As I have already stated, the scientific dabbler prefers to disport himself in the field of theory. And, at present, there are several great questions up for discussion before the scientific world. The most prominent among them relate to the connection between vital and physical forces, the origin of life, the development of species, and the antiquity of man. In genera], the pulpit has in the most Christian manner allied itself with the weaker side. In many instances, the press follows the lead of the priesthood. And on each question there seems to be popular misunderstanding.
The first of these questions is practically settled. Experiment has thrown much light upon it, and now the leaders in science are pretty well agreed that the ordinary forces of Nature are sufficient to produce all the physical phenomena of life. And yet, when a well-known chemist, a year or two ago, stated, before a New York audience, the simple fact that the animal heat is the result of purely physical actions in the system, an astute letter-writer took him roundly to task for his "absurdities," and actually found a newspaper to print the effusion. The lecturer stated an experimental fact, while the objector merely vented ignorant prejudice. If a man who had never learned to read should attempt to instruct an experienced printer in the art of setting type, he would hardly present a more ridiculous spectacle than this self-appointed critic.
In discussing the origin of life, we find the theory of spontaneous generation brought prominently forward. Certain experimenters have enclosed various substances in hermetically-sealed tubes, heated them, so as to apparently destroy all possibilities of life within, and, after allowing them to remain undisturbed for months, have found the contents swarming with animalcules. Other scientists have tried similar experiments under varied circumstances, and have failed to obtain living organisms. And no one but a man trained in scientific methods can judge of the relative values of the experiments. Yet many clergymen do not hesitate to decide at once in favor of the negative experiments, in spite of the fact that no thorough scientist regards the questions involved as in any degree settled. The leading opponents of spontaneous generation seem to oppose the doctrine only provisionally, on the ground that the evidence accumulated is not sufficient to warrant a final decision. The weight of evidence, however, seems to lend probability to the doctrine. The successes of Wyman, Bastian, and others, more than counterbalance all failures. Yet more exact experiments are needed. It is plain that the first life must have been developed from non-living matter, whatever methods the Creator may have employed. Why may not the same methods be acting to-day? The clerical opponents of the theory here fall into an obvious error. They impute to it tendencies which it cannot have. The question to-day is, not whether life arose by a Divine act, but, in what manner did it arise? If it should be proved that living beings may be produced by natural laws
