By mid-century, industry in Mansfield was entering its boom years.   The State Census for 1845 indicates that the number of silk mills had grown to five, employing 17 men and 59 women.   Some 7,900 pounds of sewing silk were manufactured, but the production of raw silk was reduced to 317 pounds. A blight had devastated the mulberry orchards and fewer silkworms were being raised. With little local supply, manufacturers were forced to use imported raw silk.   The 1845 Census also shows that there was one cotton mill that employed 30 people, a knitting mill that employed 14 people and a number of smaller enterprises.