In bringing to a close this inadequate review of the book something yet remains to be said. It should be unnecessary to repeat that in pointing out literary defects and mistakes, we do not touch the honour of the writer in any way. How can one measure the weight of a life- long prejudice, or determine its influence upon conduct or opinion? "Tout comprende est tout pardonner." Within a few weeks, the author of "Animal Experimentation," if living, will enter upon his eightieth year. The errors of judgment, the inaccuracies of statement, the tendency to exaggerate utility--these and all other literary defects of the volume before us must be recognized and deplored, but they should be ascribed only to causes which do not affect the honour of the man. We may be confident that after he has passed away, the world will quickly forget the too zealous defender of unrestricted vivisection, and remember, finally, only the wise teacher, the skilled surgeon, the trusted friend. APPENDIX II In the acquirement of knowledge concerning vivisection, and for the prevention of abuses, it is essential that in every institution where experiments are performed a register of all animals received be carefully and accurately kept. Each one should have a serial number, under which all particulars should be entered. The book used for this purpose should have printed in the first column of each double page the required details concerning which a record is to be kept; the blanks should be written in ink by someone responsible for its accuracy. Some such form as the following outline might perhaps be used for such register: REGISTER OF ALL MAMMALIAN ANIMALS RECEIVED FOR EXPERIMENTATION IN THE CARNEGIE LABORATORY DURING THE YEAR 1920.