I io 3 1 



congelations, and are wafhed away by frefh water, applied as 

 above-mentioned. Hence we learn that fea-water may be frefh- 

 ened by freezing, provided the brine enveloped between the 

 laminae of its ice be wafhed away. And in cold countries fait 

 might be prepared from fea-water at a very moderate expence; 

 for by freezing fhallow ponds of this water, by turning the ice to 

 drain off the brine, and when the brine is reduced to a twentieth 

 part or lefs by evaporation, very little evaporation and fuel will 

 be neceffary towards the formation of the fait x . But all the fait 

 of the fea-water employed will not be obtained, becaufe the 

 greater part of it will be retained between the lamina? of the 

 ice, which muft be rejected; and the concentration by freezing 

 cannot be advantageoufly carried further than is above expreffed, 

 becaufe at that degree of concentration the cold, and the time 

 neceffary to caufe further congelations, muft be very considerable, 

 as will the wafte of fait likewife, fince the ice is then ftrongly 

 faline. 



* A fmall portion of the ice, taken at various times from B 

 fince the 26th of January, was not wafhed, but only left to drain 

 in a funnel ; and each portion thus drained during five or fix 

 days, being feparately diflblved, tafted ftrongly of fait, although 

 the like ice, which was bruifed and wafhed, yielded frefh water. 

 This proves that warning removes the intercepted brine ; and 

 that this brine does not feparate by draining. 



44 January the 20th, at eight o'clock in the evening, the 

 Thermometer pointing at twenty-three, in the open air where 

 the Thermometer flood, I mixed mow with fmoaking fpirit of 

 nitre, and placed in the mixture a glafs half-pint tumbler full of 

 fea-water; and at the fame time placed the Thermometer in the 



y. u Wallerius fays, this art is praftifed in the Northern countries." 



mixture. 



