OSCAR F. KNAPP.--Capt. Knapp has been conspicuous as a steamboat maker, owner and captain for the last thirty years. He was born in Clinton county, New York, in 1831. At the age of fifteen years he came West and located in Delavan, Wisconsin. In 1852 he removed to Osceola, Wisconsin, where he engaged in lumbering for about four years. In 1856 he was married to Miss Angeline Hayes, of Osceola. In the same year he engaged in the business of steamboating, with which he has been since identified more or less. His first steamboat was the H. S. Allen, which, in company with E. B. Strong, he bought of H. S. Allen, of Chippewa Falls, in 1856, for $5,000. In 1862 he built the Enterprise, a small but serviceable boat of light draft and fair speed. In 1864 Capt. Knapp built the Viola, owned by a stock company. In 1866 he built the G. B. Knapp, in 1879 the Jennie Hayes, and ran these two boats fourteen years. In 1877 he entered the employment of the United States government, improving the navigation of the St. Croix river, in which work he is still engaged. His two sons, Ben and George, succeeded him in the steamboat business. Ben, the oldest son, was born in Osceola in 1857; George, the second son, in 1859. These two boys spent their childhood and youth on the river, and have grown up to be expert pilots and captains, and inherit their father's popularity as river men. Ben was married to Addie Talboys, June, 1880; George to Claribel Wilson, in 1883. Capt. Knapp has two other children, Viola, now Mrs. Arthur Johnson, and Guy, still a minor. Mrs. Angeline Knapp died at her home in Osceola, March 6, 1883, respected and lamented by all who knew her. Capt. Ben Knapp died Oct. 5, 1887, leaving a wife and two children. MRS. ELISABETH B. HAYES.--Mrs. Hayes was born in 1811, in Dundee, Yates county, New York. In 1854 she removed with her husband to Missouri. After his death, in the fall of the same year, she came with her children to Osceola, where she built the Osceola House, which she kept a number of years. The daughters were Angeline B. (Mrs. O. F. Knapp), Mrs. Hubbell and Mrs. Milroy, of New York, and Mrs. Truman Foster, widow, since the wife of Capt. C. G. Bradley. Her sons were George, Frank and David. Capt. George Hayes followed piloting and steamboating, excepting during the Rebellion, when he served as a soldier in the Fourth Wisconsin Volunteers. In the latter part of the war he served as a scout for Gen. Canby. At the present time he has the appointment of steamboat inspector, with office in St. Paul. David has been prominent as a steamboat captain. He now resides in Iowa.