I beg to express my best thanks first and foremost to the Curators of the Taylor Institution, not only for their honourable invitation to lecture at Oxford, but also for their liberality in undertaking the printing of the Lectures at the cost of the endowment; next, to all those who have met me with kindness, as well with respect to the present work, as during my stay in England. Among them I must be allowed to offer my special thanks to one of the Curators, the Rev. G.°w. Kitchin, who has also kindly assisted me in reading the proofs, an assistance all the more valuable in that it has been afforded to one who is writing in a foreign language.
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