IV. 1866-1867 71-83 _Medical Studies at Harvard._ LETTERS:-- To Thomas W. Ward 73 To Thomas W. Ward 76 To his Sister 79 To O. W. Holmes, Jr. 82 V. 1867-1868 84-139 _Eighteen Months in Germany._ LETTERS:-- To his Parents 86 To his Mother 92 To his Father 95 To O. W. Holmes, Jr. 98 To Henry James 103 To his Sister 108 To his Sister 115 To Thomas W. Ward 118 To Thomas W. Ward 119 To Henry P. Bowditch 120 To O. W. Holmes, Jr. 124 To Thomas W. Ward 127 To his Father 133 To Henry James 136 To his Father 137 VI. 1869-1872 140-164 _Invalidism in Cambridge._ LETTERS:-- To Henry P. Bowditch 149 To O. W. Holmes, Jr., and John C. Gray, Jr. 151 To Thomas W. Ward 152 To Henry P. Bowditch 153 To Miss Mary Tappan 156 To Henry James 157 To Henry P. Bowditch 158 To Henry P. Bowditch 161 To Charles Renouvier 163 VII. 1872-1878 165-191 _First Years of Teaching._ LETTERS:-- To Henry James 167 [Henry James, Senior, to Henry James] 169 To his Family 172 To his Sister 174 To his Sister 175 To his Sister 177