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My initial comments applied to Dr. Hsieh's original paper. His reply contains an additional assumption not made previously; namely, that the vortex always consists of the same fluid particles. Also, he now considers a fixed region in the vicinity of the center, rather than following a "fictitious point at the surface moving so as to remain directly under the center of the upper vortex." In view of these changes, it appears desirable to add a few remarks.
The article of record as published may be found at http://dx.doi.org/10.1175/1520-0469(1951)008<0206:AC>2.0.CO;2