During my visit to London and Paris last year I had many talks with the materialistic philosophers of Europe. The basis of all their conclusions is that the acquisition of knowledge of phenomena is according to a fixed, invariable law,—a law mathematically exact in its operation through the senses. For instance, the eye sees a chair; therefore there is no doubt of the chair’s existence. The eye looks up into the heavens and beholds the sun; I see flowers upon this table; I smell their fragrance; I hear sounds outside, etc, etc. This, they say, is a fixed mathematical law of perception and deduction, the operation of which admits of no doubt whatever; for inasmuch as the universe is subject to our sensing, the proof is self-evident that our knowledge of it must be gained through the avenues of the senses. That is to say, the materialists announce, that the criterion and standard of human knowledge is sense perception. Among the Greeks and Romans the criterion of knowledge was reason; that whatever is provable and acceptable by reason must necessarily be admitted as true. A third standard or criterion is the opinion held by theologians that traditions or prophetic statement and interpretations constitute the basis of human knowing. There is still another, a fourth criterion, upheld by religionists and metaphysicians who say that the source and channel of all human penetration into the unknown is through inspiration. Briefly then, these four criterions according to the declarations of men are: First—Sense Perception; Second—Reason; Third—Traditions; Fourth—Inspiration.