Mr Milne Home stated that he had been induced to resume his researches in the Lochaber district, in consequence of a lecture, in June last, by Dr Tyndall of London, at the Royal Institution, Albemarle Street, and subsequently printed and published. In this lecture, Dr Tyndall controverted the detrital theory of lake barriers, and advocated the glacier theory;—supporting his views by a reference to observations which Dr Tyndall said he had recently made on a special visit to the Parallel Roads.