The origin of life on our globe is not accounted for on the basis of the evolutionary hypothesis. At some time in the remote past, there must, according to the theory, have been a development of living substance from a mineral base. But if scientific experiment has shown anything it has shown the unreality of what was called "spontaneous generation." This term was very popular with the scientists of a century or two ago. It was believed that certain animal and vegetable forms gave birth, in the process of decay, to insect life. Putrefying meat gives rise to maggots. The origin of these grubs was referred to the power of "spontaneous generation." When the Italian naturalist Redi discovered that an exclusion of flies from meat was all that was necessary to prevent the production of grubs, the doctrine of spontaneous generation was thoroughly upset, for his time at least. But the microscope revealed in "pure" water the presence of thousands of small creatures, the infusoria. Again spontaneous generation was appealed to in order to explain their presence. But the famous experiments of Pasteur (related by Huxley in his lectures on The Origin of Species, Lecture III), proved conclusively that sterilized water will not produce living forms when the germs floating everywhere about in the air are excluded. Since that time all men of science agree that there is no such thing demonstrable as spontaneous generation. It has become an axiom that "Life only comes from life." But how the first germs of life originated, is a question for which there is no answer. Huxley admits: "Of the causes which led to the origination of living matter it may be said that we know absolutely nothing." "The present state of knowledge furnishes us with no link between the living and the not living."