Physics and Chemistry. 217 
08:3. Iron, double. 71-2 Iron. 
es 5 Be. 9 62°4 Calcium, double. 
 F 1797-27 Hydrogen. _ 32°0 Iron, double. 
| ff 1632:2 Iron. h 15°9 No metallic line. 
28: 05°3 Iron, strong. 
90:4. “ * 02:0 “ 
04:3 Hydrogen. 14952“ 
1598-8 Iron. 80°4 Strong, no correspond- 
: @ 1592°34 Iron. ing metallic line. 
ig Bae A 67:2 Calcium 
ead H 54°0 + 
Pie, ge rn kt Fc Re a eS ere ye adh SA a ms ae 
ands, and consequently, in observing with the telescope, an aberration 
_ Must ensue proportional to the relation between the motion of the tele- 
Scope perpendicular to its axis and the velocity of the light in the direc- 
of the axis. The results obtained in testing this method appear to 
confirm the correctness of the theory, but are not sufficiently numerous 
to be decisive. The author proposes to resume the subject under more 
favorable circumstances of weather.—Po ig. Ann., cxxiii, 489. W. G. 
[Note—The annexed table of wave-lengths, taken in connection with 
g. 
=e 
i, the exact knowledge which we have at present of the subject. The 
Witis here the sy,5c5,g05 of a millimeter.  * 
Wave-lengths, ~ Wave-lengths, 
= 7680 Mascart. 18. «’ Hg 5759 Pliicker. 
6897 Fraunhofer.19. 7CO,) 5599 % 
6763 Miller. 20. ems 5584 
“ce 
6610 . BHg £401. 
6559 Fraunhofer,22. «Cl 5451 . 
6533 i 23. I 5337 ts 
6493 . OSnCl, 5333 = 
6445 “ 25. O 28 = 
6329 “ 26. E 5265 Fraunhofer. 
6150 ng jet BO 5216 Plicker. 
6089 % a6. 900, bie -* 
6024 28b, yO 5185 
5978 “ oo abr, => 5168 ' 
5947 ts so, #1 5167 
5888 jai]. ySiCl, 5050 “ 
s eae 32. : . 4856 Fraunhofer. 
74 33 iic 
5762 “ 34. 6Br 4793 
ne) 
Angstrém, will present to the reader, it is believed, ail, or almost 
