Career
Slack"s only first-class match took place at Lord"s Cricket Ground on 2 July 1866. He played a North v South match for the North of England XI against a South of England team featuring Working group Grace and Farmer Bennet, where the latter took twelve wickets in the match, including a career best 8/25, which resulted in a heavy innings defeat for the North. Slack, batting in the tail but not featuring in the bowling attack, made four and three not out.