﻿and Acoustic Phenomena attending the Fall of Meteorites. 255 



nomena hitherto observed. The fall of Knyahynia, July 9, 1866, 

 may serve for an example. The meteor approached the terres- 

 trial surface with only 6° zenithal distance, in a direction N. 76° 

 30' E. to S. 76° 30' W. It is certainly not to be supposed that, 

 subsequently to the explosion, a portion of the meteor would 

 have left the atmosphere under the same angle; nor 13 such a 

 supposition admissible in the fall of Orgueil, as described by 

 Professor Daubree. The following data are taken from his 

 communications to the Academy of Paris* : fig. 5 is the plan 



Fig. 5- 



19° TerroJZast 



East 



19° FerroEast 



of the region within which the phenomenon was observed. M. 

 Laussedat's report to Professor Daubree gives the important 

 fact that the meteor was seen falling down "vertically" at Ichoux 

 (Departement des Landes). The line B C in fig. 5 represents con- 

 sequently the projection of the meteor's course on the surface of 

 the earth. M. Lajous's report to M. Petit, dated from Rieumes 

 (Haute Garonne), supplies the following data : — Beginning, azi- 

 muthN. 24° W., altitude 22°; final term, azimuth N. 20°E.,alti- 

 tudel6J°; and hence we have,infig.6,AB = 29*49kiloms.(3-973 

 German geographical or 17*81 English miles), CD = 17*77 kiloms. 

 (2*394 geogr. or 11*24 English miles). Light first appeared at an 

 altitude of 29*49 kiloms. (3*973 geogr. or 17*18 English miles) ; 

 and the phenomenon ended above Orgueil and Nohic at an altitude 

 of 17*77 kiloms. (2*394 geogr. or 11*24 English miles). The fall 



44° 



May 30, 1864, Comptes Rendus Acad. Sc vol. lviii. 



