(11 April 1839-23 Feb. 1895), lumberman. Born at Williamstown, GC. Parents: John McArthur, the lumber merchant, and his wife Margaret McMartin. Alexander McArthur settled in Toronto around 1863. By 1872, he had joined his brothers John and Peter McArthur in John’s Toronto lumber firm. Over the next few decades this firm, McArthur Brothers, carried out extensive lumbering operations in Canada and the United States in areas including Lake Huron and Georgian Bay, the Ottawa Valley and Michigan. Alexander McArthur was president of McArthur Brothers at the time of his death. He is said to have had interests also in mining in Canada. He died in Asheville, North Carolina, where he had gone for reasons of health. Married (five children). His wife’s Christian name was Mary Jane but her surname has not been discovered. He was the brother of Archibald McArthur, of GC, and R. D. MacArthur.

His life by Gwenda Hallsworth, Dictionary of Canadian Biography, XII, 577-578 * history of the company in obituary of his brother Peter, Cornwall Standard 13 Jan. 1911 (repr. from Toronto Mail & Empire) * Olga B. Bishop, Publications of the Government of Ontario 1867-1900 (1976) 194 * mentioned DCB, XIII, 929 (association with timber merchants Scarth Bros.)