MUTUAI. DBCOMPOSIT!ON. 
Lin. is said to afford. The inspissation or evaporation of this 
being, doubtless, performed also in iron vessels ; though Crell 
has supposed, that the juice of this tree natnrally contains iron ; 
but certainly it cannot contain it in any proportion sufficient to 
produce such an effect. 
II. 
Inquiries concerning the mutual Decomposition of spLuhie and 
insoluble Salts. By M. Duluno. 
{Continued from p. 280.) 
T he carbonates of strontian and of lead present an apparent Mnfu.il de- 
anomaly with the sulphates of potash and soda. For if a great 
excess be used of either of these soluble salts, but a very small ble neutral 
quantity of the in.solubIe sulphate is formed. The liquid, ’ 
when filtered, after the operation, is only, in a slight degree, 
alkaline, and does not contain any carbonic acid. The same 
thing occurs with strontian, as the sulphate of that base is 
evidently more soluble than the carbonate, so that when the 
caibonic acid can no longer pass through the liquid without 
being absorbed, all ulterior decomposition becomes impossible, 
for the sulphate of strontian which would be formed, will be 
immediately decomposed by the carbonate of potash contained 
in the fluid. 
The c.arbonate of lead comports itself in the same manner 
as the preceding, though the insolubility of the sulphate and 
carbonate of lead, consid?;ed with regard to water, are sensibly 
the same. M. Berthollet has already remarked, that the sul- 
phate of lead is more soluble than the muriate of the same 
metal in an alkaline solution*, and I have perceived, that there 
is a still more considerable difference between the solubility of 
the sulphate and carbonate under the same circumstances. 
* Mem. de I'lnstitat, tom. HI, p. SSI. 
When, 
