Both gratitude and affection prompt me to dedicate these lectures to you. To your kindness and self-denying labors I have been mainly indebted for the ability and leisure to give any successful attention to scientific pursuits. Early should I have sunk under the pressure of feeble health, nervous despondency, poverty, and blighted hopes, had not your sympathies and cheering counsels sustained me. And during the last thirty years of professional labors, how little could I have done in the cause of science, had you not, in a great measure, relieved me of the cares of a numerous family! Furthermore, while I have described scientific facts with the pen only, how much more vividly have they been portrayed by your pencil! And it is peculiarly appropriate that your name should be associated with mine in any literary effort where the theme is geology; since your artistic skill has done more than my voice to render that science attractive to the young men whom I have instructed. I love especially to connect your name with an effort to defend and illustrate that religion which I am sure is dearer to you than every thing else. I know that you would forbid this public allusion to your labors and sacrifices, did I not send it forth to the world before it meets your eye. But I am unwilling to lose this opportunity of bearing a testimony which both justice and affection urge me to give. In a world where much is said of female deception and inconstancy, I desire to testify that one man at least has placed implicit confidence in woman, and has not been disappointed. Through many checkered scenes have we passed together, both on the land and the sea, at home and in foreign countries; and now the voyage of life is almost ended. The ties of earthly affection, which have so long united us in uninterrupted harmony and happiness, will soon be sundered. But there are ties which death cannot break; and we indulge the hope that by them we shall be linked together and to the throne of God through eternal ages. In life and in death I abide Your affectionate husband, EDWARD HITCHCOCK. PREFACE.