From "History of La Crosse County, Wisconsin", 1881, p. 760. City of La Crosse O. C. HALS, druggist; was born in 1849, in Norway, about twenty miles from Christiania; son of Dr. Frederick E. Hals. He was educated at the University of Christiania, graduating in 1872; came to America in 1873, and has been in La Crosse ever since, except fifteen months in Albert Lea, Minn. He is now located on Pearl street, where he started business for himself, in January, 1881. [I am not related to this family and have no further information. I'm posting this as a service and hope it helps!]