. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. hence, cseteris panbus, the resistance is as the square of the velocity. t Let A B (fig. 215) he the plane, and B D the direction of its motion, A B D the angle whose sine is s, the number of particles which strike the plane, •as well as the force of each particle, will be climi- Tiislied in the ratio of 1 to s, therefore the whole resistance will be diminished in the ratio of 1 : s2, but the effective part of the resistance being per- pendicular to the plane, the whole resistance in the direction A E is to the effective
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. hence, cseteris panbus, the resistance is as the square of the velocity. t Let A B (fig. 215) he the plane, and B D the direction of its motion, A B D the angle whose sine is s, the number of particles which strike the plane, •as well as the force of each particle, will be climi- Tiislied in the ratio of 1 to s, therefore the whole resistance will be diminished in the ratio of 1 : s2, but the effective part of the resistance being per- pendicular to the plane, the whole resistance in the direction A E is to the effective part in the direction B E perpendicular to A B, as A E and B E, But the forms of animals, though symme- trical, can rarely be considered as mathemati- cally regular figures, and consequently many of the data for calculating the resistance to their movements must be derived from experi- ment. Passive organs of locomotion. Bones.—The solid framework, or skeleton of animals which supports and protects their more delicate tissues, whether chemically composed of entomoline, carbonate, or phosphate of lime; whether placed internally or externally; or whatever may be its form or dimensions, presents levers and fulcra for the action of the muscular system, in all animals furnished with earthy solids for their support, and possessing locomotive power. The form, strength, density, and elasticity of skeletons vary in relation to the bulk and locomotive power of the animal, and to the media in which it is destined to move. or as 1 to s. Hence the whole resistance in the direction of the motion will be diminished in the ratio of 1 : s3, and will therefore be a p ^ ^ (10.) * Letbeitd (fig. 216)be the section through the axis ca of the body whose motion is in the direction of c a, draw the tangent e g to any point of the curve meeting the axis produced ing-, draw the ordinates e f and e f indefinitely near each other, also draw e' a' parallel to g c, then let c/— x, e f ~ y, b e ~ z,
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