78 BULLETIN OF THE NATURAL HISTORY SOCIETY. 



X. — Rate of Pro<;ress of High Water up River. 



To show the speed with which high water travels up river I 

 Lave plotted the results on cross section paper. Indiantown is 

 taken as origin or starting point. Times after high water at 

 Indiantown are represented by horizontal lines or abscissae, and 

 the distances which high water has progressed in those times 

 are represented 1)}'^ vertical lines or ordinates. The points on 

 this chart corresponding to the seven stations of observation are 

 joined b}'^ straight lines. The slope of this broken curve at any 

 point represents the speed of the high water at that point. 

 This shows at a glance that, whereas the speed is much less 

 between Oak Point and Oromocto than it is between Indiantown 

 and Oak Point, it increases again between Oromocto and Kings- 

 ■cleai-. In fact the average speed of high water is : 



Between Indiantown and Oak Point — 20 miles an hour. 

 " Oak Point and Gagetown — 9i " " 



" Gagetown and Springhill — IH " " 



It is interesting to compare this with the fact, stated in the 

 preceding section, that the delay of low water is greatest between 

 Indiantown and Oak Point, and between Oromocto and Springhill, 

 but is at least very small between Oak Point and Oromocto. Again 

 both of these statements seem cojinected with the fact noted 

 ■earlier that it is between Oak Point and Oromocto that islands 

 are numerous and greatly interrupt the course of the river. 

 Hence we seem justified in concluding that irregularities and 

 obstacles in a river retard the progress of high water, but do 

 not delay low water as compared with high water. 



I have also plotted a curve representing how the amount of 

 tide from point to point of the river varies with the distance 

 from Indiantown. Excepting the highest point, Springhill, the 

 points lie roughly on an exponential curve, indicating that each 

 mile pi'oduces roughly the same percentage decrease of tidal rise. 

 This wt)u]d seem almost obvious beforehand, and need haj-dly be 

 discussed further. 



