350 TRANS. OF THE ACAD. OF SCIENCE. 
character could not, in consequence of the darkness of the 
night, be dete rmined, 
Dec. 18. Wen arose this stays Hace: at an early hour, and by 
54 h. A. M., were again on our journey, taking a southerly 
course in the direction of the Ojo del Muerto.” Our road was 
ni 
Da und i . 
crusted frequently with "a chalky substance. The surface of 
the A Some is thickly coated with coarse reddish sand, and 
