Geology and Natural History. 523 
its representation 47°42 feet of water. These extraordinary fluc- 
tuations were not attended by any peculiar state of the weather, 
and happened twelve days before there were any indications of 
growth to be detected in the buds. se observations are be- 
lieved to be quite new, and as yet inexplicable, but will receive 
further attention another spring. 
The maximum pressure of the sap for the season was observed 
at 10 a. m., April 11th, and was equal to sustaining a column of 
water 31°73 feet high. This was an excellent sap-day, consider- 
ing the lateness of the season. There was noticed a general cor- 
feature of this fact is, that though apparently produced lag bags 
i i ined the s 
gauges at once began to show diminished pressure, while sap 
from the tree, notwithstanding the enormous pressure 
already existing. i 
he hole opposite the 
lower gauge, it was found that the communication between it and 
