Miscellaneous Intelligence. 423 
ience. The mivered balls I have Siieico vary from 4 inch to 2 
inches in diamete: 
own. 
PeIee he when the mirror, —_ or concave, is rapidly turned. I 
am not aware that the significance of this fact has attracted atten- 
tion. Does it not indicate that the flame both eet and loses 
its light progressively from base to summit, the loss being more 
rapid than the recovery; and that at no single instant of its ere. 
is the soundin as such in size and form, as it snpeaes to 
when steadily viewed? Moreover, if the flame, in an 
rekindled from above as it must be, if it is ever absolutely extin- 
guished while sounding, it would seem that its image on its first 
Ppa at least should be tilted in a direction opposite to the motion of 
t 
I halle conclude these notices by stating a fact Dearing upon the 
theory of these flames. I have found no difficulty in causing the 
flame to sing when — quietly into a horizontal eee 
leveled, f and diameters were used. 
narrow horizontal Paro the vibrations are soon arrested by the 
accumulating products of combustion. In a tube 13 inches in 
diam. and 3 feet long, the flame sang for an indefinite time. While 
it was sounding, no drifting of smoke previously sakatdesad into 
the tube, or ee . column 3 smoke mm the past its t end, 
pass from ; . 
= "that the latter is in 
position. 
4. On a convenient form of Aspirator + by Prof. Arzerr R. 
il co 
these feet in — is connected to ¢ off the w cet 
placed on the floor below. When the bucket is filled, the stop- 
cock is turned off for a moment, and the water po ba 
the pail, To the top of the stop-eock tube, whic shoulthe —— 
* This Journal, vol. xxvi, p. 10. 
