2 1 8 Analyfis of the Air. 



Jth Of a cubick inch of filings of Iron, 

 and a cubick inch of Limon juice, abforbed 

 two cubick inches of air. 



It is remarkable, that the fame mixtures 

 fhould change from generating to abiorbing, 

 and from abforbing to generating dates 5 

 fomctimcs with, and fometimes without any 

 fenfible alteration of the temperature of the 

 air. 



Experiment XCV. 



Half a cubick inch of fpirits of Harts- 

 horn, with filings of Iron abforbed 1 -\- 4 

 cubick inches of air, with filings of Copper 

 double that quantity of air, and made a 

 very deep blue tin&ure, which it retained 

 long, when expofed to the open air. It was 

 the fame with fpirit of Sal Ammoniac, and 

 filings of Copper. 



A quarter of a cubick inch of filings of 

 Iron, with a cubick inch of powdered Brim- 

 fione, made into a pafte with a little water, 

 abforbed 19 cubick inches of air in two days. 

 N. B. I poured hot water into the ciftern x x 3 

 £Fig. 34.) to promote the ferment, 



A like 



