82 



VOLCANO POPOCATEPETL AND ITS VICINITY 



Or, if all co-ordinates are referred to the western peak of the Popocatepetl as 

 zero point, the results are as follows: — 



These co-ordinates, changed into minutes and seconds of arc, give the following — 



GEOGRAPHICAL POSITIONS. 



Popocatepetl, Western peak 

 " Eastern peak . 



" Pico del Fraile 



Rancho Tlamacas . 



Ixtaccihuatl, Highest peak . 

 " South peak 



" station B 



