Text book, involve either some original matter contributed and published by the author, or it may even include an intelligent selection of the work of another author or authors for use in schools. It may also include some books which have been copyrighted, if the scheme of the book or books involves a graduated or considered study or training in the particular subject like say, books of drawing, it might be said to be a textbook, Gopala Chetty v. Director of Public Instruction, Mysore, AIR 1955 Mys 81: 1955 ILR Mys 203.
A legal treatise which lays down principles or collects decisions on any branch of the law--e.g., Mayne on Damages; Chitty on Contracts, etc.; Darton Vendors and Purchasers. They are, of course, not binding on the Court, but some of them are by general consent treated as guiding authorities: see Ecclesiastical Commissioners v. Parr, (1894) 2 QB 428, per Lord Esher, M.R. Text-books written by living authors who are practising barristers are not cited in the courts as authorities, although passages therefrom may be adopted as part of an argument.