English chemist who discovered oxygen. ALS signed 'J. Priestley,' one page, 8 x 4, no date. Concluding nine lines of a letter to physicist John Canton. In part, 'As you like your pennyworth, I send you another, rather more money. A third will follow, when I have time to write, and then this little scheme will be completed. I have many more theological affairs on my anvil. These are my favorite studies; but I cannot live by them.' In very good condition, with triangular cut from bottom edge, affecting a word in closing, some light toning and soiling and expected folds. RRAuction COA.