508 Capt. Kater's experiments, &c. 
Summer house above high water mark by the baro- 
meter, - 
Add for the fall of the tide, - - 
Summer house above low water, - - - 
Above low water by the Survey and Trigonometri- 
cal observation, - 
220.8 
10,0 
230.8 
2 53»° 
Difference 
22,2 
