The circulation being always zero round a small plane curve passing through the axis of spin in vortical motion, it follows conversely that a vortex filament is composed always of the same fluid particles; and since the circulation round a cross-section of a vortex filament is constant, not changing with the time, it follows from the previous kinematical theorem that aw is constant for all time, and the same for every cross-section of the vortex filament. [Please select]
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Each law of nature has the like universality; eating, sleep or hybernation, rotation, generation, metamorphosis, vortical motion, which is seen in eggs as in planets. [Please select]
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The form above this is the vortical, or perpetual-spiral; next, the perpetual-vortical, or celestial; last, the perpetual-celestial, or spiritual. [Please select]
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