Salt Springs of Moutiers. 219 



Lake Michigan, from the northern to the southern extremity ; and 

 this too, while the duration and intensity of the wind remain the 

 same. At the head of the bay, the phenomenon will thus be exhib- 

 ited, of the recession of water in the face of a strong current of wind. 

 This occurrence has no doubt led to the opinion already referred 

 to, and the same appearances will be exhibited, though in a less 

 striking degree, upon the shores of all the lakes. A slight variation 

 in the force, or direction of the wind, will occasion a change in the 

 elevation of the water, seeking at all times to attain a level ; and 

 alternations of ebbing and flowing will thus be exhibited, aided no 

 doubt by the conformation of the coast, not easily reconcilable to the 

 .actual state of the wind. Very respectfully your obedient servant, 



L. Cass. 



Major Henky Whiting, U. S. A. 



Art. II. — A JYotice of the Salt Sp?'ings of Moutiers, in the Taren- 

 iaise, (Alps) and of a peculiar method of evaporation ; extracted 

 from the Travels ofK. Bakewell, Esq. : Vol. II. p. 220 : Lon- 

 don. 



Introductory Remarks. — By permission of the author, we insert 

 the following extract, presuming that the method of evaporation here 

 described may be advantageously adopted in this country, especially 

 in the case of springs whose impregnation is weak. We are aware 

 that methods, depending on the same principle, have been adopted 

 in this country, but we are not informed that any of them have been 

 permanently successful. 



The springs that supply the salt works at Moutiers, rise at the 

 bottom of a nearly perpendicular rock of hmestone, situated on the 

 south side of a deep valley or gorge, through which the Doron runs, 

 before it joins the Isere. The distance from the springs to the salt 

 works is about a mile ; the water runs in an open canal, made for 

 the purpose, but is received in a reservoir in its passage, where it 

 deposits part of its ocherous contents. Formerly the canal was con- 

 tinued to Conflans, a distance of sixteen miles, where part of the wa- 

 ter was evaporated. 



The water rises from the rock with considerable force, and emits 

 much gas, which is. principally carbonic acid, with a mixture of sul- 



