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In the article by Dr. Edwin Beer in The Journal, December 5, page 1886, the reference in the second column to the illustrations should have been to figures 1 to 6. Under figure 4 the legend should read "Excretory cystogram after voiding, showing stone outside the bladder shadow in the ureter meatus." Under figure 5 the legend should read "Excretory cystogram before voiding, showing intrusion of large intravesical prostate." This was introduced to compare with figure 6, in which after voiding there was practically no residual urine, as evidenced in the urogram.
Visualization of the Amount of Residual Urine. JAMA. 1936;107(25):2060. doi:10.1001/jama.1936.02770510050018