On artificial Carlonate of Lime. 1 17 



. It is reasonable to infer, if the colouring matter of 

 the blood were Lonst.tuted bv iron in any siate^ot co.n- 

 binalinn, that a larger relative proportion of that metal 

 would have been discoverable in the tormer than in the 

 latter ruaeulu"» i but trequeiu repetitions ot these experi- 

 ments have shown that tlu* is not the case, and the iollowing 

 result appears to comi)lete the evidence on ihis subject. 



The colouring matrer of a pint of blond was diffused by 

 agitation ihrou^h the serum, trom which it was allowed 

 gradually to subside, the coagulum having been removed : 

 after twenty-four hours, the dear SL.um was decanted ott, 

 and the remauider, containing the colouring matter, atter 

 bavine beeu evaporated to dryness, was incinerated, ana 

 the ash examined as in former experiments. But the 

 traces of iron were here as indistinct as in the other in- 

 stances above mentioned, although a considerable quantity 

 of the colouring matter had been employed. 



The minut.s of analvMS I have purposely excluded, as 

 leadin>r into details which would exceed the proper limits 

 of this^'papcr, and unnecessarv in the present investigation. 

 I shall now merely dwell on the principal results which 

 have bee., obtained, and on the general conclusions which 

 these afford. 



[To be continued J 



XX 1 1 An Attempt to determine the relative Quantities of 

 ttie comtituent Parts of artificial Carbonate oj Lime, By 

 M. J Bekzelius. 

 BuCHOLZ found that several fossil carbonates of lime, a8 

 calcareous spar, c:ialk, &c. contained 56;- parts of lime, 43 

 pans carbonic acid, half part water*. But Klaproth says, 

 that b..th the nalur.:l and artificial carbonates ot lime con- 

 sist of 45 parts carbonic acid and 55 parts lunef, tram 

 which the latter in several of his analyses calculates th* 

 quautitv of lime in calcaieous carb^onates. 



'ihouob I had no reason to question the correctness ot 

 Buch<,lz's account, it occurred to me that the artihcial car- 

 bonate of lime (of which he had not communicated anv se- 

 parate examination) might p-.^sibly approxmiate the state- 

 inent ot Klaproth ; and as it was re<,uisite that I should 

 know this to a certaiiuv, for the sake of several other aua- 

 lyiical experiments, I determined to investigate the com- 

 position of this compound with the utmost exactness. 



* NninAln'm.J.mrmdilnChemU. vol iv. page 410. 

 I Kla^TMltt Bt^iag^, vol iv. page 210. 



