74 DR. FREUDENBERG 



seclion. Such phenomeiia of former glacieis can be found Ihrough the 

 iipper regioiis of Iztacciliuatl. 



On Dec. 31, I proceeded slowly willi my giiides over broken rocks 

 along the western walls of the Cerro Gordo above a snow free "Kar" 

 of Apallaco at the soiith -western base of llie inonntain. I noted par- 

 liciilarily the direclion in wliich the lava ílowed in this región, and 

 reached the conclusión tliat tlie sonlh- western kar was a deep de- 

 pression when Iztaccihnatl Wiis still active. Tliis was shown by the 

 dippingá of andesite agglomerate from Iztaccihuatl into the above 

 nientioned kar. 



In comparison with Iztaccihuatl, tlieformation of the cone of Popo- 

 catepetl is of much later date than all the eruptions of Iztaccihuatl- 

 Iztaccihuatl ¡s now to be nanied the ruin of a volcano. 



The chief mass of Popocatepetl might be considered a posfglacial 

 volcano, for the aclion of ice may be seen only on its norlh- western 

 face in the form af a kar undfrnealh its ÍSomma, the Pico del Fraile. 



On the 31 cf Deceniber at 3 p. in. I sent my guides back to Popo 

 i'ark with mosl of the baggage, from a spot behind the Cerro Gordo, 

 as the weight of their burden made rapid transit impossible. I threa- 

 ded my way between two other kars changing from one side of the 

 ridge to the other unlil 1 arrived under the very top of the most south- 

 erly snow peak of the mountain. I passed New Years night in a 

 rocky cave, or rather a fissure which barely permilled me to lie down. 

 The night was extremely cold and tliere was no wood for a fire. I rose 

 with the sun on Jan. 1 and climbed np the steep ridge which leads to 

 the snow fields of Iztaccihuatl. 



My ice axe and geologist's hammer served me very well. I only 

 regretted the absence of snow shoes for use on the rather fíat snow 

 fields which cover the" VVoman in White." I could distinguish on the 

 east side of Iztaccihuatl three different kars to the north of the Cerro 

 Gordo. The most southerly was practically free from snow. The se- 

 cond contained snow fields. The third one w;is completely filled with 

 glacier. 



On the western side there is the above named kar that passes in 



