On certain occasions, reviewers of earlier contributions in the field of religion, philosophy and social life, draw our attention to the relevance of the earlier teachings, concepts and practices to the modem times also. It is not uncommon to note that in science, as it progresses, thanks particularly to advances in techniques and instrumentation coupled with inputs from many related fields, some of the well-known concepts and laws get to be abandoned or modified. In the present case, Twidale ["Canons" revisited and reviewed: Lester King's views of landscape evolution considered 50 years later, GSA Bulletin, v. 115(10), pp. 1155-1172, 2003] has made an attempt to see how far Ihe 'canons' of Lester King, put forth about hal fa century ago (Canons of landscape evolution, GSA Bulletin, v.64, pp.721-752,1953), to explain the variations in landscape evolution, are valid now.
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