DIURNAL VARIATION OF THE BAROMETER. 
69 
The interesting nature of these matters justifies an earnest 
recommendation that the tidal harmonic analysis be applied 
to the variations of the barometer and the fluctuations of the 
terrestrial magnetic elements. Should the tidal harmonic 
components be found in the barometric and magnetic varia¬ 
tions a most important step will have been taken in the 
explanation and coordination of natural phenomena and an 
enchanting field of research will open before us. 
