Section 37. Members of the staffs of the Bristol county agricultural school, the Essex agricultural and technical institute and the Norfolk county agricultural school shall investigate farm and market conditions for the purpose of advising individuals and organizations as to business methods among farmers, and satisfactory methods of marketing farm products, shall instruct in the formation of co-operative enterprises, and shall perform other work calculated to promote the agricultural or rural development of the respective counties. Members of such staffs shall keep in touch with, and avail themselves of, agencies in the commonwealth or elsewhere that will enable them to utilize the latest and best knowledge and practice in the furtherance of their work.