As in all other great sympathetic movements, the leaders of the advance in the matter of the humane treatment of animals are occasionally unreasonable in their demands--it may well be held that the prophet has to be unreasonable in order to attain his goal; hence it has come about that the demands of these admirable people are often beyond the bounds of things that are practicable. Fire-horses, however ill, should be made to do their duty, even if it costs them any amount of suffering; even as the artillerymen should, if the occasion calls for it, rush their teams, though they know that the poor beasts are to die at the goal. In a word, the only and supreme test of our relations to these subjects is the well being of man considered from the higher point of view. This principle we apply to our own kind; we are justified in like action in case of the brutes. In this consideration, the offence to the feelings of man which is caused by any act of cruelty, however necessary, deserves its due weight. The most serious matter connected with the question of the rights of animals which is now under discussion relates to the use of these creatures in the investigative work of the naturalist, or in the repetition of the processes and results of those inquiries before students. Although all judicious people are likely to welcome the exceeding reprobation with which many philanthropists visit the vivisectionists, and this for the reason that the state of mind shows a rapid advance of the sympathetic motive, they are likely to question the sound foundation of the objections that are raised to experiments with animals, made for the purpose of discovering of displaying the truths of nature.