In preparing a Second Edition of the following treatise, the author has endeavoured to avail himself of every assistance in his power, from books, observation, and the communications of some literary friends, to whom he is indebted for several judicious remarks. In comparing the opinions of different critics, it was not to be expected that all should be found to agree together. It sometimes happened that one approved what another would have rejected. If the author has not adopted every hint that was offered him, but used the privilege of exercising his own judgment, the responsibility must rest with himself. He hopes those gentlemen who most obligingly favoured him with their remarks will forgive him for mentioning their names, for he is unwilling to withhold from the public the satisfaction of knowing that he has had the best assistance which his country could afford him in compiling and modelling his work. He thankfully acknowledges his obligations to the Rev. Dr Robertson, of Callander; Dr Graham, of Aberfoyle; Dr Stuart, of Luss; Dr Macleod, of Kilmarnock; and Mr Irvine, of Little Dunkeld.

From these sources of emendation, omissions have been supplied, idiomatic phrases have been collected and inserted, some alterations have been made by simplifying or compressing particular parts, and new examples and illustrations have been introduced throughout, according as the advantages which the author enjoyed enabled him to extend his knowledge of the language, and served to correct, or to confirm, his former judgments. He thought it might be acceptable to Gaelic scholars to have a few lessons subjoined as exercises in translating and analysing. For this purpose he has selected some specimens of original prose composition, extracted from unpublished manuscripts, and from the oldest Gaelic books that are known to be extant. These specimens, short as they are, may suffice to exhibit something of the powers and elegances of the language in its native purity, unmixed with foreign words and idioms, as well as to show the manner in which it was written two or three centuries ago.

The present edition owes its existence to the generous patronage of Sir John Macgregor Murray of Lanrick, Bart., to whom the author is happy in avowing his obligations for the unsolicited and liberal encouragement given him in the execution and publication of his work. To the same gentleman he is indebted for the honour of being permitted here to record the names of those patriotic sons of Caledonia who, in concert with the honourable baronet, and at his suggestion, though residing in the remote provinces of India, yet mindful of their country's fame, contributed a liberal sum of money for promoting Celtic literature, more especially for publishing the poems of Ossian in their original language. It is owing, in a principal degree, to their munificent aid, that the anxious expectation of the public has been at last so richly gratified by Sir John Sinclair's elegant and elaborate edition of the poems of that tender and lofty bard.