i Continuation of the Experiments and Obfervatiom 
I afterwards tried another, and fomewhat ffronger, fpirit of 
nitre, whofe fpecifc gravity was 
Deg. 
Sp. gravity 
' 34 
>>475° 
at * 
49 
1,46-3 
> 
-• 
115 ° 
" 1,3792 
Here alfo the expanfions are nearly proportional to the degrees 
of heat ; for 1 16° of heat (the difference between 3+ and 1 50), 
produce an expanfion of 00958; and if of heat (the dif- 
ference between 34 and 49) produce an expanfion of 0,0097*. 
and by calculation 0,0123, which lad: differs from the truth 
onlyby^W 
By this experiment we fee, that the ftronger the fpirit of 
nitre is, the more it is expanded by the fame degree of heat 
for if the fpirit of nitre of the laft experiment were expanded 
in the fame proportion as in the firff, its dilatation by u 6° of 
heat fhould be 0,0679, whereas it was found to be 0,0958. 
As the dilatation of fpirit of nitre is fir greater than that of 
water by the fame degree of heat, and as it coniifts only of 
acid and water , it clearly follows, that its fuperior dilatability 
muf be owing to the acid part ; and hence, the more acid is 
contained in a given quantity of fpirit of nitre, the greater is 
its dilatability. We might therefore fuppofe, that the dilata- 
tion of fpirit of nitre was intermediate betwixt that ot the 
quantity of water it contains and that of its quantity of acid ; 
buL there exifts another power alfo which prevents tfrisfmple 
refultj namely the mutual attraction of the acid and water to 
each other, ^ which makes them occupy a lefs, fpace than the 
luin of their joint volumes, which condenfation 1 have there- 
* ore ca ^ed their accrued denfty. Taking this into' the account, 
% 
vve 
