Prussia, Italy, and Germany, we have received many complimentary opinions, but these expressions will be to us only the incentive to do better work to more richly deserve them. For contributions to the present volume our best thanks must be offered to Sir Roderick Murchison, Mr. C. Carter Blake, Mr. Pengelly, Mr. J. Elliott, Mr. S. P. Woodward, Mr. Andrew Taylor, Dr. Rubidge, Professor T. Rupert Jones, Mr. W. Murray, the Rev. S. Lucas, Count Marschall, Director Haidinger, Professor King, Professor Huxley, Professor Busk, Professors Dana and Silliman, Mr. Du Noyer, Mr. Guppy, Mr. Wyatt, Dr. Wilkins, Mr. James Plant, Mr. Bensted, Mr. John Taylor, Dr. Gibb, Rev. Hugh Mitchell, Professor Ansted, Professor Harkness, Mr. Charles Moore, Mr. Wynne, Mr. Sorby, Mr. Davidson, Mr. C. B. Rose, Rev. J. Crompton, and Mr. W. Bollaert. S. J. MACKIE.
