Abstract
The problem of absorption confronts the scientific investigator in practically every field of human endeavor, in the exact as well as in the practical fields, and the mass of information thus gained will eventually lead to a more intelligent understanding of the detailed mechanism of absorption, though widely differing especially in the finer points in each special field. The inadequacy of in vitro explanations alone for biologic purposes is now and again emphatically decried by some students and with some justification, so that it would seem that the final court of decision must at present still rest in tests performed under actual existing in vivo conditions. In the biologic and medical sciences, our problem resolves itself into the solution of a complicated mechanism at the basis of which lies the intricate biology of the cell, the complexities of which we are just beginning to unravel by means of controlled researches.

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