Placing this instalment in sequence is troublesome. The comments Matthew makes suggest it was written later than the first version of the book, and after receiving proofs, or even after the print run was completed. But it is not obvious whether it comprised an instalment of its own, subsequent to the second instalment, or whether that new material and this, was collected to comprise one submission. Either way, the net new material in this final instalment was as follows, The final manuscript comprised, a book on timber and marine, including a critique of Matthew's competitors in arboriculture, his scathing attack on entail, and significantly in retrospect, the expanded account of a natural law he called a natural process of selection, added as afterthought, but central to his argument against degeneration of nobility through entail, and its culmination into the recent rebellion on the Continent. Significance of the addendum The addendum therefore comprises the colophon and erratum, and before them, the all important exposition of Matthew's evolutionary concept, his "natural process of selection", In the appendix he elaborated on comments in the main text on how artificial selection—the elimination of trees of poor timber quality from the breeding stock—could be used to improve timber quality, and even create new varieties of trees. He extrapolated from this to what is today recognised as a description of natural selection. Although his book was reviewed in several periodical publications of the time, the significance of Matthew's insight was apparently lost upon his readers, as it languished in obscurity for nearly three decades. The only library in Perth at the time banned the book. Despite the suggestion that this through the librarian, "having no doubt spotted its hidden heresy", considering the historical context, it is more likely that the heretical content would be seen as the attacks on Sir Walter Scott, Paley's teleological immutability by Special Creation, and his other gripe, nobility and entail. Of Paley's Theological Naturalism, alternatives from Buffon transformatism and Lamarck unguided evolution still assumed a divine Creator. There is nothing to say Matthew was any different, such as evidence of him being an atheist (quite the opposite in fact). Also, Matthew's dealings in Perthshire, his personal and political opinions made public, were sometimes not well received. Reviews On Naval Timber was reviewed in at least 6 periodicals between 1831 and 1833. A further review appeared in the Gardener's Chronicle in 1860,