File:Studies of nature (Volume 1) (1808) (14596365247).jpg

Identifier: 0220231X1.nlm.nih.gov
Title: Studies of nature (Volume 1)
Year: 1808 (1800s)
Authors: Saint-Pierre, Bernardin de, 1737-1814 Saint-Pierre, Bernardin de, 1737-1814. Paul et Virginie. English Saint-Pierre, Bernardin de, 1737-1814. Arcadie. English Barton, Benjamin Smith, 1766-1815 Hunter, Henry, 1741-1802, translator Lawson, Alexander, 1773-1846, engraver Small, Abraham, 1764?-1829, printer Birch and Small, publisher
Subjects: Nature
Publisher: Philadelphia : Printed by Abraham Small, for Birch & Small, M. Carey, C. & A. Conrad & Co., W. W. Woodward, Jacob Johnson, and Kimber and COnrad, in Philadelphia Thomas and Andrews, Boston Campbell and Mitchell, New-York and Backus and Whiting, Albany
Contributing Library: U.S. National Library of Medicine
Digitizing Sponsor: Open Knowledge Commons, U.S. National Library of Medicine

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e causes: but I proceed to repairwhat I have been pulling down by other observations; andto demonstrate that there is no one Tide on any coast what-ever but what owes its origin to polar effusions. An observation oi Dampiers* will serve at first as a basis tomy reasonings. That careful and ingenious observer distin-guishes between Currents and Tides. He lays it down as aprinciple founded on many experiments, of which he givesthe history, that Currents are scarcely ever felt but at Sea, andTides upon the Coasts. This being laid down : the polar effu-sions, which are the Tides of the North and of the East tothose who are in the vicinity of the Poles, or of bays whichhave a communication with it, take their general course to themiddle of the channel of the Atlantic Ocean, attracted towardthe Line by the diminution of the waters which the Sun isthere incessantly evaporating. They produce by their general * See Dampiera Treatise on Winds and Tides. IM.ATK II. Atla?^tic hemisphere. TsrORTII
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■ •^TF^UHni (-/v/X-.p/mT;//>/#■>-A /^,,/^ J( ^.V O/. /.ll ovW- . \0 STUDY IV. 105 Current two contrary Currents or collateral Whirlpools similarto those which rivers produce on their banks. I am not taking for granted withouVany foundation the ex-istence of these counter-cuwents or vortices, after the mannerof System-makers, who create new causes in proportion asNature presents them with new effects. These vortices arehydraulic re-actions, the laws of which Geometry explains,and the reality of which is completely ascertained by experience.If you look at a small running brook, you will frequently seestraws floating along the brink, and carried upward in a di-rection opposite to the general cuiTent of the stream ; and onarriving at the points where the counter-currents cross the ge-neral, you observe them agitated by these two opposed pow-ers turning and spinning round a considerable time, till theyare at last carried down the general current. These counter-currents are stil

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