They took the patients' elevator rather than the bounce tube out of deference to Cavendish's age, then rode a slide-away for a long distance past laboratories, therapy rooms, solaria, and ward after ward.  They were stopped once by a guard who phoned ahead, then let them through; they were at last ushered into a physio-data display room used for watching critically ill patients. "This is Dr. Tanner," Berquist announced. "Doctor, this is Mr. Caxton and Mr. Frisby." He did not, of course, introduce Cavendish.