549 



assured, that horses had, been seen, near Calabozo, suspended 

 and inverted, without exhibiting any direct image." 



All that precedes was written at Cumana, toward the end 

 of 1800. The last phenomenon was reported to me by per- 

 sons of good authority. It appears to me analogous to that 

 described by Mr. Vince, which Mr. Biot has so well ex- 

 plained in his " Recherches sur les Refractions extraordi- 

 naires," 1810, p. 239, fig. 40 bis. Two images of a ship 

 were seen, the uppermost of which was inverted. In the 

 work I have just quoted, Mr. Biot has discussed a part of the 

 measurement I took during my stay in the torrid zone. The 

 following is the reduction of the zenith distances (ancient 

 sexag. division, for the days of the greatest suspension. 



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