Abstract
1. Quantitative studies of the roots of nineteen species of plants in fourteen different angiosperm families were made. Results indicating the total number of roots and root lengths are presented in tabular form. 2. Tertiary roots produced about one quaternary root per centimeter of length in most of the plants examined; however, the number of secondary and tertiary roots developing from main and secondaries, respectively, varied considerably. 3. Variation in number of roots and root length results from differences in size of plant, age, inheritable stability, and competition with other plants. Generally, plants show a compensating factor in root growth; when restricted in one category, another root division or two will exhibit much greater growth.
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