This issue contains again a few Letters on a subject sometimes derided as "numerology." Our first reaction, and that of many referees, is to reject such Letters because the content of these papers has no relation to any present theory, nor do they propose any new theories to explain their results. On second thought, however, we believe that this negative attitude is wrong. The great successes of theoretical physics in the 1920's and 1930's have given us the false impression that all physics is theory. At present most experiments are only undertaken to prove or disprove a theory. In fact, some experimental teams employ a theorist somewhat in the role of a court astrologer to tell them whether the stars in the theoretical heavens favor the experiments they are planning. The motto of the famous Kamerlingh-Onnes low-temperature laboratory, "Door Meten tot Weten" (knowledge through measurement), appears to have become obsolete. It has been forgotten that careful observations can lead to empirical rules long before there is a theory. Boyle, Rydberg, and Geiger and Nuttall had no theories to guide them in discovering their important laws.