 According to Heytesbury’s own words: “local motion by nature precedes other kinds [of change] just as the first” (De motu locali [DML] 2020: § 2, 270). He focuses on the possible measure of the speed of these changes by the effect produced (i.e., the space traversed) during an equal length of time. Consequently, he is interested in the kinematic aspect of motion (DML 2020: § 63,  296).[42]  Local motions are grouped into two classes: uniform and difform. A uniform motion is motion in which equal spaces are traversed continually in equal parts of time . Difform motions can vary in infinite ways, both with respect to the magnitude or the subject moved, and with respect to time (DML 2020: §§ 3–5, 270). Difform motion with respect to the subject moved is motion in which different points of the body move with unequal speeds; for instance, a rolling wheel moves with difform motion since different points on the wheel vary in regard to distance from the axis of rotation (DML 2020: §§ 9–16, 271–273). Difform motion with respect to time is motion in which unequal spaces are traversed in equal times. Motion can also be difform with respect to both time and the subject moved (DML 2020: §§ 17–20, 273–274). Difform motions are subdivided into two classes: the uniformly difform (uniformiter difformis) motion and the difformly difform (difformiter difformis) motion (DML 2020: § 21, 275). Uniformly difform motion is motion in which the speed either increases or decreases uniformly, that is, a motion in which in any equal parts of time, equal latitudes of speed are either acquired or lost (DML 2020: § 22, 275). A difformly difform motion is motion in which a greater latitude of velocity is gained or lost in one part of time than in another equal to it (DML 2020: § 40, 284).