B. Crosby engaged in the banking business with the organization of the Rock County Bank.

The evidence

• “B. CROSBY, General Manager of the Harris Manufacturing Co. ; came to Janesville in 1852 ; engaged in dry-goods business until the organization of the Rock County Bank in October, 1855, when he engaged in the banking business ; was the first Cashier of that institution until 1870, except during the year of 1857 ; from 1870 to 1877, Mr. Crosby was a resident of Brooklyn, N: Y. ; in 1877, he returned to Janesville and has given his attention to the manufacturing business since that time ; his father, Nathaniel Crosby, came to Janesville in 1 850, built a large flouring-mill here and carried it on until his-death in 1857.”

  1879-history-of-rock-county/17-bios-janesville.md, PDF p. 699

  Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.

  Grade A: Found on a page of one of our sources