My teaching was devised to cut up the map of Boston. I pasted the pieces in notebooks and sent out students in pairs, equipped with map books. They were to keep pencils sharp, use a uniform system, and hammer off specimens from ledges. They were to examine the rock under a magnifying glass, then name it; but I cautioned them, “If you don’t know the rock, call it ‘FRDK, funny rock don’t know.’” Students marked the page opposite each map with symbols for the rocks on that map. Then they came together in seminar, and we made a colored map of the geology of Boston. Laurence La Forge, now professor at Tufts College, was my student and later my assistant. He published the results of our work many years after the study was made. When teaching was extended into experimental geology and geology of the United States, laboratories were set up in the basement of Agassiz Museum and I was given carte blanche to furnish them. I equipped them with a water tank, a gas furnace for melting and recrystallizing minerals, pressure machines, an air compressor, and motors. Students were assigned experiments with wax, plaster, cement, sands, coal dust, and marble dust. They imitated strata, rivers, deltas, intrusions, and mountain folds, and familiarized themselves with the way solids break. Each man took a special arbeit for his final thesis, and worked by himself with clock or metronome, thermometer or pressure gauge, spring balance or centimeter scale, and he reviewed the experiments of the past. Prominent among my students were Ralph Stone, afterwards state geologist for Pennsylvania; Vernon Marsters of Indiana; Julius Eggleston of Riverside, California; and Ernest Howe of Yale. In the course on United States geology were such students as Amadeus Grabau who became leading paleontologist of China; Stefansson the arctic explorer; Ellsworth Huntington, afterwards the distinguished Yale author and geographer; and Franklin Delano Roosevelt. With so many Roosevelts at Harvard, I quite forgot my famous student until his first visit to Hawaii, in 1934. Mr. Roosevelt had remembered his geology professor, though, and an aide phoned the Volcano headquarters to request that I be at Hilo when the President’s ship arrived. The United States geology course was the product of my two seasons in the Yellowstone and my interest in the great Hayden, King, and Powell surveys. The youthful geologists needed to know the continent and its details.