CHAPTER V. SECOND JOURNEY IN EUROPE. CORRESPONDENCE. 1850-1859. CHAPTER VI. LETTERS TO DARWIN AND OTHERS. 1860-1868. CHAPTER VII. TRAVEL IN EUROPE AND AMERICA. 1868-1880. CHAPTER VIII. FINAL JOURNEYS AND WORK. 1880-1888. EDITED BY JANE LORING GRAY IN TWO VOLUMES BOSTON AND NEW YORK |