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CHAPTER XXII. 
Plate XXXIX. — astronomy. 
Fig. 1,2. The remarkable ring which surrounds the planet 
Saturn. 
Fig. 3. The earth an oblate spheroid. See note, p. 217. 
Fig. 4. See note, p. 220 
Fig. 5. See note, p. 223. 
Fig. 6 . Centripetal forces illustrated. See notes, pp. 219,226 
