114 Scientific Intelligence. 
0°031800, and by means of Cauchy’ s formula for reflection from metals 
0-021720, while by Brewster’s formula 039740 was obtained. In this 
manner he determines the equivalent for quite a alae of elements. 
For easier comparison the refraction mei are referred to that of 
hydrogen as unity. These values he marks [JV], hence for reduction 
IMI(H) : [IME (HH) =o" 004050 : 1 00. _ 
urther he deduces from these latter values the optical atomic numa 
aabi of hydrogen being 100, by the equation 
ons 
We condense Schrauf’s tables into the following, giving the values of 
the atomic weight P.(H=1), the ei oman ghey [IVE] (also for 
H=1) and the optical atomic number ZG (that of H equal to 100). ee i 
last. two bia to the red rays. The Sects solid-liquid and_ gaseo 
states are indicated respectively by m, f (fest-flitssig) and g.* é 
Z@ P [mt] 2G 
Hydrogen 1 g 100 10000} Na 220 ff «868 (1596. 
Al 274 =f B19 2114} P 31 ‘51 
120 m 569 62:99 
15 g 405 523} Hg 200 
1.1800. 300 
pe eT SF ee a 
Be 94 f 401 4266| O 16 
Pb 208 f - 2702 12°99 8 32 
m 8860 4260 
Bo 20 Cf = 918 aN Be 19°5 
Br 80 f 1076 1845) Ag .. 108 
Ca o.- <7 8 16 65 
Cd 112 f 1161 1088] Si 28 
Cl 855 ~g G6I 1658 H 
Fe 56 m 8356 5100| N 4 
F me 4 763| Sr 87°6 
I 127 =f 1905 1500! Ti 6 
K 392 fF 40498 ~=—«12-06| Bi 210 
Meoa sy 601 41°98 
Cu 634 f 960 1515| W 184 
: m 1783 27-05} Zo 65:2 
Li TF S46. «4800 
Mg . f Tia 3225) Sn 118 
Mo tf 4878 60%6| Z 448 
rir tis table Schrauf deduces further that the various conditions of of 
the same elements are optically expressed in simple multiples. 
a as solid we have 16-13, which “ys 4 times 4°03, almost viention! sith 
4 for sulphur vapor. ’Also that. allied elements are optically in the 
noah relation of simple multiples; thus the last colum bigio : 
F — Uh 13°45 (f), 1 15-00 (7); Cl 15°53, g. 
@ 12-259; § 12-00 (9) ), Se (m) 37°77; B(f) 50-40; 
so also N, ie P, Sb, Br, and other groups. . 
_ Though many points are yet obscure, we nevertherless hail this 
vestigation of Schrauf as a decided progress. — -Ber.. Ak. Wien, li, 1 
211, 1865; Pogg. Ann., exxvii, peleee 8 1868, cent G. He 
