“…One or all of these last-mentioned methods have been used by Rosen (1952Rosen ( -1957, Scheer (1955Scheer ( , 1957, Kos (1955), Meurman ( , 1957, Myers and Ronis (1956), Bellucci (1956), Portmann (1956Portmann ( -1957, Alexander, Cawthorne, Pick, Derlacki, Shambaugh, and Harrison (1957), and Goodhill (1955and Goodhill ( -1956. 2.…”