No one will question that these various and momentous results are the legitimate effects or answers to prayers. But whether prayer can influence the working of the material forces external to the individual is a disputed point. If it cannot in some way do this, prayers for rain, for harvests, for safety at sea, for restoration to health, for delivery from grasshoppers[131-3] and pestilence, whether for our own benefit or others, are hardly worth reciting. A physicist expresses the one opinion in these words: “Science asserts that without a disturbance of natural law, quite as serious as the stoppage of an eclipse or the rolling of the St. Lawrence up the Falls of Niagara, no act of humiliation, individual or national, could call one shower from heaven or deflect toward us a single beam of the sun.” “Assuming the efficacy of free prayer to produce changes in external nature, it necessarily follows that natural laws are more or less at the mercy of man’s volition.”[132-1] This authoritative statement, much discussed at the time it was published, does not in fact express the assertion of science. To the scientific apprehension, man’s volitions and his prayers are states of emotion, inseparably connected in their manifestations with changes in his cerebral structure, with relative elevation of temperature, and with the elimination of oxygen and phosphorus, in other words with chemico-vital phenomena and the transformation of force. Science also adds that there is a constant interaction of all force, and it is not prepared to deny that the force expended by a national or individual prayer may become a co-operating cause in the material change asked for, even if the latter be a rain shower. This would not affect a natural law but only its operation, and that much every act of our life does. The fact that persistency and earnestness in prayer--_i. e._, the increased development of force--add to its efficacy, would accord with such a scientific view. It would further be very materially corroborated by the accepted doctrine of the orders of force. A unit of electrical or magnetic force equals many of the force of gravity; a number of electrical units are required to make one of chemical force; and chemico-vital or “metabolic” force is still higher; whereas thought regarded as a form of force must be vastly beyond this again. To render a loadstone, which lifts filings of iron by its magnetic force, capable of doing the same by the force of gravity, its density would have to be increased more than a thousand million times. All forces differ in like degree. Professor Faraday calculated that the force latent in the chemical composition of one drop of water, equals that manifested in an average thunderstorm. In our limited knowledge of the relation of forces therefore, a scientific man is rash to deny that the chemico-vital forces set loose by an earnest prayer may affect the operation of natural laws outside the body as they confessedly do in it.