The story of Sir Humphrey Davy and the invention of the safety-lamp (1878)
London ; New York : T. Nelson · leaf 100
. One thing at a time. Whatever is worth doing at all^ is worth doing wcU. The old adage. Divide et impera—Divide andgovern—-is as true in the region of study as in theworld of politics. Choose your object, and devoteall your powers to attain it. The point once STRONG IN WJLL. 93 determined at… … CHAPTER lY. THE CLOSE OF A USEFUL LIFE.
