The paper of Feinblatt and Ferguson published elsewhere in this issue of the Journal demonstrates the importance of critical re-evaluation by each physician, not only of his own methods but also of the use of new diagnostic and therapeutic tools. Such tools are being developed in increasing numbers by the active pharmaceutical industry, and it is much too easy to accept without question the glowing advertising claims, which are accompanied by reprints and bibliographies to give added authority.The absorption of drugs by the gastrointestinal tract has always posed a problem. The variations in dosage to obtain the same results . . .