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By Baxter G.P., Grover F.L.

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This extraordinary progress becomes even more astounding reflect that, in so far as propagation of ideas is concerned, those two centuries were like two decades in our own time. Remember, indeed, that the habit of putting down when we one's thoughts in writing was practically nonexistent in those days; that such manuscripts as did live to see the light of day could be reproduced only by laborious copying; that mathematical nomenclature was in its infancy, and symbolism did not exist at all, since even the designation of vertices of figures by letters of the alphabet was not known before Hippocrates; that in the absence of a centre of mathematical activity such as Alexandria in the post-Euclidean centuries, mathematics was being cultivated in widely separated regions; that the exchange of ideas among scholars was largely by personal contact, and that a journey from Asia Minor to Lower Italy, which today can be accomplished in less than three hours by plane, required then many a month.

Suppose next that at another time of the day the respective shadows of the two posts are HT' and ht'\ these, too, are proT'T: TH. portional to the altitudes. It follows that ft th In particular, if ft then T'T TH. th, : = = = Returning now to the situation which allegedly confronted ha designate the position of the man whom he was observing, and let ht be the shadow of the man at the time of the afternoon when one's shadow equals one's height; finally, be the tip of the shadow cast by the Pyramid at that let time.

Now, given the privilege of selecting the traits to be compared, the freedom of choosing and grouping the specimens which are to be measured for these traits and a latitude in the degree of precision allowed in interpreting the data measured with all these liberties at one's disposal, one should be able to turn any recondite mystery into a mathematical law, and, as a matter of fact, into a law assigned in advance. This sounds like accentuating the obvious, and so it is. But, evidently, it is in not so obvious to the authors of some of the studies, biometric, econometric, psychometric, which have come to my notice.

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A Revision of the Atomic Weight of Lead (1914)(en)(7s) by Baxter G.P., Grover F.L.

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