4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. ']■] 



During the month of January, 1923, there were certain changes of 

 apparatus and methods of reduction introduced at Montezuma. In 

 connection therewith occurred some uncertainties not yet fully under- 

 stood. This has caused us to omit some of these values from Mon- 

 tezuma. During the summer months at Harqua Hala, there have also 

 been many days when haziness and thunder-storm conditions have 

 led to such uncertainties as to cause us to omit them. With these 

 explanations, we proceed to give table i. 



