494 



SCIEN'ri^IC RESULTS OE ZlEGLER POLAR EXPEDITION 



The heights of the whole series were reduced so as to make the mean difference between 

 the zero of the corrected staff and Bench Mark i correspond to 14.62 feet, which gives a mean 

 sea-level reading of 4.133 feet on the corrected staff. 



Elevation of bench marks above various tide planes 



