'76 BULLETIN OF THE NATURAL HISTORY SOCIETY. 



high water for all the tides in a month whose exact time ot high 

 water to low water could be read accurately enough to Ije the 

 basis for an estimate. Out of the thirty-six complete tides there 

 recorded, thirty-four show a greater length of time from high 

 water to l<j\v water than from low water to high water. The mean 

 delay of low water is eight minutes, or the time from high water to 

 low water is on the average sixteen minutes greater than the time 

 from low water to high water. It should be noted that this 

 delay of low water in St. John harbour is not due to the fact 

 that the harbour is at the mouth of a large river ; this would 

 tend to have exactly the opposite effect. For, shortly l)efore low 

 water would naturally occur, the inflow from the river neutralizes 

 the outflow into the bay and thus causes the tide to turn earlier 

 or the low water to come earlier. On the other hand, the upflow 

 into the river just before high water would occur neutralizes the 

 inflow from the bay and so causes high water to occur earlier. 

 Now if high water and low water were thus hastened equally, 

 there would be no change in the time from high water to low 

 water or from low water to high water. But since on the whole 

 there is a greater downflow from the river than upflow into it, 

 it is clear that the river must hasten low water in the harbour 

 more than it hastens high water. Hence we may conclude that 

 did the river not exist, the delay of low water in the harbour 

 would be slightly gieater than eight minutes. No doul)t part of 

 this delay must occur whilst the tide is passing from Mispec 

 Point inward. How much of it occurs during the passage of the 

 tide up the bay must remain an open question. 



IX. Results at otiiek Points on Riveh. 



The observations made at other points are given in 'J'ablc I V 

 and summarized in Table V. These tables show at Springhill, 

 Fredericton, Oromocto, Gagetown, Oak Point, Westfield and 

 Indiantown, (1) the mean spring-range (it being assumed that 

 the spring-range at St. John is twenty-seven feet); (2) how uukIi 

 later high water is at each point than at St, John; (3) how much 

 low watf'i- is delayed compai-cd with high water. The last 



