PHYSICAL AND LITERARY. 15 



pitation of a whitifli powder. More of 

 the alkaline foludon was then added 5 

 and as a new la(5\efcency and precipita- 

 tion enfued, the addition was from time 

 to time repeated, till it produced do lucU 

 efFedl. Then it was evident, that what- 

 ever the acid had carried ofF from the 

 made, was now thrown to the bottom. 

 The precipitated powder, when fepara- 

 ted by filtration, waftied, and diTcid, 

 weighed precifely 42 grains ; which, ad- 

 ded to the i8 grains of unfohible mat- 

 ter in Experiment 3. makes up the ori- 

 ginal weight of the marie employed 

 in that experiment. This powder was 

 altogether inlipid ; fuffered no change 

 from water ; and was, after a very brifli 

 effervefcence, totally difTolved both by the 

 acid of nitre and of iea fait. 



The liquors filtered off from the un- 

 foluble matters in all the experiments re- 

 lated in Secflion 3* were feparately treat- 

 ed in the manner defcribed above, and 

 in every refpect with the fame appear- 

 ances : Particularly, the weight of each 

 of the precipitated pow-ders, added to 



