The most important contribution to the understanding of renal function in the decade 1951-1960 was the "Haarnadel-Gegenstromsystem" (Counter-current multiplier system) theory of Wirz. Because of its importance, the investigators who were responsible for the exposition and modification of the theory, as well as its experimental support, came to be in great demand as speakers and authors. By 1959, the group was appearing in public together so frequently that it became known by the irreverent title of "The Traveling Circus." During that year, the Circus pitched its tent on American soil in at least three places from which issued bound volumes containing material virtually identical to that contained in the present work.
This is not to suggest that reexposure to such classical work is totally without merit. Among the most noteworthy features of this book is the exquisitely detailed summary of Giebisch's painstaking measurements of electrical potentials and ion fluxes in