-W 



C 171 ] 



1,4304 at - 559 



1,4336 at - 5o« 



1,4357 at - 450 



hence nitrous acid, which at 60" is 1,4279, gains or lofes 0,00101 

 nearly by every degree between 60^ and 70^; and 0,00052 by 

 every degree between 45^ and 60*. 



I formerly found that the ftrongeft Jpirit of nitre i§ moft ex- 

 panded by heat or contradted by cold. 



Also, that nitrous acid, whofe fp. grav. at 34^ was 1,4750, 

 was expanded by heat as follows : 



1,4750 at 347 then it gains or lofes 0,0097 by 15* 

 became 1,4653 at 49 J between 34? and 49* inclufively. 



Again I found that colourlefs nitrous acid whofe fp. grav. was 



1,4650 at - 30® 



became - ^54587 at - 46'' 



1,4302 at - 86° 



hence by the firft 16^ from 30* to 46° it gained 0,0063, and by 



40°, that is from 46 to 86°, it gained 0,0285. 



Again, nitrous acid whofe dcnfity was 



1,2363 at- - 60° 

 became - 1,2320 at . - 70' 



1,2342 at - (i$^ 



Y 2 ,' 1,2384 



