Population changes which have occurred within the black, Anglo, and Spanish surnamed populations in Texas from 1950 to 1970 were analyzed. This 20-year time span was selected because of the availability of the comparable census information for these groups. Three aspects of population dynamics examined were: growth, components of growth, and distribution. Data were taken from several U.S. Census Reports for 1950, 1960, and 1970. Some findings were that: (1) each group experienced an absolute increase in size during this time, with the Spanish surnamed having the largest increase and Anglos and blacks having the least; (2) despite this increase, their sizes relative to one another remained virtually unchanged; (3) the one single factor which accounted for most of the growth and the changes in growth rates was the fluctuations in the number of births; (4) migration was also an important factor affecting the size of the Spanish surnamed, but was of minimal consequence for the black and Anglo populations; (5) throughout the 1950's and 1960's, Texas' population was concentrating more and more in metropolitan areas, especially in the Houston, Dallas, and Fort Worth areas; and (6) the Anglo population increased in the areas outside the central cities while the black and Spanish surnamed populations increased inside the central cities. Some generalizations concerning present and projected population characteristics are also made. A problem encountered in this analysis was the possible undernumeration of the black and Spanish surnamed groups. (NQ)