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Johnson contrived to amuse his solitary hours. He sometimes employed himself in chymistry, sometimes in watering and pruning a vine , sometimes in small experiments, at which those who may smile, should recollect that there are moments which admit of being soothed only by trifles .
The European chymists have since reasoned upon fermentation; each of them has produced a new system; none have been able to bring it to a regular demonstration; and the learned Gay Lussac has said, that fermentation is one of the most mysterious operations of chymistry.
"Fermentation is a spontaneous and intestine motion, which takes place amongst the principles of organic substance deprived of life, the maximum of which always tends to change the nature of bodies, and gives rise to the formation of new productions." Bouillon la Grange. Manual of a Course of Chymistry. Fermentation has long since been divided into spirituous, acid, and putrid.
'Baxter's Reasons of the Christian Religion, he thought contained the best collection of the evidences of the divinity of the Christian system. 'Chymistry was always an interesting pursuit with Dr. Johnson.
If you were quite mistress of natural philosophy, he would now be hourly acquiring a knowledge of various branches, particularly natural history, botany, and chymistry. Pursue these studies, and also that of language. For fifty dollars you may get, in Philadelphia, a chymical apparatus, put up in a small box, with which more than one hundred experiments may be made.
In that age, more than in our own perhaps, the influence of the individual was widely and intensely felt. Historical chymistry is only rendered possible by a detection of the subtle emanations, which it was supposed would for ever elude analysis, but which survive in those secret, frequently ciphered intercommunications.
After a short holiday, I indulged my curiosity in some studies of a very different nature, a course of anatomy, which was demonstrated by Doctor Hunter; and some lessons of chymistry, which were delivered by Mr. Higgins.
Chymistry invented new methods for refining and drying saltpetre in a few days. As a substitute for mills, pulverized charcoal, sulphur, and saltpetre were mixed, with copper balls, in casks which were turned round by hand.
His insatiable curiosity after knowledge engaged him now in the practice of chymistry, which he prosecuted with all the ardour of a philosopher, whose industry was not to be wearied, and whose love of truth was too strong to suffer him to acquiesce in the reports of others.
He will much inlarge Materia Medica, Chymistry and Pharmacy, and discover the grounds of them, and wherein the efficacy of remedies lyes, and thereby lay open a whole Ocean for new discoveries, and by the by observe many useful products and Phenomena of Nature, to the great improvement of his Art, and sound Natural Philosophy, which are not taken notice of by Apothecaries, and their Servants; for all which they have neither will nor skill.
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