The vaginal smear has been established as a valuable aid in the diagnosis of uterine cancer.1While neither biopsy nor vaginal smear will disclose all cases of malignant uterine growth, the two methods used in conjunction have been shown to make diagnosis possible in 98 per cent of 181 cases.2In our hands the vaginal smear has proved of unique value in the detection of carcinoma of the cervix in the early (noninvasive) stage.3Gates and Warren,4in a recent critical evaluation, stated, "Even taking into account differences in criteria, these figures suggest a distinct advantage in favor of the smear method" in the detection of carcinoma in situ of the cervix. In 1943, our associates and we1demphasized the value of the vaginal smear as a screening procedure for the discovery of early uterine cancer and advised "incorporation of this method of diagnosis as