Chemistry and Physics. 219 
The methods of measuring the parallax of the sun may be di- 
value of the herrea of oo bora et Bs the epg here ob- 
t 
tions with théorental laws based on the theory of oriviiation 
They give the value 8°86. 38d. The purely geometrical methods 
by the parallax of the planets near the earth. The opposition of 
Mars in 1862 gave 8°84. But the greatest segs is attained 
y the observations of the transit of Venus.— Comp sh iat 
lxxix, 1361, Be 
12. On a new way 4 illustrating the Vibrations ef the dir in 
Organ Pipes ; by Prof. Josern Lovurtne, of Cambridge, Mass. 
(From the Proceedings of the American Association for the Ad- 
vancement of Science, vol. xxiii. ate shall begin with a brief 
description of the methods adopted by W. B. Rogers and Kenig 
for making visible the vibrations of the invisible air in organ pipes. 
By the first method two gas burners were fed from a common 
pe aptiaes a glass tube was placed over one burner and the length 
the flame altered until it was brought into unison with the 
spaces as soon as the sound was heard. The method has the ad- 
vantage of giving an object which be seen in all directions, 
with the disadvantage, however, on account of the small circle in 
which the flame travels, of crowding upon each other the alternate 
dark and bright spaces ‘of the fluted surface. 
The description just given has reference to the a con- 
structed de Mt cenig under the name of the Appareil d flammes 
The second ethiod ‘for ee the same object is a device 
cS Keenig, and is known the name of the Manometric 
lames. ing i i 
* Amer. Journ. ca xxvi, 1858. + Ann. Chem. und Phys., cxxii. 
