216 Scientific Intelligence. 
enlarged at one point so that it may be attached to the reservoir 
y gutta percha passing through a copper orifice. The latter is 
then closed by a sc i 
a Se, 
for abscissas the pressures and for ordinates the volumes of the 
i 
| 
exercised upon its walls. In fact this should be so, for if we take 
peizometer, the compressibility of the glass being very small this 
u 
i 
which he has recently made on the periodic waves which take 
Seiches 
Dr. 
been found to be as much as r oO meter . : 
one or tw finds that 1 
s. 
studied this phenomenon in nine different lakes, and 
on the Lake of Geneva, but that of Neuchatel was peger ms 
best fitted for the study of the subject, possessing as It loyed 
extremely regular-geometric form. The apparatus he apable of : 
had passed and five minutes before its arrival, and was a 
structed as to eliminate the effect of common waves, sof the 
register the motion side by side with a record of the ee found 
barometer, on paper kept in continuous motion. While : yenty 
the duration of waves to be ten minutes at Monges it was 8¢ 
