Described are (1) some past works on psychological types of scientists, and (2) recent data collected at the University of Florida. The "science-minded types" are described, the frequencies of these types that can be expected to occur in high school students and teachers are discussed, and implications for conveying scientific information to the less science-minded public are considered. The Myers-Briggs Type Indicator is used to assess the theory of C. G. Jung. The instrument measures aspects of perception, judgment, extraversion, and introversion. These characteristics can be analyzed in various ways to yield analyses of samples of students and teachers. Data obtained by using the Myers-Briggs Indicator in a number of situations are used to provide information for the various sections of the paper. (RH)