Marsden Hartley (1877-1943) was proud to call himself an American artist, but he dreamed of travel to Europe, believing instinctively that he would learn more there than would be possible in his home state of Maine or even in New York. In 1909 Alfred Stieglitz gave Hartley his first solo exhibition in New York, and a second successful show three years later enabled him to head to Europe, where he spent time in Paris, Berlin and Munich. His rise...