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Rh that only a few can possibly be carried to fruition, I am compelled to regret that my attention has been so divided. On the other hand, I do not deplore a certain amount of division. An investigator may advantageously follow more than one line of inquiry, if only to avoid the cramping effect of isolation. The methods of different researches interact with profit to all."

He was married November 10, 1874, to Fannie Loretta Porter, of Cambridge, Massachusetts. They had three children, two of whom are living in 1905. Mrs. Gilbert died March 17, 1899. His address is care of Geological Survey, Washington, District of Columbia.