One writer has well said of Audubon: "For sixty years or more he followed, with more than religious devotion, a beautiful and devoted pursuit, enlarging its boundaries by his discoveries, and illustrating its objects by his art. In all climates and in all weathers; scorched by burning suns, drenched by piercing rains, frozen by the fiercest colds: now diving fearlessly into the densest forest, now wandering alone over the most savage regions; in perils, in difficulties, and in doubts; with no companion to cheer his way, far from the smiles and applause of society; listening only to the sweet music of birds, or to the sweeter music of his own thoughts, he faithfully kept his path. "The records of man's life contain few nobler examples of strength of purpose and indefatigable energy. Led on solely by his pure, lofty, kindling enthusiasm, no thirst for wealth, no desire of distinction, no restless ambition of eccentric character, could have induced him to undergo as many sacrifices, or sustained him under so many trials. Higher principles and worthier motives alone enabled him to meet such discouragements and accomplish such miracles of achievement. He has enlarged and enriched the domains of a pleasing and useful science; he has revealed to us the existence of many species of birds before unknown; he has given us more accurate information of the forms and habits of those that were known; he has corrected the blunders of his predecessors; and he has imparted to the study of natural history the grace and fascination of romance." At Mill Grove he came near losing his life, on a duck-shooting expedition, by falling through an air hole in the ice. It was three months before he recovered. At this time "a partner, tutor, and monitor," Da Costa, whom Audubon's father had sent over to superintend a lead-mine enterprise at Mill Grove, refused to give money to the son and objected to his marrying Lucy Bakewell. Resenting the dictation of Da Costa, young Audubon determined to go to France and lay the matter before his father. Da Costa would give him no money, but a letter of credit upon an agent in New York. The youth, nothing daunted, walked all the way to New York, was refused the money by the agent, who hinted that the lad should be seized and shipped to China, borrowed his passage money, went to France, caused the removal of Da Costa, and obtained his father's consent to his marriage. For a year he resided at Nantes, shooting, stuffing birds, and drawing for his beloved book. Then all Frenchmen being liable to conscription under Napoleon, the Commodore obtained leave for his son to return to America.