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From fome Obfervatiotis on the Tides in Orkney , 
I incline to think the Water begins to rife and fall 
fooner near the Shore than at a Diftance from it. 
When Spring-Tide is at its greateft Altitude, or 
Deprcfllon, the Water conrinues in a quiefeent State 
near half an Hour : Neap-Tides continue lo about an 
Hour and a half. 
The Motion of the Water, both in Afcent, De- 
feent, and Progrellton, is accelerated from the fiift 
to the fourth Hour, commonly} from the fourth to 
the lart Hour its Velocity diminifhes. This, however, 
admits of fome Variation from the Influence of 
Winds. 
The greateft Spring-Tides, and leaft Neap Tides, 
are commonly on the third or fourth Day, atrer tnc 
Syzygies and Quadratures } but in this alfo the Winds 
have a conftderable Influence} Weft and South weft 
Winds making the greateft Floods, and leaft Ebbs ; 
North and North-eaft Winds, on the contrary, making 
the greateft Ebbs and leaft Floods in Orkney , and on 
the North Coaft of Scotland. When Flood Tide is 
raifed higher than ordinary by Winds, the l'ubfequcnt 
Ebb is not lo low as it would have other wile ben. 
When a high Flood is raifed by the Moon, the l'uc- 
ceeding Ebb is proportionally low. 
Ordinary Spring Tides rile 8 Feet perpendicular, 
ordinary Neap I ides 34* extraordinary high Spring- 
Tides life 14 Feet} extraordinary low, only 5} extra- 
ordinary high Neap-Tides rife above 6 Feet} extra- 
ordinary fmail Neap Tides not above 2. Low-water 
Neap Tide, at a mean, I judge is about 3 Feet above 
Low-water Spring Tide, and High-water Spring-Tide 
about 3 Feet above High-water Neap-Tide : Yet the 
Rife 
