Trevelyan gives a detailed account of the history of ownership etc. of a [fossil?] rhinoceros horn found some years previously near Forfar. He comments on the geology of the Forfar district and that of the West Highlands. Trevelyan describes an excursion to Ben Nevis with Hooker. He refers twice to Lyell and describes discussion with Dr. Fleming in Perth about 'lake theories' and diluvian animals.