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Rh conceived that to pass over so main a doctrine thus slightly, would not be treating it in a way, which its importance seemed to demand. Being persuaded that it was not a mere matter of nomenclature, but a most fundamental principle, which affected more or less all other parts of the subject, he was desirous of imparting to others, the like conviction of its utility and importance. In this new Edition, therefore, he has gone more largely into the question of value than before, having preferred to incur the charge of tediousness and prolixity, rather than omit saying anything that might render it more clear and intelligible to his readers, or meet the objections which had been urged against it by those whose opinions differed from his own. But before he had completed the whole of the alterations which he had in contemplation, and while he was yet occupied in correcting and improving the latter parts of the work, his mortal career was suddenly closed, and an end for ever put to his earthly labours.

What other changes he might have made, had his days been prolonged, it is of course not possible to say; but from the state in which his manuscripts were found, there is reason to believe that he had done all, or nearly all, that he considered essential.

Very little indeed has been required to put the work in a state fit for publication. The text has in some places been slightly varied, where a regard to perfect clearness or precision seemed to require it, some passages have been omitted, where the sense of them appears to have been better expressed in other parts of the work, and a few notes have been interspersed here and there, which if they add nothing to the force of the Author's reasonings, may serve still further to elucidate the several subjects to which they refer.