These are the opinions of experts. This attitude of uncertainty is the only ground possible for a scientific man who aims at stating the whole truth. When a professional vivisector gives us assurance that no pain was felt during the severest operations, he is only putting forth an opinion. He is but mortal. We are not obliged to assume his infallibility in a region where experts are in doubt, and where there may be a desire for concealment. During the last decade of the nineteenth century, a work was published describing in detail experiments upon surgical shock--so termed to distinguish it from a similar condition arising from overwhelming emotions. These experiments were almost exclusively made upon dogs, man's faithful friend and companion; and their number was so great and their character so horrible that their publication at first excited general criticism and condemnation. At one the suggestion was put forth that the experiments were painless, because "anaesthetics were employed." The vivisector had said: "In all cases the animals were anaesthetized, usually by the use of ether, occasionally by chloroform, either alone or with ether. In a few cases CURARE AND MORPHINE WERE USED." In a number of succeeding volumes, the same assertion has been put forth; and as understood by the average reader, it has tended to dispel doubts regarding the character of the experiments. It seems worth while to examine the account of these investigations a little closely. The question for us is not whether anaesthetics were employed, but to what extent we may find ourselves assured regarding their efficiency in abolishing sensibility in every case.