516 [Sept. 20, 
Chase. ] 
of the falls, there were no less than one hundred of these 
streams, and on sounding the required note the groupings 
of the drops and the positions of the ventral segments in- 
stantly altered in quite a marvellous manner. This case of 
acoustic sensitiveness is one of the most extensive I have 
ever noticed. 
A. second fall was found that would respond to certain 
notes, though it was not equal to the first in sensitiveness. 
Though not able, from a sudden flooding of the streams, 
to discover the exact conditions for success, I believe the 
explanation of the phenomenon to be the same as that now 
generally given for sensitive smoke and water jets, viz: that 
the sound pulses produce a vibration of the orifice of the jet, 
by which the constitution of its issuing stream is altered. 
The orifice in the case is replaced by the thin moss filaments, 
which are surrounded by the stream instead of surrounding 
it. rom their shape and position their filaments, acting as 
reeds, readily accept the motion of the sound waves and so 
alter the constitution of the vein.” 
Prof. Chase communicated observations on Daily Auroral 
and Meteoric Means, and on some new correlations of stellar 
and Planetary distances. 
Mr. Lesley described a newly observed terminal moraine 
crossing the Walkill Valley at Ogdensburg near Franklin, 
Essex county, New Jersey. 
Pending nominations, Nos. 697 to 701 and new nomina- 
tion No. 702 were read. 
The meeting was then adjourned. 
DAILY AURORAL AND METEORIC MEANS. 
By Purny Earur Case. 
(Read before the American Philosophical Society, Sept. 20, 1872.) 
The apparent influence of meteoric falls upon auroras, which is indi- 
cated by the five-day means, (ante p. 402), renders more minute observa- 
tions desirable, in order to ascertain to what extent a similar influence 
may be traceable in the daily means. 
The only available observations that have fallen under my notice, 
from which any satisfactory approximation can be made to the daily 
meteoric curve, are embodied in Baumhauer’s table of the recurrences of 
meteoric stones and fire-balls, quoted by Lovering, (‘‘on the Periodicity 
