Plate I. Frontispiece.

Plate II. A Vortex Ring, illustrating the perpetually spiral form and interior fluxion of finites 18

Plate III. A Bulla of the First Aura 28

Plate IV. A Bulla of the Second Aura 38

Plate V. The Solar Vortex 72

Plate VI. A Bulla of the Third Aura, or Ether .... 87

Plate VII. A Bulla of the Fourth Aura or Aerial Elementary

Diagram, illustrating the series of Finites and Auras and their mutual relations 96

Plate VIII. Group of nine molecules of Water 102

Plate IX. The same group, with central molecule collapsed 103

Plate X. The Salt Particle 103