written; and until a more recent period the store of facts gained in the pursuit of industrial occupations was confined to the acquaintance of those who were occupied therein

He states... that he learned more about the structure and peculiarities of stones... by conversing with a few masons... than he could ever gather from the works of Aristotle and Pliny.

Who has won more fame in the field of chemistry than this author? Who can boast of more happy successes or more excellent results? He worked night and day, never letting go of his object, nature; through this science he improved our life and put others share in what he had discovered with superhuman assiduity, at his own peril, at his own expense -- the first, the only one to achieve such happy results. But how devout was this guileless soul at all times! How pure his heart in serving God! He gave us generous love to one and all, and pious veneration to the Divine tterances, distinguishing in the most prudent manner between the principles of religion and the whole field of natural and chemical science. I refer to the writings of this man, which he published for the great good of human race; treatises on the style that prevails in the Holy Scriptures, on the love of God, on the design of God, the Creator, on the duty of gratitude and reverence, to be rendered by man to the Almighty God, his Redeemer.

In the opinion of one of the most eminent modem naturalists, it was Boyle who opened up those chemical inquiries, which went on accumulating until, a century later, they supplied the means by which Lavoisier and his contemporaries fixed the real basis of chemistry, and enabled it for the first time to take its proper stand among those sciences that deal with the external world.