292 PROFESSOR WILLIAM THOMSON ON THE 






Col. 1. Col. 2. Col. 3. Col. 4. 
Meus BE aeeO Le, Values of » according Seas eee 
Temperatare of soeueted steam, [¢2 YOU'S formula, | tion for density of 
BE 17176 
: I] Tipe isons * 4] 
0 4-967 5:087 50388 
10 "4-832 4-908 4-901 
20 4-703 4-740 4:769 
30 4:578 4-584 4-643 
40 4-456 4-438 4-519 
50 4:337 4°300 4:399 
60 4-221 4171 4-281 
70 4114 4:050 4:172 
80 4013 3°935 4-070 
90 3921 3°827 3°977 
100 3°833 3°724 3-887 
110 3°753 3:627 3°806 
120 3679 3°535 3°731 
130 3611 3:°447 3°662 
140 3°546 3°364 3596 
150 3°487 3°284 3536 
160 3432 3°209 3°481 
170 3°382 3°136 3°430 
180 3°339 3-067 3°382 
190 3°289 3-001 3336 
200 3:247 2-937 3293 
210 3208 2876 3:254 
220 3171 2-818 3216 
230 3135 2-762 3°179 

Mr Joutz, when I pointed out these discrepancies to him in the year 1848, 
suggested that even between 0° and 100°, the inaccuracy of the data regarding 
steam might be sufficient to account for them. I think it will be generally ad- 
mitted that there can be no such inaccuracy in ReGnavtt’s part of the data, and 
there remains only the uncertainty regarding the density of saturated steam, to 
prevent the conclusion that . cannot be expressed by J ts so that Mayer’s 
hypothesis would be confirmed if, and overturned unless, the density of saturated 
steam, instead of following the gaseous laws, were truly expressed by the equations 
1 
( + ‘) [H] 
Care ire uhnxiko ean lan 
De ge 1100. oo 
(el=1¢935 °° —14Er nt 
where [2] denotes the quantity tabulated for the temperatures 0°, 1°, 2°, . . . 230° 
in Table I. of my Account of Carnor’s Theory; and [a] denotes the density of sa- 

turated steam which was assumed in the calculation of that Table, the values of £ 

