of the family with whom I was boarding that if he would give me a candle I would go back to the schoolhouse and make arrangements for lighting the fire at eight o’clock, without my having to be present until time to open the school at nine.  He said, “Oh! young man, you have some curious things in the school-room, but I don’t think you can do that.”  I said, “Oh, yes!  It’s easy,” and in hardly more than an hour the simple job was completed.  I had only to place a teaspoonful of powdered chlorate of potash and sugar on the stove-hearth near a few shavings and kindling, and at the required time make the clock, through a simple arrangement, touch the inflammable mixture with a drop of sulphuric acid.  Every evening after school was dismissed, I shoveled out what was left of the fire into the snow, put in a little kindling, filled up the big box stove with heavy oak wood, placed the lighting arrangement on the hearth, and set the clock to drop the acid at the hour of eight; all this requiring only a few minutes.

The first morning after I had made this simple arrangement I invited the doubting farmer to watch the old squat schoolhouse from a window that overlooked it, to see if a good smoke did not rise from the stovepipe.  Sure enough, on the minute, he saw a tall column curling gracefully up through the frosty air, but instead of congratulating me on my success he solemnly shook his head and said in a hollow, lugubrious voice, “Young man, you will be setting fire to the schoolhouse.”  All winter long that faithful clock fire never failed, and by the time I got to the schoolhouse the stove was usually red-hot.

At the beginning of the long summer vacations I returned to the Hickory Hill farm to earn the means in the harvest-fields to continue my University course, walking all the way to save railroad fares.  And although I cradled four acres of wheat a day, I made the long, hard, sweaty day’s work still longer and harder by keeping up my study of plants.  At the noon hour I collected a large handful, put them in water to keep them fresh, and after supper got to work on them and sat up till after midnight, analyzing and classifying, thus leaving only four hours for sleep; and by the end of the first year, after taking up botany, I knew the principal flowering plants of the region.

I received my first lesson in botany from a student by the name of Griswold, who is now County Judge of the County of Waukesha, Wisconsin.  In the University he was often laughed at on account of his anxiety to instruct others, and his frequently saying with fine emphasis, “Imparting instruction is my greatest enjoyment.”  One memorable day in June, when I was standing on the stone steps of the north dormitory, Mr. Griswold joined me and at once began to teach.  He reached up, plucked a flower from an overspreading branch of a locust tree, and, handing it to me, said, “Muir, do you know what family this tree belongs to?”

“No,” I said, “I don’t know anything about botany.”