I can not refrain from referring, with sentiments of admiration and gratitude, to my friend Thomas Maclear, Esq., the accomplished Astronomer Royal at the Cape. I shall never cease to remember his instructions and help with real gratitude. The intercourse I had the privilege to enjoy at the Observatory enabled me to form an idea of the almost infinite variety of acquirements necessary to form a true and great astronomer, and I was led to the conviction that it will be long before the world becomes overstocked with accomplished members of that profession. Let them be always honored according to their deserts; and long may Maclear, Herschel, Airy, and others live to make known the wonders and glory of creation, and to aid in rendering the pathway of the world safe to mariners, and the dark places of the earth open to Christians! I beg to offer my hearty thanks to my friend Sir Roderick Murchison, and also to Dr. Norton Shaw, the secretary of the Royal Geographical Society, for aiding my researches by every means in their power. His faithful majesty Don Pedro V., having kindly sent out orders to support my late companions until my return, relieved my mind of anxiety on their account. But for this act of liberality, I should certainly have been compelled to leave England in May last; and it has afforded me the pleasure of traveling over, in imagination, every scene again, and recalling the feelings which actuated me at the time. I have much pleasure in acknowledging my deep obligations to the hospitality and kindness of the Portuguese on many occasions. I have not entered into the early labors, trials, and successes of the missionaries who preceded me in the Bechuana country, because that has been done by the much abler pen of my father-in-law, Rev. Robert Moffat, of Kuruman, who has been an energetic and devoted actor in the scene for upward of forty years. A slight sketch only is given of my own attempts, and the chief part of the book is taken up with a detail of the efforts made to open up a new field north of the Bechuana country to the sympathies of Christendom. The prospects there disclosed are fairer than I anticipated, and the capabilities of the new region lead me to hope that by the production of the raw materials of our manufactures, African and English interests will become more closely linked than heretofore, that both countries will be eventually benefited, and that the cause of freedom throughout the world will in some measure be promoted. Dr. Hooker, of Kew, has had the kindness to name and classify for me, as far as possible, some of the new botanical specimens which I brought over; Dr. Andrew Smith (himself an African traveler) has aided me in the zoology; and Captain Need has laid open for my use his portfolio of African sketches, for all which acts of liberality my thanks are deservedly due, as well as to my brother, who has rendered me willing aid as an amanuensis.