248 
But it may be fairly asked, whether any similar relations exist 
between the specific gravities and atomic weights of the remaining 
solid or liquid non-metallic elements. I take the following mean 
specific gravity for bromine, iodine, sulphur, and selenium, and omit 
the only two remaining elements — phosphorus and tellurium — from 
the list, because they do not appear to yield relations at all analo- 
gous to those under consideration : — 
r 2*966 
Balard. 
Bromine, sp. gr., 
. ) 2-980 
l 2-990 
Lowig. 
jj 
Mean, 
2-979 
Iodine . — There is only one recorded specific gravity of this ele- 
ment — viz., that by Gay Lussac. I have estimated the specific 
gravity of two fine specimens in my laboratory, and take the mean 
these results : — - 
4-948 
Gay Lussac. 
5-030 
Playfair. 
Mean, 
4-989 
Sulphur, sp. gr., 
. 
= 2 0 
Selenium, 
4*30 
Berzelius. 
4-32 
3 3 
4-31 
)) 
Mean, 
4-31 
Tabulating these results, and bringing into comparison with them 
the roots of the atomic weights, we have the following striking ac- 
cordances : — 
Sp. gr. 
Equivt. 
Roots. 
Boron, 
2-68 
V 
7-2 
= 2-68 
Silicon 
2-46 
V 
14-2 
= 2-42 
Bromine, 
2-98 
V 
80-0 
= 2-99 
Iodine, 
4-99 
4/1270 
= 5-02 
Sulphur, 
2-00 
V 
16-0 
= 2-00 
Selenium, 
4-31 
Se\/ 
80-0 
= 4-31 
