Effects of lit-at modified ly Compression. 



211 



Talle of Specific Gravities. 



Explanation. 



Column I. contains tbe number affixed to each of the 

 specimens whose properties arc expressed in the table. 



The first eleven are the same with those used in the paper 

 read in this society on the 30th of August 1 804, and pub- 

 lished in Nicholson's Journal for October following, and 

 which refer lo the same specimens. No. 12. is a specimen 

 of yellow marble, bearing a strong resemblance to No. 3. 

 No. 13. a specimen of chalk. No. 14. shows the average 

 of three trials with chalk. No. 15. some pounded chalk, 

 rammed in the manner followed in these experiments. In 

 order to ascertain its specific gravity, I rammed the powder 

 into a glass tube, previously weighed; then, after weighing 

 the whole, I removed the chalk, and filled the same lube 

 () S will) 



