J^ P P E N D I X. 



Specific Gravity of Ice, tried by Dr. Irving. 



A piece of the moft denfe ice he could find, being im- 

 -merfed in fnow water, thermometer thirty-four degrees, — 

 fourteen fifteenth parts funk under the furface of the 

 .water. 



In brandy juft proof, it barely floated : in reSified 

 ipirits of wine it fell to the bottom at once, and diflblved 

 immediately. 



September the fourth, at two in the afternoon, we founded 

 with all the lines, above eight hundred fathom. Some 

 time before the laft line was out, we perceived a flack, 

 and that it did not run off near fo quick ast>efore. When 

 we got the lines in again, the firfl: coil came in very eafily, 

 and twenty fathom of the next, after which it took a 

 great ftrain to move the lead ; a mark was put on at the 

 place where the weight was perceived, and the line 

 meafured, by which the depth was found to be fix hun~ 

 dred and eighty-three fathoms. The lead weighed above 

 one hundred and fifty pounds, and had funk, as appeared 

 by the line, near ten feet into the ground, which was 

 a very fine blue foft clay. A bottle fitted properly by 



y Dx, 



141 



