Picture - Cosmic Polymath

SPIRAL ARRANGEMENTS IN ANIMALS
Fir.. 2.
PLATE XIX
YlG. 1.
PLATE XX (continued)
Fig. 3.
Fig. 4.
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A. Vertebral column ; b, sterniun ; e, rib.9 ; d, scapula ; e, humerus ; /, radius ami ulna ; cj, bones of foot ; h, pelvis
i femur- j tibia and fibula; k, bones of foot. The bones of the limbs are not only twisted upon themselves but, in the
case of the radius and ulna, and the tibia and fibula, they twist round each other. The spirality resembles that seen in the bones of
the extremities of man (Plate xxi., Fig. 1) ; the wing of the bird (Fig. 185) ; the cast of the left ventricle of the heart (Plate xvii.,
Fig. 3) ; and certain trees (Plate xi., Figs. 2 and 3 ; Plate xlii., Fig. 1) ; fruit (Fig. 16), and horns (Plate xv.. Fig. 2, D, E).
Drawn by C. Berjeau from photograph specially taken for the Author.
Fig 4 —Transverse section of turbinated or scroll bones of human skull (after Hirschfeld and Leveille). The middle (a, h) and
inferior'(c^ d) turbinated bones are distinctly spiral in their nature ; the right ones (a,