[ 59 ° ] 
obfervation. The times fet down are exadt to the 
minute. 
What I endeavoured to attain by thefe experiments 
was the altitudes of high and low water, and the 
times of their happening. I generally began to ob- 
ferve the water fome time before the expected time 
of high or low water, and continued the oblervations 
till the water either fell or rofe. But it appears from 
the experiments that the water does not vary fenfibly 
for 20 minutes or more from the times of high or 
low water. On this account it was impoflible to find 
thefe times by diredt obfervation, to any degree of 
accuracy ; I therefore took equal altitudes of the water 
bofore and after, from whence thefe times may be 
inferred with fome degree of exadtnefs ; you will 
perceive, by the times, that many of the obfervations 
were made in the night. In this cafe a perfon held 
a lanthorn to give light to the water, and the figures 
on the poff, railing and finking the lanthorn alter- 
nately, as the water rofe or fell, while I obferved the 
altitude of the water by the pod. 
I think that nothing remains further to be faid, in 
explanation of the obfervations, but to take notice of 
the contents of each column in the table of obferva- 
tions. The firft column contains the day of the 
month; the fecond fhews the apparent time; the 
next column contains the altitude of the water accord- 
ing to the figures on the pod, which are each 3 inches 
alunder, derived from a mean of feveral obfervations, 
the number of which is fet down in the following 
column. The figures H. L. in this column fignify 
that thefe are the altitudes at high and low water. 
The lad column contains remarks on the date of the 
water, 
