30 



PROFESSOR FORBES'S EXPERIMENTS ON 



larly distributed. They may, however, be considered as composing two groups, 

 one of which includes a number of the leading towns in Germany, thus checking 

 former and somewhat discordant observations ; and the other, as extending in 

 some measure my former investigations as to the isodynamic lines of the middle 

 or Swiss Alps, to the eastern part of that range. 



62. I commence with the Intensity Observations : 



TABLE I. 



