Diagram representing Che abnormal oscillations of'the barometric column 
iTole. The stars mark points p Lotted from observations. The abscissa* denote times of observations as indicated at the heads of the columns. The ordinates show the true rise or fall of 
the barometric column, between these times for example-, a difference of one tenth of an, inch between any two ordinates shows that the two readings of the barometric 
column at the correspoTiding times differed, one tenth of an inch . 
