[ 35° ] 



IV. An Analyjis of the Waters of two Mineral Springs di 

 JLemington Priors, near Warwick ; including Experiments 

 tending to elucidate the Origin of the Muriatic Acid. By 

 WILLIAM Lamb> , M. A. late Fellow of St. John's Col- 

 lege, Cambridge. From the Memoirs of the Literary and 

 Philofophical Society of Manchefter, VoV. V. Fart I. 



[Concluded from p. 269.] 



XI. FURTHER PROPERTIES OF THE OXYGENATED 

 MURIAT OF IRON. 



JL H E fafts T have related are unquestionable t it was in 

 the latter end of 1795 that I firft made the obfervation on the 

 effecl: of hepatifed water upon iron : fince then I have veri- 

 fied it repeatedly, and particularly in the month of Decem- 

 ber 1796, with fome very pure iron, and in the prefence of 

 two gentlemen, very competent judges, one of whom affifted 

 at every part of the procefs. Still it has been afked, How is 

 it poflible that this folution can contain muriatic acid, feeing 

 that nitrat of filver, that moft delicate teft of this acid, is 

 hardly affected by it ? To this it might perhaps be a fumcient 

 reply, that it is unreafonable to oppofe a mere analogy to 

 the direct evidence of the fenfes ; particularly in a new cafe, 

 where we have found fome of the analogies beft eftablifhed in 

 chemillry to fail. But let us recur once more to experiment. 

 I formed again fome oxygenated muriat of iron. I fuffered 

 the acid to remain on the oxyde about 24 hours ; then poured 

 off the liquor, and evaporated the fait to drynefsto expell the 

 fuperfluous acid: the fait, which deliquefees inftantly on 

 cooling, was re-diffolved inalittlediftilled water. 1. I tried 

 the folution with the acetite of lead : not the fmalleft cloud 

 Xvas produced. 2. The folution was then tried with tha- 

 nitrat of filver: a little white curdy matter was formed. 

 3. A tea-fpoonful of the fohition was diffufed through two or 

 three ounces of diftilled water, and then tried with the nitrat 

 of filver: a very flight cloud was formed, and a minute purple 

 precipitate fell, but not till after fome hours. The appear- 

 ance 



