Letter, 21 November 1869
Letter, 21 November 1869
Letter, 23 December 1869
Letter, 23 December 1869
Letter, 10 October 1869
Letter, 13 September 1869
Notebooks of chemical lectures, 1869-1870
Lecture and laboratory notebooks, 1869-1870
Notebooks, 1869-1870
Letter, 11 October 1869
Letter, 11 October 1869
Letter, 14 October 1869
Letter, 14 October 1869
Letter, 5 December 1869
Letter, 5 December 1869