How can I find Scottish evidence in parliamentary papers on particular subjects?

Look at  J.A. Haythornthwaite N. C. Wilson and V. A. Batho, Scotland in the Nineteenth Century: an analytical bibliography of material relating to Scotland in Parliamentary Papers 1800-1900 (1993). This describes the content of evidence presented to parliamentary committees and commissions and is arranged thematically in broad subject groupings (e.g. ‘agriculture’, ‘crime and punishment’, ‘education’, ‘industry’ etc), and an index. In each case there is a reference to the year, volume, sessional number etc.